SM6802AB [NPC]
Class-D Stereo Amplifier for Portable Device; D类立体声放大器器用于便携式设备
| 型号： | SM6802AB |
| 厂家： | 
NIPPON PRECISION CIRCUITS INC |
| 描述： | Class-D Stereo Amplifier for Portable Device |
| 文件： | 总15页 (文件大小：213K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SM6802A
Class-D Stereo Amplifier for Portable Device
OVERVIEW
The SM6802A is an analog-input, class-D stereo amplifier. Class-D operation provides high efficiency and low
power consumption. The device also incorporates an original real-time operation dynamic range compression
function that effectively suppresses the distortion in the saturation level region output by soft-clipping, boost-
ing the average sound pressure from the speaker during playback. It also incorporates an input equalizer pin for
output speaker frequency characteristics adjustment. These features make the device ideal for use in mobile
telephones and speaker applications requiring miniaturization and high-efficiency. The output stage has a BTL
output configuration where the output waveform inverts only the modulation components, enabling direct drive
connection, without using an LC filter, to a dynamic speaker. The device is available in miniature 20-pin QFN
packages, and requires only a peripheral chip capacitor to form a miniature amplifier circuit.
FEATURES
PINOUT
ꢀ Operating supply voltage: 2.7 to 5.5V
ꢀ Low current consumption: 6mA
(VDD1 = VDD2 = VDD3 = 3.6V)
ꢀ Output power: 0.7W + 0.7W
(VDD1 = VDD2 = VDD3 = 3.6V, 8Ω load)
ꢀ Output fundamental frequency: 125kHz
ꢀ Gain
(Top view)
20 19 18 17 16
1
2
3
4
5
15
14
13
12
11
LEQP
VDD3
LOUTP
VSS2
ROUTP
VDD2
LIN
VDD1
RIN
• 6dB (Normal)
• 15dB to 6dB automatic adjustment in response
to the input level
REQP
6
7 8 9 10
(Dynamic range compression mode)
ꢀ Silicon-gate CMOS process
ꢀ Package: 20-pin QFN
APPLICATIONS
PACKAGE DIMENSIONS
ꢀ Cellular phone
ꢀ PDA
(Unit: mm)
ꢀ Digital still camera
4.20 0.20
4.00 0.10
ORDERING INFORMATION
Device
Package
SM6802AB
20-pin QFN
1
0.60 0.10
0.50
0.05
0.22 0.05
0.05
M
NIPPON PRECISION CIRCUITS INC.—1
SM6802A
BLOCK DIAGRAM
LEQP LEQN TESTN DRCN PWDN MUTEN
VDD3
−
LIN
BUFFER
BUFFER
LEVEL SHIFTER
LOUTP
LOUTN
+
PWM
Modulator
LEVEL SHIFTER
−
+
MUTE,POWERDOWN,
PROTECTION
BIAS
VREF
VREF1
RIN
OSC
VSS2
−
+
BUFFER
BUFFER
LEVEL SHIFTER
LEVEL SHIFTER
ROUTP
REQP
REQN
PWM
Modulator
−
ROUT
+
VSS1 VDD1
VDD2
PIN DESCRIPTION
*1
*2
Number
Name
LEQP
LIN
I/O
Function
1
2
I
I
Lch equalizer network connection
Lch signal input
3
VDD1
RIN
–
I
Supply (input system)
4
Rch signal input
5
REQP
REQN
VSS1
I
Rch equalizer network connection
Rch equalizer network connection
Ground (input system)
6
I
7
–
I
8
PDWN
DRCN
ROUTN
VDD2
ROUTP
VSS2
Power-down control (active LOW)
9
I
Dynamic range compression mode setting (HIGH: normal operation, LOW: compression mode)
Rch speaker minus (–) output
10
11
12
13
14
15
16
17
18
19
20
O
–
Supply (output stage)
O
–
Rch speaker plus (+) output
Ground (output stage)
LOUTP
VDD3
LOUTN
MUTEN
TESTN
VREF1
LEQN
O
–
Lch speaker plus (+) output
Supply (output stage)
O
I
Lch speaker minus (–) output
Mute control (active LOW)
Ip
–
Test pin (HIGH: normal operation, LOW: test mode)
Reference voltage 1 (bias voltage)
Lch equalizer network connection
O
*1. V
= VDD1, V
*2. Ip = input pin with built-in pull-up resistor
= VDD2 = VDD3, V = VSS1 = VSS2
DDP SS
DDS
NIPPON PRECISION CIRCUITS INC.—2
SM6802A
SPECIFICATIONS
Absolute Maximum Ratings
Parameter
Symbol
Rating
Unit
V
V
−0.3 to 4.6
−0.3 to 7.0
0
DDS
Supply voltage range
V
V
DDP
V
V
SS
Input voltage range
Storage temperature range
Output current
V
V
− 0.3 to V
+ 0.3
V
IN
SS
DDS
T
−55 to 125
°C
mA
mW
STG
I
600
O
*1
Power dissipation
P
1500 (Ta = 25°C)
D
*1. When mounted on a 3.5cm × 3.5cm board, the power dissipation is related to the operating temperature by the
following equation.
ꢀ Maximum junction temperature: T
= 125°C
MAX
ꢀ Operating ambient temperature: Ta = [°C]
ꢀ Thermal resistance: θ = 66.6°C/W
J
(TMAX − Ta)
PD =
θJ
1.6
1.4
1.2
1.500
1
0.8
0.6
0.4
0.2
0
1.200
0.900
0.600
25
35
45
55
65
75
85
Operating temperature [°C]
Recommended Operating Conditions
V
= VSS1 = VSS2 = VSS3 = 0V, V
=VDD1, V
= VDD2, VDD3 unless otherwise noted.
SS
DDS
DDP
Parameter
Symbol
Rating
Unit
V
Supply voltage 1
V
2.7 to 3.6
2.7 to 5.5
−40 to 85
DDS
Supply voltage 2
V
V
DDP
Operating ambient temperature
Ta
°C
Note. V
≥ V
DDS
DDP
NIPPON PRECISION CIRCUITS INC.—3
SM6802A
Electrical Characteristics
DC Characteristics
VSS1 = VSS2 = 0V, VDD1 = 2.7 to 3.6V, VDD2 = VDD3 = 2.7 to 5.5V, Ta = −40 to 85°C unless otherwise
noted.
Rating
Parameter
Pin
Symbol
Conditions
Unit
min
–
typ
5.0
0.1
0.6
2.0
0.1
0.1
–
max
7.0
0.5
2.0
7.0
0.3
0.3
–
I
(Note 1)
(Note 2)
mA
µA
mA
mA
µA
µA
V
DD1A
VDD1
I
–
DD1S
VDD2 = VDD3 = 3.6V
VDD2 = VDD3 = 5V
VDD2 = VDD3 = 3.6V
VDD2 = VDD3 = 5V
–
Current consumption
I
(Note 1)
(Note 2)
DDAA
–
VDD2
–
I
DDAS
–
V
HIGH level
LOW level
HIGH level
LOW level
0.7V
DD1
IH1
Input voltage 1
Input voltage 2
TESTN, DRCN
MUTEN, PDWN
V
–
1.6
–
–
0.3V
V
IL1
DD1
V
–
–
V
IH2
V
–
0.4
V
IL2
TESTN, DRCN,
MUTEN, PDWN
Input current
I
V
V
= V
= V
−
−
25
–
90
µA
µA
IL1
IN
IN
SS
TESTN, DRCN,
MUTEN, PDWN
Input leakage current
I
1.0
LH1
DD1
Note 1. MUTEN = HIGH, PDWN = HIGH, input and VREF1 connected by 600Ω, DRCN = HIGH, no-load output
Note 2. MUTEN = LOW, PDWN = LOW, input and VREF1 connected by 600Ω, DRCN = HIGH, no-load output
NIPPON PRECISION CIRCUITS INC.—4
SM6802A
AC Analog Characteristics
VDD1 = VDD2 = VDD3 = 3.6V, VSS1 = VSS2 = 0V, 0.708Vrms analog input amplitude, 1kHz input signal
frequency, Ta = 25°C, "Measurement Block Diagram", "Measurement Conditions", "Measurement Circuit",
DRCN = PDWN = MUTEN = HIGH, unless otherwise noted.
Analog Input Characteristics (LIN, RIN)
Rating
Parameter
Symbol
Conditions
Unit
min
–
typ
0.708
0.142
60
max
–
Reference input amplitude 1
Reference input amplitude 2
Input resistance
V
P
P
= 0.25W
= 0.05W
Vrms
Vrms
kΩ
AI1
O
O
V
–
–
AI2
R
42
0.7
78
1.3
IN
Input clipping voltage
V
P
= 0.5W
1
Vrms
CLP
O
Analog Output Characteristics (LOUTP, LOUTN, ROUTP, ROUTN)
Rating
typ
Parameter
Symbol
Conditions
Unit
min
max
DRCN = HIGH,
input amplitude = 0.1Vrms
Voltage gain 1
A
4.0
6.0
15.0
78
8.0
dB
dB
1
DRCN = LOW,
input amplitude = 0.05Vrms
Voltage gain 2
A
13.0
–
17.0
120
2
DRCN = HIGH,
input and VREF1 connected by 600Ω
Residual noise voltage
V
µVrms
NS
Total harmonic distortion + noise
Channel crosstalk
THD + N
P
= 0.2W, reference input amplitude 1
–
0.4
–70.0
0.7
1.0
–
%
dB
O
CC
(Note 1)
–60.0
0.6
Maximum output power
Mute-mode output voltage
P
Output power when THD = 10%
Output power when MUTEN = LOW
0.8
–
W
OMAX
V
–90.0
–110
dBV
MUTE
V
– 0.2
V
V
DDP
+ 0.2
DDP
DDP
HIGH-level output voltage
V
V
OH
– 0.02
0.02
83
LOW-level output voltage
Efficiency
V
0
0.2
–
V
OL
E
Maximum output power conditions
(Note 2)
80
–
%
dB
EF
Ripple rejection ratio 1
PSRR1
–65
–
Note 1. Cross-channel leakage signal with standard voltage input on one channel only.
Note 2. DRCN = HIGH, 217Hz ripple frequency, 0.2Vrms ripple amplitude on VDD1/VDD2, input and VREF1 connected by 600Ω.
Reference Voltage Characteristics (VREF1)
Rating
Parameter
Symbol
Unit
min
typ
0.5V
max
0.55V
Reference output voltage 1
V
0.45V
V
REF1
DDS
DDS
DDS
NIPPON PRECISION CIRCUITS INC.—5
SM6802A
Measurement Block Diagram
40µH
40µH
BALANCED INPUT +
SPOUT POS
1µF
1µF
EVALUATION
BOARD
AUDIO
ANALYZER
8Ω
BALANCED INPUT −
SPOUT NEG
Measurement Conditions
Audio Analyzer
(Audio Precision System Two Cascade)
Built-in Filters
Parameter
Low-pass filter (20kHz) ON
High-pass filter (22Hz) ON
Excluding residual noise
Residual noise voltage
Low-pass filter (20kHz) ON
High-pass filter (22Hz) ON
A-weighted
NIPPON PRECISION CIRCUITS INC.—6
SM6802A
Measurement Circuit
LEQP LEQN TESTN
MUTEN
SW3*
SW4*
H
L
H
L
C7
150p
C9
1µ
R9*
SPOUT NEG
POWER VDD
LEQP
LIN
VDD3
POWER VDD (2.7 to 5.5V)
C10 1µ
R10*
C1
LIN
SPOUT POS
LOUTP
VSS2
SIGNAL INPUT
1µ
POWER VSS (0V)
SPOUT POS
VDD1
C2
VDD1
RIN
C11 1µ
ROUTP
RIN
R11*
SIGNAL INPUT
1µ
REQP
VDD2
R12*
SPOUT NEG
SW1* SW2*
C8
H
L
H
L
150p
ANALOG VSS (0V)
REQN
PDWN
REQP
VSS1
DRCN
SIGNAL VSS (0V)
Note. *C3, C4, C5, C6: not inserted
*R1, R2, R3, R4, R5, R6, R7, R8: not inserted
*R9, R10, R11, R12: series resistors for dielectric speaker
*SW1: HIGH = Power on, LOW = Power off
*SW2: HIGH = DRC off, LOW = DRC on
*SW3: LOW = Test, HIGH = Normal
*SW4: LOW = Mute on, HIGH = Mute off
NIPPON PRECISION CIRCUITS INC.—7
SM6802A
FUNCTIONAL DESCRIPTION
Power-down (PDWN)
The device enters power-down mode when PDWN goes LOW. When powered-down, the outputs become high
impedance and the internal oscillation stops. In power-down mode, the MUTEN pin should be held LOW.
Mute (MUTEN)
Mute operation occurs when MUTEN goes LOW. In mute mode, the outputs become high impedance. During
mute operation, the protection circuit operation is disabled, but the outputs are protected against output short
circuits by their high impedance state. When power is applied, MUTEN should be held LOW for a short inter-
val, shown in the timing diagram below, to prevent pop noise from the speaker. Also, applying and releasing
mute operation after power is applied can occur at high speed without generating pop noise.
min. 40msec
PDWN
MUTEN
Note. VREF1 load capacitance = 1µF
Protection Circuit
The protection circuit operates if there is an output short-circuit to the supply, short-circuit to ground, or other
excessive load abnormal condition lasting longer than approximately 1µs. Normal operation resumes after
approximately 5 seconds. When the protection circuit becomes active, the outputs become high impedance.
NIPPON PRECISION CIRCUITS INC.—8
SM6802A
Input Equalizer (LIN, LEQP, LEQN, RIN, REQP, REQN)
An input equalizer network can be connected to pins LIN, LEQP and LEQN (RIN, REQP and REQN), as
shown in the input equivalent circuit and equalizer circuit below.
R01
R04
R02 C02
R03 C03
C04
1
20
LEQN
(REQN)
LEQP
(REQP)
60k
60k
C01
2
−
+
IN'
LIN
(RIN)
VREF1
The frequency response of the equalizer circuit is given by the following equation, where ƒ is the frequency.
1
1
1
1
R04
+
+
+ 2πƒC04
60000
1
R03 +
2πƒC03
Response = 20 × log10
[dB]
1
1
+
2πƒC01
1
1
R01
1
1
2πƒC02
+
+
60000
R02 +
Dynamic Range Compression Mode (DRCN)
The dynamic range compression mode is set when DRCN is LOW. When a compression mode is used, the gain
for small input signals is increased while large input signals are converted using a curve that performs soft-clip-
ping. This increases the average sound pressure level emitted from the speaker during playback.
-40 -35 -30 -25 -20 -15 -10 -5
0
5
10
10
5
0
DRC mode
-5
-10
-15
-20
-25
-30
-35
-40
normal mode
Input [dBV]
NIPPON PRECISION CIRCUITS INC.—9
SM6802A
TYPICAL APPLICATION CIRCUITS
Dynamic Speaker
LC-type LPF Connection
47µH
47µH
OUTPUT
SOUND
IN SPOUT POS
1µF
1µF
SM6802
GENERATOR IC
(One side of L/R channels)
SPOUT NEG
Direct Connection
LC filter may be required for the measure against EMI, if the wiring between this device and load is long.
OUTPUT
IN SPOUT POS
SM6802
SOUND
GENERATOR IC
(One side of L/R channels)
SPOUT NEG
Dielectric Speaker
A dielectric speaker is capacitive in nature, and therefore requires output resistor connection.
4Ω
OUTPUT
IN SPOUT POS
*
SM6802
SOUND
GENERATOR IC
(One side of L/R channels)
4Ω
SPOUT NEG
* Dielectric speaker
Taiyo Yuden MLS20070, MLS23070, MLS25070 or similar
NIPPON PRECISION CIRCUITS INC.—10
SM6802A
Mounting Circuits
Connection to LC Filter
VDD2
VSS2
VDD3
1µF
1µF
VDD1
VSS1
V
CC
1µF
SM6802
LC filter
LOUTP
LOUTN
ROUTP
ROUTN
Z0
Speaker
Speaker
V
SS
LC filter
LC filter
LC filter
Direct Connection to Load
VDD2
10µF
10µF
VSS2
VDD3
VDD1
VCC
1µF
SM6802
LOUTP
LOUTN
ROUTP
ROUTN
Z0
Speaker
VSS1
VSS
Speaker
Note. As for the wiring to VDD1, VDD2, VDD3, VSS1, and VSS2, we recommend to wire from the power supply block. The recommended value of internal
impedance (Z0) is approximately less than 1/40 of load resistance.
NIPPON PRECISION CIRCUITS INC.—11
SM6802A
TYPICAL CHARACTERISTICS
Measurement conditions: Refer to “Analog Output Characteristics”.
Measurement circuit: Refer to “Measurement Circuit”.
+10
+7.5
+5
DRC
+2.5
+0
-2.5
-5
NORMAL
-7.5
-10
-12.5
-15
-17.5
-20
-30
-27.5
-25
-22.5
-20
-17.5
-15
-12.5
-10
-7.5
-5
-2.5
+0
+2.5
+5
Input [dBV]
Input vs. Output
1.8
1.5
1.2
0.9
0.6
0.3
0
2.5
3
3.5
4
4.5
5
5.5
Supply voltage [V]
Supply voltage vs. Output power
100
10
5
50
20
10
5
2
1
Output power
THD + N
500m
2
1
200m
100m
0.5
50m
0.2
0.1
20m
10m
5m
0.05
0.02
0.01
2m
1m
-25
-22.5
-20
-17.5
-15
-12.5
-10
-7.5
-5
-2.5
+0
+2.5
+5
Input [dBV]
Input vs. THD + N and output power
NIPPON PRECISION CIRCUITS INC.—12
SM6802A
-70
-75
-80
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency [Hz]
Residual noise vs. Frequency
10
5
+6
+5
+4
THD + N
2
1
+3
+2
+1
-0
-1
-2
-3
-4
-5
0.5
0.2
0.1
0.05
0.02
0.01
Output
0.005
0.002
0.001
-6
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency [Hz]
THD + N and output voltage vs. Frequency
+0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
PSRR
10
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency [Hz]
PSSR vs. Frequency
+0
-20
-40
-60
-80
-100
-120
-140
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency [Hz]
Channel crosstalk vs. Frequency
NIPPON PRECISION CIRCUITS INC.—13
SM6802A
ASSEMBLING PRECAUTION
Package corner metals are not IC I/O pins. Don’t connect any lines to these corner metals.
Bottom view
FOOTPRINT PATTERN
The optimum footprint varies depending on the board material, soldering paste, soldering method, and equip-
ment accuracy, all of which need to be considered to meet design specifications.
(Unit: mm)
Package
HE
HD
e
b3
l1
l2
QFN-20
4.2
4.2
0.5
0.30 0.05
0.20 0.05
0.70 0.05
b3
e
e
b3
l2
l1
l1
l2
HD /2
HD
NIPPON PRECISION CIRCUITS INC.—14
SM6802A
Please pay your attention to the following points at time of using the products shown in this document.
The products shown in this document (hereinafter “Products”) are not intended to be used for the apparatus that exerts harmful influence on
human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such
use from NIPPON PRECISION CIRCUITS INC. (hereinafter “NPC”). Customers shall be solely responsible for, and indemnify and hold NPC
free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves
the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or
warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third
parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this
document. Any descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the
Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing
or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in
compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested
appropriately take steps to obtain required permissions or approvals from appropriate government agencies.
NIPPON PRECISION CIRCUITS INC.
15-6, Nihombashi-kabutocho, Chuo-ku,
Tokyo 103-0026, Japan
Telephone: +81-3-6667-6601
Facsimile: +81-3-6667-6611
http://www.npc.co.jp/
Email: sales@npc.co.jp
NC0409CE 2005.11
NIPPON PRECISION CIRCUITS INC.—15
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