MAX5406_V01 [MAXIM]
Audio Processor with Pushbutton Interface;
| 型号： | MAX5406_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Audio Processor with Pushbutton Interface |
| 文件： | 总25页 (文件大小：2103K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX5406
Audio Processor with Pushbutton Interface
General Description
Features
The MAX5406 stereo audio processor provides a com-
plete audio solution with volume, balance, bass, and tre-
ble controls. It features dual 32-tap logarithmic potentiom-
eters for volume control, dual potentiometers for balance
control, and linear digital potentiometers for tone control.
A simple debounced pushbutton interface controls all
functions. The MAX5406 advances the wiper setting
once per button push. Maxim’s proprietary SmartWiperTM
control eliminates the need for a microcontroller (µC) to
increase the wiper transition rate. Holding the control
input low for more than 1s advances the wiper at a rate
of 4Hz for 4s and 16Hz thereafter. An integrated click/pop
suppression feature eliminates the audible noise gener-
ated by the wiper’s movements.
● Audio Processor Including All Op Amps and Pots
for Volume, Balance, Mute, Bass, Treble, Ambience,
Pseudostereo, and Subwoofer
● 32-Tap Volume Control (2dB Steps)
● Small, 7mm x 7mm, 48-Pin TQFN and 48-Pin
TSSOP Packages
● Single +2.7V to +5.5V or Dual ±2.7V Supply
Operation
● Clickless Switching and Control
● Mute Function to < -90dB (typ)
● Channel Isolation > -70dB (typ)
● Two Sets of Single-Ended or Differential Stereo
Inputs Can Be Used for Summing/Mixing
The MAX5406 provides a subwoofer output that internally
combines the left and right channels. An external filter
capacitor allows for a customized cut-off frequency for the
subwoofer output. A bass-boost mode enhances the low-
frequency response of the left and right channels. An inte-
● Debounced Pushbutton Interface Works with
Momentary Contact Switches or Microprocessors
(µPs)
● Low 0.2µA (typ) Shutdown Supply Current
● Shutdown Stores All Control Settings
grated bias amplifier generates the required (V
+ V )/2
DD
SS
bias voltage, eliminating the need for external op amps for
unipolar operation.
● 0.02% (typ) THD into 10kΩ Load, 25µV
(typ)
RMS
Output Noise
The MAX5406 also features ambience control to enhance
the separation of the left- and right-channel outputs for
headphones and desktop speakers systems, and a pseu-
dostereo feature that approximates stereo sound from a
monophonic signal.
● Internally Generated 1/2 Full-Scale Bias Voltage for
Single-Ended Applications
● Power-On Volume Setting to -20dB
● Internal Passive RF Filters for Analog Inputs Prevent
The MAX5406 is available in a 7mm x 7mm, 48-pin TQFN
package and in a 48-pin TSSOP package and is specified
over the extended (-40°C to +85°C) temperature range.
High Frequencies from Reaching the Speakers
Ordering Information
Applications
● Desktop Speakers
PIN-
PACKAGE
PKG
CODE
PART
TEMP RANGE
● Portable Audio
● PDAs or MP3 Player Docking Stations
● Karaoke Machines
MAX5406EUM
MAX5406ETM*
*Future product—contact factory for availability.
-40°C to +85°C 48 TSSOP
-40°C to +85°C 48 TQFN
U48-1
T4877-6
● Flat-Screen TVs
Pin Configurations appear at end of data sheet.
SmartWiper is a trademark of Maxim Integrated Products, Inc.
19-3817; Rev 1; 4/14
MAX5406
Audio Processor with Pushbutton Interface
Absolute Maximum Ratings
L1_H, L1_L, L2_H, L2_L
V
V
V
to V ..............................................................-0.3V to +6V
DD SS
to V ................... -0.3V to the lower of (V
+ 0.3V) or +6V
+ 0.3V) or +6V
to V
......................................................................±6V
SS
DD
DD
DD
LOGIC
R1_H, R1_L, R2_H, R2_L
to DGND ....................................................-0.3V to +6V
LOGIC
to V ................... -0.3V to the lower of (V
DGND to V ..........................................................-0.3V to +6V
SS
SS
AMB, BALL, BALR, VOLUP, VOLDN, MUTE, SHDN, BASSDN,
LOUT, ROUT, SUBOUT Short Circuited to V
......Continuous
SS
BASSUP, TREBDN, TREBUP
Continuous Power Dissipation (T = +70°C)
A
to DGND..........-0.3V to the lower of (V
+ 0.3V) or +6V
48-Pin TQFN (derate 27.8mW/°C above +70°C)......2222mW
48-Pin TSSOP (derate 16mW/°C above +70°C).......1282mW
Operating Temperature Range........................... -40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
LOGIC
CTL_, CTR_, CBL_, CBR_, CLS_, CRS_, CSUB, CBIAS,
CMSNS, AMBLI, AMBRI, BIAS
to V ................... -0.3V to the lower of (V
+ 0.3V) or +6V
SS
DD
LOUT, ROUT, SUBOUT, LMR,
LPR to V ........... -0.3V to the lower of (V
+ 0.3V) or +6V
SS
DD
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(V
= V
= +5.0V, V
= 0, V
= V
= V /2, DGND = 0, ambience disabled, V
= V
= V , V
BIAS R1_L
=
DD
LOGIC
SS
BIAS
CMSNS
DD
AMBLI
AMBRI
V
= V
= V
= external V
, C
= 0.15µF, C
= C
= 1µF, C
= C
= 3.3nF, C
= C
= 4.7nF, C
L1_L
R2_L
L2_L
BIAS CSUB
CLS
CRS
CBL
CBR
CTL
CTR BIAS
= 0.1µF, C
= 50µF (see the Typical Application Circuit), T = T
to T
unless otherwise specified. Typical values are at T
CBIAS
A
MIN
MAX A
= +25°C). (Note1)
PARAMETER
SYMBOL
CONDITIONS
MIN
8
TYP
10
20
5
MAX
UNITS
R
With respect to
INH
INL
Signal-Inputs Input Resistance
R
kΩ
IN
IN
V
BIAS
R
16
Signal-Inputs Input Capacitance
RF Rejection
C
With respect to V
pF
BIAS
2MHz to 2.4GHz two-tone test,
2/2.01MHz input to 10kHz out
20
dBc
V
= +5V, V = 0, V
= V
, gain
DD
SS
CM
BIAS
-4
+4
error ≤ -0.5dB
Differential Input Voltage Range
V
V
V
IN
V
= +2.7V, V = -2.7V, V
= V
,
DD
SS
CM
BIAS
-4.5
+4.5
gain error ≤ -0.5dB
V
V
= +5V, V = 0, V
= V /2,
DD
DIFF
SS
BIAS DD
= 100mV
Common-Mode Input Voltage
Range
V
V
+ 0.5V
V - 0.5V
DD
CM
SS
V
V
= +2.7V, V = -2.7V, V
= 0,
DD
DIFF
SS
BIAS
= 100mV
Bias Voltage
V
Internally generated (V
= V
)
(V + V )/2
DD SS
V
BIAS
CMSNS
SS
L_ _H = R_ _H = V
, L_ _L = R_ _L =
BIAS
DD
Bias-Voltage Input Current
1
mA
open, V
= V
CMSNS
AUDIO PROCESSING FUNCTIONS
Maximum Balance Difference
Minimum Balance Difference
Balance Resolution
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
10
12
0
14
dB
dB
2
dB
Maximum Volume Attenuation
Minimum Volume Attenuation
Volume Resolution
-63
-62
0
-59
dB
-0.5
+0.5
dB
2
dB
Volume-Control Steps
32
steps
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MAX5406
Audio Processor with Pushbutton Interface
Electrical Characteristics (continued)
(V
= V
= +5.0V, V
= 0, V
= V
= V /2, DGND = 0, ambience disabled, V
= V
= V , V
BIAS R1_L
=
DD
LOGIC
SS
BIAS
CMSNS
DD
AMBLI
AMBRI
V
= V
= V
= external V
, C
= 0.15µF, C
= C
= 1µF, C
= C
= 3.3nF, C
= C
= 4.7nF, C
L1_L
R2_L
L2_L
BIAS CSUB
CLS
CRS
CBL
CBR
CTL
CTR BIAS
= 0.1µF, C
= 50µF (see the Typical Application Circuit), T = T
to T
unless otherwise specified. Typical values are at T
CBIAS
A
MIN
MAX A
= +25°C). (Note1)
PARAMETER
SYMBOL
CONDITIONS
Volume = 0dB (Note 2)
Volume = 0dB (Note 2)
= 1kHz, treble = 0dB,
MIN
TYP
MAX
UNITS
Gain Matching of Input 1 to Input
2 of Each Channel
-0.1
+0.1
dB
Gain Matching of Left to Right
Channel
-0.1
10
+0.1
dB
dB
dB
dB
dB
f
BASS
Bass-Boost Range
Bass-Cut Range
14
14
15
15
C
= open, C
= open (Note 3)
CB_
CT_
f
= 1kHz, treble = 0dB,
BASS
10
C
= open, C
= open (Note 3)
CB_
CT_
f
= 1kHz, bass = 0dB,
TREBLE
Treble-Boost Range
Treble-Cut Range
10
C
= open, C
= short (Note 3)
CB_
CT_
f
= 1kHz, bass = 0dB,
TREBLE
10
C
= open, C
= short (Note 3)
CB_
CT_
Bass-Boost/-Cut Steps
Treble-Boost/-Cut Steps
Bass End-to-End Resistance
Treble End-to-End Resistance
Bass Series Resistance
Treble Series Resistance
Mute Attenuation
Max boost to max cut
Max boost to max cut
21
21
steps
steps
kΩ
R
R
116
17
BPOT
kΩ
TPOT
R
40
kΩ
B
R
3.5
-90
kΩ
T
dB
AC PERFORMANCE (V = 1V , R = 10kΩ, V
= +2.7V, V = -2.7V, volume = 0dB, treble = bass = 0dB)
SS
IN
P-P
L
DD
Total Harmonic Distortion Plus
Noise
THD+N
(Notes 4, 5)
L to R or R to L
0.02
-70
0.05
%
Interchannel Crosstalk
ROUT/LOUT OUTPUTS
Maximum Load Capacitance
Output-Voltage Swing
dB
C
100
pF
V
LOAD
V
R = 10kΩ, V
= +2.7V, V = -2.7V
-2.3
-30
+2.3
+30
OUTP-P
L
DD
SS
V
= +2.7V, V = -2.7V, volume = 0dB,
SS
DD
Output Offset Voltage
V
0
mV
OOS
R = 10kΩ, inputs = V
L
BIAS
Short-Circuit Output Current
Output Resistance
I
Shorted to V
15
mA
SC
SS
R
I
= 100µA to 500µA
LOAD
10
Ω
_OUT
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MAX5406
Audio Processor with Pushbutton Interface
Electrical Characteristics (continued)
(V
= V
= +5.0V, V
= 0, V
= V
= V /2, DGND = 0, ambience disabled, V
= V
= V , V
BIAS R1_L
=
DD
LOGIC
SS
BIAS
CMSNS
DD
AMBLI
AMBRI
V
= V
= V
= external V
, C
= 0.15µF, C
= C
= 1µF, C
= C
= 3.3nF, C
= C
= 4.7nF, C
L1_L
R2_L
L2_L
BIAS CSUB
CLS
CRS
CBL
CBR
CTL
CTR BIAS
= 0.1µF, C
= 50µF (see the Typical Application Circuit), T = T
to T
unless otherwise specified. Typical values are at T
CBIAS
A
MIN
MAX A
= +25°C). (Note1)
PARAMETER
SYMBOL
CONDITIONS
= 20Hz to 20kHz, V = V ,
BIAS
MIN
TYP
MAX
UNITS
µV
f
BW
IN
mute on, noise measured at LOUT and
3.5
9.5
RMS
ROUT (Notes 2, 4, 5)
Output Noise
e
n
f
= 20Hz to 20kHz, V = V
, mute
BW
IN
BIAS
off, volume = 0dB, noise measured at
LOUT and ROUT (Notes 2, 4, 5)
25
35
100mV
100mV
at 217Hz on V
-70
-65
dB
P-P
P-P
DD
Power-Supply Rejection Ratio
PSRR
at 1kHz on V
DD
SUBWOOFER OUTPUT
Gain
(V
- V
) to (V
- V
),
L1_H
L1_L
SUBOUT
BIAS
-6
dB
Hz
kΩ
Hz
kΩ
volume = 0dB (Note 2)
Highpass Filter Cutoff Frequency
Volume = 0dB
15
Internal Highpass Cutoff
Resistance
R
Figure 12
13.8
100
10.6
100
_S
Lowpass Filter Cutoff Frequency
Volume = 0dB
Figure 12
Internal Lowpass Cutoff
Resistance
R
SUB
Maximum Load Capacitance
Output-Voltage Swing
C
pF
V
SUBLOAD
V
R = 10kΩ, V
= +2.7V, V = -2.7V
-2.3
-15
+2.3
+15
SUBOUTP-P
L
DD
SS
V
= +2.7V, V = -2.7V, volume = 0dB,
SS
DD
Output Offset Voltage
V
0
mV
SUBOOS
R = 10kΩ
L
Short-Circuit Output Current
Output Resistance
I
Shorted to V
12
mA
SUBSC
SS
R
I
f
= 100µA to 500µA
LOAD
10
11
Ω
SUBOUT
= 20Hz to 20kHz, V = V ,
BIAS
BW
IN
mute on, noise measured at SUBOUT
9
(Notes 2, 4, 5)
Output Noise
e
µV
RMS
n
f
= 20Hz to 20kHz, V = V
,
BW
IN
BIAS
volume = 0dB, mute off, noise measured
25
35
at SUBOUT (Notes 2, 4, 5)
100mV
100mV
at 217Hz on V
-70
-65
P-P
P-P
DD
Power-Supply Rejection Ratio
PSRR
dB
at 1kHz on V
DD
PUSHBUTTON CONTACT INPUTS (MUTE, AMB, VOLUP, VOLDN, BALL, BALR, BASSUP, BASSDN, TREBUP, TREBDN)
Internal Pullup Resistor
R
50
kΩ
PU
Single-Pulse Input Low Time
t
Figures 2a, 11a, 11b
Figure 2b, 11a, 11b
30
40
ms
LPW
Repetitive Input Pulse
Separation Time
t
ms
HPW
First Autoincrement Point
First Autoincrement Rate
Second Autoincrement Point
Second Autoincrement Rate
t
f
t
f
Figure 3
Figure 3
Figure 3
Figure 3
1
4
s
A1
A1
A2
A2
Hz
s
4
16
Hz
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MAX5406
Audio Processor with Pushbutton Interface
Electrical Characteristics (continued)
(V
= V
= +5.0V, V
= 0, V
= V
= V /2, DGND = 0, ambience disabled, V
= V
= V , V
BIAS R1_L
=
DD
LOGIC
SS
BIAS
CMSNS
DD
AMBLI
AMBRI
V
= V
= V
= external V
, C
= 0.15µF, C
= C
= 1µF, C
= C
= 3.3nF, C
= C
= 4.7nF, C
L1_L
R2_L
L2_L
BIAS CSUB
CLS
CRS
CBL
CBR
CTL
CTR BIAS
= 0.1µF, C
= 50µF (see the Typical Application Circuit), T = T
to T
unless otherwise specified. Typical values are at T
CBIAS
A
MIN
MAX A
= +25°C). (Note1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DIGITAL INPUTS (V
Input-Voltage High
Input-Voltage Low
> 3.6V) (MUTE, AMB, VOLUP, VOLDN, BALL, BALR, BASSUP, BASSDN, TREBUP, TREBDN)
LOGIC
V
2.4
3.4
V
V
IH
V
0.8
IL
SHDN Input-Voltage High
SHDN Input-Voltage Low
Input Leakage Current
Input Capacitance
V
V
IHSHDN
V
0.8
±5
V
ILSHDN
µA
pF
5
DIGITAL INPUTS (V
LOGIC
≤ 3.6V) (MUTE, AMB, VOLUP, VOLDN, BALL, BALR, BASSUP, BASSDN, TREBUP, TREBDN)
Input-Voltage High
V
2
V
V
IH
Input-Voltage Low
V
0.6
IL
SHDN Input-Voltage High
SHDN Input-Voltage Low
Input Leakage Current
Input Capacitance
V
2
V
IHSHDN
V
0.6
±5
V
ILSHDN
µA
pF
5
TIMING CHARACTERISTICS
Click/pop suppression inactive,
Figures 2a, 11a, 11b
Wiper Settling Time
t
45
ms
WS
POWER SUPPLIES (V
= V , internal bias enabled)
SS
CMSNS
Supply-Voltage Difference
V
- V
+5.5
+5.5
0
V
V
V
DD
SS
Positive Analog Supply Voltage
Negative Analog Supply Voltage
V
+2.7
-2.7
DD
SS
V
V
Dual-Supply Positive Supply
Voltage
V
= -2.7V
0
+2.7
V
DD
SS
No signal, all logic inputs pulled high to
or unconnected, SHDN = V ,
LOGIC
Active Positive Supply Current
I
V
10
13
mA
DD
LOGIC
R = 10kΩ (Note 6)
L
No signal, all logic inputs connected to
DGND or V , V = +5V, V = 0
-13
-13
-10
-10
LOGIC DD
SS
Active Negative Supply Current
(Note 6)
I
mA
µA
SS
No signal, all logic inputs connected to
DGND or V , V = +2.7V,
LOGIC DD
V
= -2.7V
SS
No signal, V
inputs connected to DGND or V
SHDN = DGND
= 5V, V = 0, all logic
SS
DD
,
0.2
LOGIC
Shutdown Supply Current
(Note 6)
I
SHDN
No signal, V
= +2.7V,
I
0.2
50
DD
DD
V
= -2.7V, all logic at DGND
SS
I
or V
, SHDN = DGND
SS
LOGIC
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MAX5406
Audio Processor with Pushbutton Interface
Electrical Characteristics (continued)
(V
= V
= +5.0V, V
= 0, V
= V
= V /2, DGND = 0, ambience disabled, V
= V
= V , V
BIAS R1_L
=
DD
LOGIC
SS
BIAS
CMSNS
DD
AMBLI
AMBRI
V
= V
= V
= external V
, C
= 0.15µF, C
= C
= 1µF, C
= C
= 3.3nF, C
= C
= 4.7nF, C
L1_L
R2_L
L2_L
BIAS CSUB
CLS
CRS
CBL
CBR
CTL
CTR BIAS
= 0.1µF, C
= 50µF (see the Typical Application Circuit), T = T
to T
unless otherwise specified. Typical values are at T
CBIAS
A
MIN
MAX A
= +25°C). (Note1)
PARAMETER
SYMBOL
CONDITIONS
Power first applied, _OUT = -20dB
From shutdown (Note 7)
MIN
TYP
1
MAX
UNITS
ms
Power-Up Time
t
PU
Wake-Up Time
t
1
ms
WU
Logic Supply Voltage
V
DGND = 0, V
≤ V
+2.7
V
DD
V
LOGIC
LOGIC
DD
No signal, one button pressed, remaining
Logic Active Supply Current
I
logic inputs connected to V
unconnected
or
150
µA
LOGIC
LOGIC
No signal, all logic inputs connected to
or unconnected, SHDN = DGND
Logic Shutdown Supply Current
V
02
2
µA
LOGIC
(Note 6)
Note 1: All devices 100% production tested at T = +85°C. Limits over the operating temperature range are guaranteed by design.
A
CT_
Note 2: Treble = bass = 0dB. C
= open, C
= short, left input signal = right input signal = +2V.
CB_
Note 3: See Tables 3 and 4 and Figure 7. V
= +2.7V, V = -2.7V.
SS
DD
Note 4: Guaranteed by design.
Note 5: Measured with A-weighted filter.
Note 6: Supply current measured while attenuator position is fixed.
Note 7: Set _OUT = 0dB and shutdown device SHDN = 0. t
is the time required for _OUT to reach 0dB after SHDN goes high.
WU
Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
ATTENUATION vs. TAP POSITION
ATTENUATION vs. TAP POSITION
BAXANDALL CURVE
0
0
-10
-20
-30
-40
-50
-60
-70
15
10
5
V
= V
= 5V, V = 0
LOGIC SS
DD
V
= V
= 5V, V = 0
LOGIC SS
V
DD
= V
= 2.7V, V = -2.7V
LOGIC SS
DD
TREBLE = BASS
VOLUP = 0dB
-10
-20
-30
-40
-50
-60
-70
0
-5
-10
-15
C
CB_
C
CT_
= 10nF
= 2.2nF
0
4
8
12 16 20 24 28 32
TAP POSITION
0
4
8
12 16 20 24 28 32
TAP POSITION
10
100
1000
10,000
100,000
FREQUENCY (Hz)
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MAX5406
Audio Processor with Pushbutton Interface
Typical Operating Characteristics (continued)
(T = +25°C, unless otherwise noted.)
A
BAXANDALL CURVE
BAXANDALL CURVE
BAXANDALL CURVE
20
15
10
5
15
10
5
V
V
= V
= 0.5V
= 2.7V, V = -2.7V
LOGIC SS
C
C
= 10nF
= 2.2nF
DD
CB_
IN
P-P
15
10
5
CT_
BASS = TREBLE
V
DD
= V
= 5V, V = 0
SS
LOGIC
BASS = 0dB
0
0
0
-5
-5
-5
C
C
= 10nF
CB_
-10
-15
-20
-10
-15
-20
-10
-15
-20
= 2.2nF
=2.7V, V = -2.7V
LOGIC SS
CT_
V
V
= V
DD
C
CB_
C
CT_
= 10nF
= 2.2nF
= 0.5V
IN
P-P
BASS = 0dB
10
100
1000
10,000
100,000
10
100
1000
10,000
100,000
10
100
1000
10,000
100,000
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
SINGLE-SUPPLY SUBOUT
FREQUENCY RESPONSE
BAXANDALL CURVE
BAXANDALL CURVE
15
10
5
20
15
10
5
10
0
C
C
V
= 10nF
= 2.2nF
C
C
V
= 10nF
= 2.2nF
CB_
CT_
CB_
CT_
= V
= 2.7V,
= V
= 5V, V = 0
SS
DD
LOGIC
DUAL INPUTS
DD
LOGIC
V
SS
= -2.7V, V = 0.5V
-10
-20
-30
-40
-50
-60
-70
TREBLE = 0dB
IN P-P
TREBLE = 0dB
0
0
-5
-5
-10
-15
-20
-10
-15
10
100
1000
10,000
100,000
10
100
1000
10,000
100,000
10
100
1000
10,000
100,000
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
DUAL-SUPPLIES LOUT
FREQUENCY RESPONSE
DUAL-SUPPLIES SUBOUT
FREQUENCY RESPONSE
LOUT FREQUENCY RESPONSE
10
0
10
5
10
5
V
= V
= 5V, V = 0
V
= V
= 2.7V, V = -2.7V
LOGIC SS
DD
LOGIC
SS
DD
DUAL INPUTS
VOLUP = 0dB
VOLUP = 0dB
0
0
-10
-20
-30
-40
-50
-60
-5
-5
-10
-15
-20
-25
-30
-35
-10
-15
-20
-25
-30
-35
V
= V
= 2.7V, V = -2.7V
LOGIC SS
DD
VOLUP = 0dB
10
100
1000
10,000
100,000
10
100
1k
10k 100k
1M
10M
10
100
1k
10k 100k
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
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MAX5406
Audio Processor with Pushbutton Interface
Typical Operating Characteristics (continued)
(T = +25°C, unless otherwise noted.)
A
DUAL-SUPPLIES ROUT
FREQUENCY RESPONSE
ROUT FREQUENCY RESPONSE
PSRR vs. FREQUENCY
MAX5406 toc4a
5
10
5
0
V
= V
= 2.7V, V = -2.7V
LOGIC SS
V
DD
= V
= 5V, V = 0
LOGIC SS
DD
0
VOLUP = 0dB
-10
-20
-30
-40
-50
-60
100mV ON V
P-P DD
0
-5
V
= V
= 5V, V = 0
LOGIC SS
DD
VOLUP = 0dB
-5
-10
-15
-20
-25
-30
-35
-10
-15
-20
-25
-30
-35
-70
-80
10
100
1k
10k 100k
1M
10M
10
100
1k
10k 100k
1M 10M
0.1
1
10
100
1,000
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (kHz)
OUTPUT SWING
vs. SUPPLY VOLTAGE
PSRR vs. FREQUENCY
PSRR vs. FREQUENCY
MAX5406 toc4b
MAX5406 toc4c
10
10
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= V
= 2.7V, V = -2.7V
LOGIC SS
SINGLE-SUPPLY OPERATION
V
= V
= 2.7V, V = -2.7V
LOGIC SS
DD
DD
0
0
100mV ON POSITIVE SUPPLY
V
DD
= V
THD = 0.02% AT 1kHz
100mV ON NEGATIVE SUPPLY
P-P
LOGIC,
P-P
-10
-10
-20
-30
-40
-50
-60
-70
-80
-90
-20
-30
-40
-50
-60
-70
-80
0.1
0.1
1
10
100
1,000
1
10
100
1,000
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
(V)
V
DD
FREQUENCY (kHz)
FREQUENCY (kHz)
OUTPUT SWING
vs. SUPPLY VOLTAGE
TOTAL SUPPLY CURRENT
vs. TEMPERATURE (I + I
TOTAL SUPPLY CURRENT
vs. TEMPERATURE (I + I
)
)
DD LOGIC
DD LOGIC
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
12.0
11.5
11.0
10.5
10.0
9.5
15
13
11
9
DUAL-SUPPLY OPERATION
V
= V
= 5V, V = 0
V
= V
= 2.7V, V = -2.7V
LOGIC SS
DD
LOGIC
SS
DD
V
LOGIC
= V THD = 0.02% AT 1kHz
DD,
TOTAL SUPPLY CURRENT: I + I
DD LOGIC
ACTIVE MODE (ONE BUTTON PUSHED)
ACTIVE MODE, ONE BUTTON PUSHED
INACTIVE MODE (NO BUTTON PUSHED)
INACTIVE MODE, NO BUTTON PUSHED
9.0
7
8.5
8.0
5
3.0
3.5
4.0
4.5
5.0
5.5
-40
-15
10
35
60
85
-40
-15
10
35
60
85
(V - V ) (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
DD
SS
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MAX5406
Audio Processor with Pushbutton Interface
Typical Operating Characteristics (continued)
(T = +25°C, unless otherwise noted.)
A
WIPER SWITCHING TRANSIENT
(SUPPRESSION CIRCUIT ACTIVE)
WIPER SWITCHING TRANSIENT
I
vs. V
LOGIC
LOGIC
MAX5406 toc07a
MAX5406 toc07b
200
180
160
140
120
100
80
DC LEVEL AT
THE INPUT
5V SINE WAVE
P-P
BETWEEN L1_H
AND L1_L
T
= -40°C
A
OUTPUT
VOLUP
T
A
= +85°C
60
T
A
= +25°C
OUTPUT
40
V
= 5.5V, V = 0
SS
DD
20
ACTIVE MODE (ONE BUTTON PUSHED)
0
10µs/div
4ms/div
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
V
LOGIC
(V)
THD PLUS NOISE vs. FREQUENCY
I
vs. V
THD PLUS NOISE vs. FREQUENCY
LOGIC
LOGIC
0.1
1
0.1
240
220
200
180
160
140
120
100
80
V
= 5.5V, V = 0
V
V
= V = 2.7V, V = -2.7
LOGIC SS
V
V
= V
= 4.6V
= 5V, V = GND
LOGIC SS
DD
SS
DD
DD
INACTIVE MODE (NO BUTTON PUSHED)
= 4.6V
IN
P-P
IN
P-P
T
A
= -40°C
R = 10kΩ
L
R = 10kΩ
L
T
= +25°C
A
0.01
0.001
NO LOAD
60
NO LOAD
0.1
40
T
= +85°C
A
20
0.01
0
0.01
1
10
100
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
(V)
0.01
0.1
1
10
100
FREQUENCY (Hz)
V
LOGIC
FREQUENCY (kHz)
TOTAL SUPPLY CURRENT
CROSSTALK vs. FREQUENCY
CROSSTALK vs. FREQUENCY
vs. SUPPLY VOLTAGE (I + I
)
DD LOGIC
MAX5406 toc10a
MAX5406 toc10b
0
0
12.0
11.5
11.0
10.5
10.0
9.5
V
V
= 2.7V, V = -2.7V, V
= 2.5V,
LOGIC
V
V
= V
= 5V, V = 0,
LOGIC SS
V
DD
= V
= 5V, V = 0
LOGIC SS
DD
SS
DD
-10
-20
-30
-40
-50
-60
-10
-20
-30
-40
-50
-60
-70
-80
= 1V , R = 10kΩ
P-P L
= 1V , R = 10kΩ
ACTIVE MODE, ONE BUTTON PUSHED
IN
IN
P-P
L
T
A
= +25°C
T
A
= +85°C
T
A
= -40°C
9.0
-70
-80
-90
8.5
8.0
10
10
100
1k
10k
100k
1M
100
1k
10k
100k
1M
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
FREQUENCY (Hz)
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MAX5406
Audio Processor with Pushbutton Interface
Typical Operating Characteristics (continued)
(T = +25°C, unless otherwise noted.)
A
TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE (I + I
)
LOUT NOISE vs. FREQUENCY
DD LOGIC
12.0
11.5
11.0
10.5
10.0
9.5
1.9
1.7
1.5
1.3
V
DD
= V
= 2.7V, V = -2.7V
LOGIC SS
V
= V
= 5V, V = 0
LOGIC SS
DD
INACTIVE MODE, NO BUTTON PUSHED
T
= +25°C
A
1.1
0.9
0.7
0.5
0.3
0.1
T
= -40°C
A
MUTE ON
MUTE OFF
9.0
T
A
= +85°C
8.5
8.0
-0.1
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
0.01
0.1
1
10
100
FREQUENCY (kHz)
ROUT NOISE vs. FREQUENCY
SUBOUT NOISE vs. FREQUENCY
2
1.9
1.7
V
DD
= V
= 2.7V, V = -2.7V
LOGIC SS
V
DD
= V
= 2.7V, V = -2.7V
LOGIC SS
1.8
1.6
1.4
1.2
1
1.5
1.3
1.1
0.9
0.7
0.5
0.3
0.1
-0.1
0.8
0.6
0.4
MUTE ON
MUTE OFF
0.2
0
0.01
0.1
1
10
100
0.01
0.1
1
10
100
FREQUENCY (kHz)
FREQUENCY (kHz)
INPUT RF REJECTION
VOLUME = 0dB
= 2.7V, V = -2.7V
-10
-30
-50
-70
V
DD
SS
INPUT = 200mV AT L1_H
P-P
-90
-110
1
10
100
1000
10,000
f FREQUENCY (MHz)
1
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MAX5406
Audio Processor with Pushbutton Interface
Pin Description
PIN
NAME
FUNCTION
TSSOP TQFN
Bypass Capacitor Connection Point to Internally Generated Bias. Bypass CBIAS with a 50µF
capacitor to system analog ground.
1
2
3
43
44
45
CBIAS
V
Negative Power-Supply Input. Bypass with a 0.1µF capacitor to system analog ground.
SS
Left-Channel 1 High Terminal Input. Connect the source between L1_H and L1_L for differential
signals. Connect the source to L1_H and tie L1_L to BIAS for single-ended signals.
L1_H
L1_L
L2_L
L2_H
LMR
Left-Channel 1 Low Terminal Input. Connect the source between L1_H and L1_L for differential
signals. Connect L1_L to BIAS for single-ended signals.
4
5
6
7
46
47
48
1
Left-Channel 2 Low Terminal Input. Connect the source between L2_H and L2_L for differential
signals. Connect L2_L to BIAS for single-ended signals.
Left-Channel 2 High Terminal Input. Connect the source between L2_H and L2_L for differential
signals. Connect the source to L2_H and tie L2_L to BIAS for single-ended signals.
Left Minus Right Output Signal. LMR output provides a signal that is the difference of left and
right input signals. See the Ambience Control section for more details.
Ambience Left-Channel Input. AMBLI provides the proper ambient effect at LOUT based on the
transfer function implemented between LMR and AMBLI. See the Ambience Control section for
more details.
8
2
AMBLI
Left-Channel Treble Tone Control Capacitor Terminal 1. Connect a capacitor between CTL1 and
CTL2 to set the treble cutoff frequency. See the Tone Control section for more details.
9
3
4
5
CTL1
CTL2
CBL1
Left-Channel Treble Tone Control Capacitor Terminal 2. Connect a capacitor between CTL2 and
CTL1 to set the treble cutoff frequency. See the Tone Control section for more details.
10
11
Left-Channel Bass Tone Control Capacitor Terminal 1. Connect a capacitor between CBL1 and
CBL2 to set the bass cutoff frequency. See the Tone Control section for more details.
Left-Channel Bass Tone Control Capacitor Terminal 2. Connect a capacitor between CBL2 and
CBL1 to set the bass cutoff frequency. See the Tone Control section for more details.
12
13
6
7
CBL2
LOUT
Left-Channel Output
Subwoofer Left-Channel Highpass Filter Capacitor Negative Terminal. Connect a capacitor
between CLSN and CLSP to set the highpass cutoff frequency at SUBOUT. See the Subwoofer
Ouput section for more details.
14
8
CLSN
Subwoofer Left-Channel Highpass Filter Capacitor Positive Terminal. Connect a capacitor
between CLSP and CLSN to set the highpass filter cutoff frequency at SUBOUT. See the
Subwoofer Ouput section for more details.
15
16
9
CLSP
Subwoofer Output. Connect a capacitor from SUBOUT to CSUB to set the lowpass filter cutoff
frequency at SUBOUT. See the Subwoofer Ouput section for more details.
10
SUBOUT
Subwoofer Lowpass Filter Capacitor Terminal. Connect a filter capacitor between CSUB and
SUBOUT to set the lowpass filter cutoff frequency. See the Subwoofer Ouput section for more
details.
17
11
CSUB
I.C.
18, 32
12, 26
Internally Connected. Connect to DGND.
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MAX5406
Audio Processor with Pushbutton Interface
Pin Description (continued)
PIN
NAME
FUNCTION
TSSOP
TQFN
Active-Low Mute Control Input. Toggles state between muted and not muted. When in the mute
state, all wipers are moved to the low end of the volume potentiometers. The last state is restored
when MUTE is toggled again. The power-on state is not muted. MUTE is internally pulled up with
19
13
MUTE
50kΩ to V
.
LOGIC
Active-Low Downward Volume Control Input. Press VOLDN to decrease the volume. This
simultaneously moves left and right volume wipers towards higher attenuation. VOLDN is
20
21
14
15
VOLDN
internally pulled up with 50kΩ to V
.
LOGIC
Active-Low Upward Volume Control Input. Press VOLUP to increase the volume. This
simultaneously moves the left and right volume wipers towards the the lower attenuation.
VOLUP
BALL
VOLUP is internally pulled up with 50kΩ to V
.
LOGIC
Active-Low Left Balance Control Input. Press BALL to move the balance towards the left channel.
BALL is internally pulled up with 50kΩ to V
22
23
16
17
.
LOGIC
Active-Low Right Balance Control Input. Press BALR to move the balance towards the right
BALR
channel. BALR is internally pulled up with 50kΩ to V
.
LOGIC
24
25
18
19
DGND
Digital Ground
V
Digital Power-Supply Input. Bypass with 0.1µF to DGND.
LOGIC
Active-Low Shutdown Control Input. In shutdown mode, the MAX5406 stores every wiper’s last
position. Each wiper moves to the highest attenuation level of its corresponding potentiometer.
Terminating shutdown mode restores every wiper to its previous setting. In shutdown, the
MAX5406 does not acknowledge any pushbutton command.
26
27
20
21
SHDN
Active-Low Downward Bass Control Input. Press BASSDN to decrease bass boost. Bass boost
emphasizes the signal’s low-frequency components. BASSDN is internally pulled up with 50kΩ to
BASSDN
BASSUP
V
. To implement a bass-boost button, connect BASSDN to BASSUP. Presses then toggle
LOGIC
the state between flat and full bass boost on each button press.
Active-Low Upward Bass Control Input. Press BASSUP to increase bass boost. Bass boost
emphasizes the signal’s low frequency components. BASSUP is internally pulled up with 50kΩ to
28
29
22
V
. To implement a bass-boost button, connect BASSUP to BASSDN. Presses then toggle
LOGIC
the state between flat and full bass boost on each button press.
Active-Low Downward Treble Control Input. Press TREBDN to decrease the treble boost. Treble
23
TREBDN boost emphasizes the signal’s high-frequency components. TREBDN is internally pulled up with
50kΩ to V
.
LOGIC
Active-Low Upward Treble Control Input. Press TREBUP to increase the treble boost. Treble
30
31
33
24
25
27
TREBUP boost emphasizes the signal’s high-frequency components. TREBUP is internally pulled up with
50kΩ to V
.
LOGIC
Active-Low Ambience Switch Control Input. Drive AMB low to toggle on/off the ambience
function. AMB is internally pulled up with 50kΩ to V
AMB
.
LOGIC
Subwoofer Right-Channel Highpass Filter Capacitor Negative Terminal. Connect a capacitor
between CRSN and CRSP to set the highpass cutoff frequency at SUBOUT. See the Subwoofer
Ouput section for more details.
CRSN
Subwoofer Right-Channel Highpass Filter Capacitor Positive Terminal. Connect a capacitor
between CRSP and CRSN to set the highpass cutoff frequency at SUBOUT. See the Subwoofer
Ouput section for more details.
34
35
28
29
CRSP
ROUT
Right-Channel Output
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MAX5406
Audio Processor with Pushbutton Interface
Pin Description (continued)
PIN
NAME
FUNCTION
TSSOP
TQFN
Right-Channel Bass Tone Control Capacitor Terminal 2. Connect a nonpolorized capacitor
between CBR2 and CBR1 to set the bass cutoff frequency. See the Tone Control section for
more details.
36
30
CBR2
Right-Channel Bass Tone Control Capacitor Terminal 1. Connect a capacitor between CBR1 and
CBR2 to set the bass cutoff frequency. See the Tone Control section for more detail.
37
38
39
40
31
32
33
34
CBR1
CTR2
CTR1
AMBRI
LPR
Right-Channel Treble Tone Control Capacitor Terminal 2. Connect a capacitor between CTR2
and CTR1 to set the treble cutoff frequency. See the Tone Control section for more details.
Right-Channel Treble Tone Control Capacitor Terminal 1. Connect a capacitor between CTR1
and CTR2 to set the treble cutoff frequency. See the Tone Control section for more details.
Ambience Right-Channel Input. AMBRI provides the proper ambient effect at ROUT based on the
gain between LPR and AMBRI. See the Ambience Control section for more details.
Left Plus Right Output Signal. LPR output provides a signal that is a combination of the left and
right input signals. See the Ambience Control section for more details.
41
42
43
35
36
37
V
Positive Analog Supply Voltage. Bypass with a 0.1µF capacitor to system analog ground.
DD
Right-Channel High Terminal 2. Connect the source between R2_H and R2_L for differential
signal. Connect the source to R2_H and tie R2_L to BIAS for single-ended signals.
R2_H
R2_L
Right-Channel Low Terminal 2. Connect the source between R2_H and R2_L for differential
signal. Connect R2_L to BIAS for single-ended signals.
44
45
46
47
38
39
40
41
Right-Channel Low Terminal 1. Connect the source between R1_H and R1_L for differential
signal. Connect R1_L to BIAS for single-ended signals.
R1_L
Right-Channel High Terminal 1. Connect the source between R1_H and R1_L for differential
signal. Connect the source to R1_H and tie R1_L to BIAS for single-ended signals.
R1_H
CMSNS
Common-Mode Voltage Sense. Connect to V
to disable the internal bias generator and drive
DD
BIAS with external source to set output DC level.
Internally Generated Bias Voltage. Connect CMSNS to V to enable the internally generated
SS
48
42
BIAS
V
. V
= (V
+ V )/2. Connect a 0.1µF capacitor between BIAS and system analog
BIAS BIAS
DD SS
ground as close to the device as possible. Do not use BIAS to drive external circuitry.
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MAX5406
Audio Processor with Pushbutton Interface
V
DD
LMR AMBLI
CBL1 CBL2
CTL1 CTL2
LEFT
LOG POT
LEFT AMBIENCE
SWITCH
L1_H
BASS/TREBLE OUTPUT STAGE
SEE FIGURE 7
RF FILTER
LOUT
CLSP
CONTROLLED
BY AMB
L1_L
L2_H
L2_L
RF FILTER
CBIAS
CMSNS
BIAS
BIAS
GENERATOR
CLSN
R
R
LS
R1_H
R1_L
RF FILTER
RF FILTER
SUBOUT
RIGHT AMBIENCE
SWITCH
R2_H
R2_L
R
SUB
CONTROLLED
BY AMB
RS
CSUB
CRSN
CRSP
ROUT
MAX5406
BASS/TREBLE OUTPUT STAGE
SEE FIGURE 7
RIGHT
LOG POT
DIGITAL INTERFACE
CBR1 CBR2
CTR1 CTR2
BASSUPTREBUP
VOLUP
BALR
VOLDN
BALL
SHDN
LPR
AMB
V
SS
DGND
AMBRI
V
TREBDN
BASSDN
MUTE
LOGIC
Figure 1. Block Diagram
to control the audio-processor settings. The MAX5406
provides differential buffered inputs with RF filters to maxi-
mize noise reduction and a mixer to produce an equal
amount of left and right input channels. In addition to a
differential output, the MAX5406 provides a monophonic
output at SUBOUT for systems with a subwoofer.
Detailed Description
The MAX5406 implements dual logarithmic potentiome-
ters to control volume, dual potentiometers to control bal-
ance, and dual linear digital potentiometers to set the tone
(Figure 1). A debounced pushbutton interface is provided
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MAX5406
Audio Processor with Pushbutton Interface
Table 1. Wiper Action vs. Pushbutton
Contact Duration
Table 2. Attenuator Position For Volume
Potentiometers
POSITION
ATTENUATION (dB)
CONTACT
WIPER ACTION
DURATION
0
0
2
t < t
No motion (debouncing) (Figures 2a and 2b)
LPW
1
Wiper changes position once (Figures 2a
and 2b)
2
4
t
≤ t ≤ 1s
LPW
…..
…..
20
…..
60
62
> 90
Wiper changes position at a rate of 4Hz
(Figure 3)
1s ≤ t < 4s
t ≥4s
10 ( Power-on state)
…..
30
Wiper changes position at a rate of 16Hz
(Figure 3)
31
32 (Mute)
Volume and Balance Interaction
Up/Down Interface
Volume and balance operation is simple. However, there
are some interactions that occur at the extreme wiper
positions. These interactions are described in this section
of the data sheet.
The MAX5406 features independent control inputs for
volume, balance, ambience, and tone control. All control
inputs are internally debounced for use with momentary
contact SPST switches. All switch inputs are pulled up
to V
through 50kΩ resistors. The wiper setting
LOGIC
When the volume setting is at the maximum level, the first
command to move the balance toward the left channel
forces the right channel to decrease by 1dB. Subsequent
pressing of BALL causes the right channel to decrease by
2dB. At this position, shown in the right column of Figure
6a, the left-channel volume is maximum, but the actual
separation between L and R is 3dB.
advances once per button press held for up to 1s (see
Figures 2a and 2b). Maxim’s SmartWiper control circuitry
allows the wiper to advance at a rate of 4Hz when an
input is held low from 1s up to 4s, and at a rate of 16Hz if
the contact is maintained for greater than 4s without the
need of a µP (see Figure 3 and Table 1). The MAX5406
ignores multiple buttons being pressed. A µP can also be
used to control the MAX5406.
At this position, pressing VOLDN restores the actual bal-
ance setting only after VOLDN is pressed at least half as
many times as BALL was (previously) pressed (shown in
the middle and right column of Figure 6b) to increase the
right-channel balance.
Volume Control
The MAX5406 implements dual logarithmic potentiom-
eters for volume control that change the sound level by
2dB per button push (see Table 2).
The volume and balance interaction is similar when vol-
ume setting is at the minimum level.
In volume-control mode, the MAX5406’s wipers move up
and down together (see Figure 4). The balance is unaf-
fected (see the Balance Control section). Left and right bal-
ance settings are maintained when adjusting the volume.
Tone Control
The MAX5406 implements a linear potentiometer to con-
trol the bass and treble over a range of ±10dB using the
recommended component values.
Balance Control
In balance-control mode, the MAX5406 uses dual potenti-
ometers to control balance for the left and right channels.
Pressing BALR increases the right channel wiper by 1dB
and decreases the left channel by 1dB. This causes the
right channel to sound louder than the left channel by
2dB. The overall volume remains constant when adjusting
the balance (Figure 5).
Note that the actual response achieved is determined by
the values of both external and internal components and
the design equations are somewhat interactive.
Use the values shown in the Electrical Characteristics as a
good starting point for choosing component values. These
components yield shelf turnovers at 100Hz (bass) and 10kHz
(treble) with a total ±10dB of boost at 100Hz and 10kHz. The
shoulder or flat portion of the response is centered on 1kHz.
The circuit in Figure 7 shows the internal structure of the
tone-control system should modification to the response
Maxim Integrated
│ 15
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MAX5406
Audio Processor with Pushbutton Interface
t
WS
VOLUP
t
LPW
WIPER
MOTION
Figure 2a. Single-Pulse Input
t
HPW
t
LPW
VOLUP
V
IH
V
IL
WIPER
MOTION
Figure 2b. Repetitive Input-Pulse Separation Time
t
A2
t
A1
VOLUP
V
IH
V
IL
1
1
1
1
1
1
WIPER
f
f
f
A2
f
f
f
MOTION
A1
A1
A2
A2
A2
Figure 3. Accelerated Wiper Motion
Maxim Integrated
│ 16
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MAX5406
Audio Processor with Pushbutton Interface
BALANCE SEPARATION
MAINTAINED
L
R
L
R
L
R
PRESS VOLUP
PRESS VOLDN
TWICE
ONCE
Figure 4. Basic Volume-Control Operation
VOLUME LEVEL IS SET
L
R
L
R
L
R
1dB PER STEP
PRESS BALR
ONCE
1dB PER STEP
PRESS BALR
ONCE
1dB PER STEP
Figure 5. Basic Balance-Control Operation
VOLUME LEVEL IS AT MAXIMUM
L
R
L
R
L
R
1dB PER STEP
PRESS BALL
ONCE
2dB PER STEP
PRESS BALL
AGAIN
TO 6b
a)
1dB PER STEP
BALANCE COMPENSATION ENDS
L
R
L
R
L
R
2dB PER STEP
PRESS VOLDN
ONCE
2dB PER STEP
PRESS VOLDN
ONCE
b)
2dB PER STEP
FROM 6a
Figure 6. Volume and Balance Interaction
curve be desired. A combination of internal resistors and
external capacitors determine the response of the circuit.
where R
eter (see Figure 7).
, nominally 116kΩ, is the bass potentiom-
BPOT
Use the following equations to calculate the external
capacitor values for the desired 3dB frequencies:
1
f
=
TREBLE(3dB)
2π ×R × C
T
T_
1
f
=
BASS(3dB)
where R is nominally 3.5kΩ (see Figure 7).
T
2π ×R
× C
B_
BPOT
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│ 17
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MAX5406
Audio Processor with Pushbutton Interface
C
_SP
C
B_
+1
+1
-1
C
B_1
C
B_2
40kΩ
116kΩ
40k
BUFFER
INPUT
AMBLI
AMBRI
LMR
BASS POT
+2
C
C
T_1
Figure 8. Matrix Surround Configuration
C
T_
_OUT
TREBLE POT
T_2
TO BIAS
+1
+1
-1
3.5kΩ
17kΩ
3.5kΩ
AMBLI
AMBRI
LMR
AMBIENCE
NETWORK
Figure 7. Bass/Treble Output Stage
Figure 9. Ambience Filter
Alternatively, the following formulas can be used to
calculate and design for the bass and treble turn-
over frequencies:
1
f
=
BASS(TURNOVER)
+1
+1
2π ×R × C
-1
B
B_
where R is nominally 40kΩ (see Figure 7)
B
AMBLI
AMBRI
LPR
PSEUDOSTEREO
NETWORK
1
f
=
TREBLE(TURNOVER)
2π ×(R + R )× C
T_
T
B
Figure 10. Pseudostereo Filter
Tables 3 and 4 show the effects of the external bass and
treble capacitance on the maximum output attentuation.
Table 3. Effect of Base Tone Control
Capacitor (CB_) on Bass Boost/Bass
Cut at 100Hz
Table 4. Effect of Treble Tone Control
Capacitor (CT_) on Treble Boost/Treble
Cut at 10kHz
C
(nF)
CUT (dB)
-11.79
-11.25
-11.05
-10.95
-10.85
-10.60
-10.57
-10.10
-9.66
BOOST (dB)
C
(nF)
CUT (dB)
BOOST (dB)
B_
0.00
T_
0.47
11.81
-7.80
7.66
0.47
1.80
2.20
2.70
3.30
4.70
6.80
8.20
11.26
1.80
2.20
2.70
3.30
4.70
6.80
8.20
Open
-12.55
-12.89
-13.15
-13.33
-13.55
-13.59
-13.61
-13.79
12.58
11.08
12.95
10.96
13.18
10.86
13.34
10.62
13.58
10.55
13.61
10.15
13.63
9.66
13.75
Maxim Integrated
│ 18
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MAX5406
Audio Processor with Pushbutton Interface
SWITCH
SWITCH
SWITCH
CONTACT CONTACT
IS BOUNCING IS STABLE
CONTACT
IS BOUNCING
READY TO ACCEPT
ANOTHER BUTTON PRESS
PUSHBUTTON PRESSED
1
INPUT ACCEPTED
0
t
HPW
t
t
DEBOUNCE BY
WAITING FOR
WS
LPW
STABLE HIGH, t
HPW
WAIT FOR
FIRST ZERO
CROSSING OR
DEBOUNCE BY
WAITING FOR
STABLE LOW,
TIMEOUT, t
WS
t
LPW
L1_H
L1_L
WIPER MOVES HERE
(t
+ t
)
LPW WS
Figure 11a. Wiper Transition Timing Diagram (No Zero Crossing Detected)
a desk or inside a single enclosure. One way to compen-
sate for this is to increase the apparent separation of the
L and R signals arithmetically. The L and R signals can
be modeled as a channel-specific component added to
a monocomponent. To emphasize the channel-specific
component, one needs to remove the opposite channel-
specific component from the monocomponent.
Ambience Control
Use the ambience function for boom boxes, headphones,
desktop speakers, or other audio products where the
speakers are physically close together. A stereo signal
is designed to be played over speakers that have a wide
physical separation. The ears and brain combine the
sound from these two sources to create a perception of
sounds distributed in space. In the case of headphones,
this wide physical separation does not exist, resulting in
the sound apparently coming from somewhere inside the
head. A similar situation exists when the speakers are not
widely separated, for example when they are located on
This function is accomplished with circuitry inside the
MAX5406 and external network. Control the ambience
effect with the AMB button that toggles between wide (full
effect) and normal (no ambience effect). Use the following
equations for matrix surround (fixed ambience):
Maxim Integrated
│ 19
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MAX5406
Audio Processor with Pushbutton Interface
SWITCH
SWITCH
SWITCH
CONTACT CONTACT
IS BOUNCING IS STABLE
CONTACT
IS BOUNCING
READY TO ACCEPT
ANOTHER BUTTON PRESS
PUSHBUTTON PRESSED
1
INPUT ACCEPTED
0
t
HPW
t
t
DEBOUNCE BY
WAITING FOR
WS
LPW
STABLE HIGH, t
HPW
WAIT FOR
DEBOUNCE BY
WAITING FOR
FIRST ZERO
CROSSING, t
WS
STABLE LOW, t
IPW
WIPER MOVES HERE
WIPER MOTION
Figure 11b. Wiper Transition Timing Diagram (Zero Crossing Detected)
(L -R
)
3
1
IN IN
LOUT = L + F
×
LOUT = L - R
IN
L(S)
IN
IN
4
2
3
2
(L -R
)
1
IN IN
ROUT = R -F
×
ROUT = R - L
IN R(S)
IN
IN
4
2
2
L
-R
IN IN
where
is the signalat LMR.
Use a passive filter network as shown in Figure 9 to filter
and delay the LMR signal in more advanced applications.
4
When F
and F
= 2 (LMR, AMBLI, and AMBRI are
L(S)
R(S)
connected with the multiplier network of Figure 8), the
equations become:
Maxim Integrated
│ 20
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MAX5406
Audio Processor with Pushbutton Interface
Pseudostereo
LEFT CHANNEL
Pseudostereo creates a sound approximating stereo from
a monophonic signal. Use the equations for pseudostereo
response calculations:
INPUT
CLSP
C
CLS
(L + R
)
IN
CLSN
IN
LOUT = L + F
×
IN
L(S)
R
LS
4
V
BIAS
(L + R
)
IN
IN
SUBOUT
ROUT = R -F
×
IN R(S)
4
R
RS
R
SUB
L
+ R
4
IN
IN
C
CSUB
where
are the signals at LPR.
CSUB
Connect a pseudostereo network (F
and F
) as
L(S)
R(S)
shown in Figure 10 to filter and delay the LPR signal and
create the pseudo signal.
CRSN
RIGHT CHANNEL
INPUT
C
CRS
Click/Pop Suppression
CRSP
The click/pop suppression feature reduces the audible
noise (clicks and pops) that results from wiper transitions.
The MAX5406 minimizes this noise by allowing the wiper
position changes only when the potential across the pot is
zero. Thus, the wiper changes position only when the volt-
age at L_ is the same as the voltage at the correspond-
ing H_. Each wiper has its own suppression and timeout
circuitry (see Figure 11a). The MAX5406 changes wiper
position after 32ms or when high = low, whichever occurs
first (see Figure 11b).
Figure 12. Subwoofer Output Stage
scale. Successive pulses on MUTE toggle its setting.
Activating the mute function forces all wipers to the low
side of the potentiometer chain. Deactivating the mute
function returns the wipers to their previous settings.
MUTE is internally pulled high with a 50kΩ resistor
to V
.
LOGIC
Multiple Button Pushes
Power-On Reset
The MAX5406 ignores simultaneous presses of two or
more buttons. Pushing more than one button at the same
time does not change the state of the wipers. Additionally,
further key presses are ignored for 50ms after all keys
have been released. The MAX5406 does not respond to
any logic input until the blocking period ends.
The MAX5406 initiates power-on reset when V
below 2.2V and returns to normal operation when V
falls
LOGIC
LOGIC
= +2.7V. A power-on reset places the volume in the mute
(-90dB) state and volume wipers gradually move to -20dB
over a period of 0.7s in 2dB steps if no zero-crossing
event is detected. All other controls remain in the 0dB
position.
Bias Generator
The MAX5406 generates a midrail, (V
+ V )/2 bias
SS
Shutdown (SHDN)
DD
voltage, for use with the input amplifiers.
For normal single-supply operation and single-ended sig-
nals, connect R1_L, L1_L, R2_L, and L2_L to V and
The MAX5406 stores the current wiper setting of each
potentiometer in shutdown mode. The wipers move to
the mute position to minimize the signal out of LOUT and
ROUT. Returning from shutdown mode restores all wipers
to their previous settings. Button presses in shutdown are
ignored.
BIAS
V
to ground.
SS
Enable the V
generator by connecting CMSNS to
BIAS
V
or leave CMSNS unconnected. Disable the V
SS
BIAS
generator by forcing CMSNS to V . For proper opera-
DD
Mute Function (MUTE)
tion, do not use V
to power other circuitry.
BIAS
The MAX5406 features a mute function that sets
the volume typically 90dB attenuation relative to full
Maxim Integrated
│ 21
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MAX5406
Audio Processor with Pushbutton Interface
Subwoofer Output
Applications Information
The subwoofer output of the MAX5406 combines and
filters the left and right inputs for output to a subwoofer.
Choose the capacitor values to set the bandpass filter to
frequencies between 15Hz and 100Hz.
Bass Boost
Some simple products may not need a variable bass
tone control. It may be desirable for such products
to have a bass-boost pushbutton. Tie BASSUP and
BASSDN together to provide a bass-boost feature. When
tied together, the bass boost is toggled between 0dB and
maximum by pressing BASSUP or BASSDN.
Figure 12 shows the subwoofer output stage configura-
tion. The subwoofer output is a monophonic signal pro-
duced by adding the left and the right input signals. The
amplifier of the subwoofer output stage produces a band-
pass response. Use the following formulas to determine
the cutoff frequencies for the bandpass filter:
Unequal Source Levels
Audio sources input to the MAX5406 may not have the
same full-scale voltage swings. Use a resistor in series
with the higher voltage swing input source to reduce the
gain for that input.
1
f
f
=
=
HIGHPASS
LOWPASS
2 × π ×R_S × C
C_S
For example, to reduce the gain by half, add a 10kΩ resis-
tor in series with L1_H and R1_H, and a 20kΩ in series
with L1_L and R1_L.
1
2× π ×R
× C
CSUB
CSUB
where R is R or R and has the nominal value of
RS
_S
LS
Chip Information
PROCESS: BiCMOS
13.8kΩ, R
has the nominal value of 10.6kΩ, and
CSUB
C
is C
or C
. The external capacitors are as
C_S
CLS
CRS
shown in Figure 12.
Maxim Integrated
│ 22
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MAX5406
Audio Processor with Pushbutton Interface
Pin Configurations
TOP VIEW
CBIAS
1
2
3
4
5
6
7
8
9
48 BIAS
47 CMSNS
46 R1_H
45 R1_L
44 R2_L
43 R2_H
V
SS
L1_H
L1_L
MAX5406
L2_L
L2_H
LMR
33
25
36 35 34
32 31
29 28
30
27 26
42
V
DD
R2_H 37
24 TREBUP
23 TREBDN
22 BASSUP
21 BASSDN
AMBLI
CTL1
41 LPR
38
39
40
41
R2_L
R1_L
40 AMBRI
39 CTR1
38 CTR2
37 CBR1
36 CBR2
35 ROUT
34 CRSP
33 CRSN
32 I.C.
CTL2 10
CBL1 11
CBL2 12
LOUT 13
CLSN 14
CLSP 15
SUBOUT 16
CSUB 17
I.C. 18
R1_H
SHDN
CMSNS
20
V
BIAS 42
19
18
17
16
15
14
13
LOGIC
DGND
BALR
MAX5406
CBIAS 43
V
SS
44
45
46
47
48
L1_H
BALL
VOLUP
VOLDN
MUTE
L1_L
L2_L
L2_H
12
1
2
3
4
5
6
8
9
10 11
7
31 AMB
MUTE 19
VOLDN 20
VOLUP 21
BALL 22
30 TREBUP
29 TREBDN
28 BASSUP
27 BASSDN
26 SHDN
TQFN
BALR 23
DGND 24
25
V
LOGIC
TSSOP
Maxim Integrated
│ 23
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MAX5406
Audio Processor with Pushbutton Interface
Typical Application Circuit
V
DD
C
BIAS
V
+ V
SS
DD
X2
X2
( )
2
V
SS
MAX9761
LMR
L1_H
AMBLI
LPR AMBRI
LOUT
CBIAS
V
DD
BIAS
CMSNS
CELL PHONE, MP3,
OR ACCESSORY
CONNECTORS
LEFT
SPEAKER
STEREO IN1
BTL
R1_H
MUTE
AMB
RIGHT
SPEAKER
BTL
ROUT
V
DD
VOLDN
V
LOGIC
VOLUP
BALL
SHDN
CTR1
CTR2
DGND
MAX5406
STEREO
HEADPHONE
JACK
C
CTR
LEFT
BALR
CTL1
CTL2
CSUB
SENSE
RIGHT
C
CTL
TREBDN
TREBUP
BASSDN
BASSUP
C
CSUB
SUBOUT
L2_H
DGND
STEREO IN2 (AUX)
R2_H
V
LOGIC
CLSP CLSN DGND
CBR1CBR2 CBL1 CBL2 CRSPCRSN
V
SS
*
+2.7V TO V
DD
C
CBL
C
CRS
C
CLS
C
CBR
*OPTIONAL
TYPICAL APPLICATION CIRCUIT SHOWS MAX5406 INTERNAL BIAS VOLTAGE OPERATION AND AUXILLIARY INPUT MIXING.
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
Refer to
Application
Note 1891
48 TSSOP
48 TQFN
U48-1
21-0144
21-0155
Refer to
Application
Note 1891
T4877-6
Maxim Integrated
│ 24
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MAX5406
Audio Processor with Pushbutton Interface
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
1
5/06
4/14
Initial release
Removed automotive references on page 1
—
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2014 Maxim Integrated Products, Inc.
│ 25
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