AP4809M [DIODES]
Audio Amplifier, 2 Func, CMOS, PDSO8,;
| 型号： | AP4809M |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | Audio Amplifier, 2 Func, CMOS, PDSO8, 放大器 光电二极管 商用集成电路 |
| 文件： | 总9页 (文件大小：233K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP4809
Stereo Headphone Amplifier With Shutdown Mode
Features
General Description
- Operate from 3V to 7V Single Supply Voltage
- High Signal-to-Noise ratio
The AP4809 is a stereo power amplifier in an 8-pin
SOP package capable of delivering 70mW
continuous average power per channel into 32Ω
loads with less than 0.1% (THD+N) from a 5V power
supply. Amplifier gain is externally configured by
means of two resistors per input channel. It was
designed specially to provide high quality output
- High Slew Rate
- Large Output Voltage Swing
- Low Distortion
- Low Power Consumption
- Switch On/Off Click suppression
- Excellent Power Supply Ripple Rejection
- SOP-8, PDIP-8 and MSOP-8 Pb-Free Packages
power with
a
minimal amount of external
components and is therefore optimally suited for
low-power portable systems.
Applications
- CD-ROM, DVD-ROM
- MP3 Player
- Battery Powered Devices
- Personal Computers
Pin Descriptions
Pin Assignments
(Top View)
Pin
No.
Pin Name
Description
1
Vo1
VDD
Vo2
IN2-
SHUTDOWN
8
7
6
5
1
2
Vo1
IN1-
Output 1
IN1- 2
Inverting input 1
3
4
BYPASS
GND
Tap to voltage divider for
3
4
5
BYPASS
GND
internal mid-rail bias supply.
Ground
Logic low to put chip in
SOP-8L/PDIP-8L
SHUTDOWN
shutdown mode.
6
7
8
IN2-
Vo2
VDD
Inverting input 2
Output 2
Positive power supply
(Top View)
Vo1
IN1-
VDD
Vo2
IN2-
1
8
7
6
2
3
4
BYPASS
GND
5 SHUTDOWN
MSOP-8L
Ordering Information
AP4809 X X
Package
Packing
Blank : Tube
: Taping
S : SOP-8L
N: PDIP-8L
M: MSOP-8L
A
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. 1.0 Sep 29, 2004
1/9
AP4809
Stereo Headphone Amplifier With Shutdown Mode
Absolute Maximum Ratings (TA=25oC)
Symbol
Parameter
Max.
Unit
VDD
TJ
TS
Supply Voltage
Junction Temperature
Soldering Temperature, 10 Seconds
Operating Ambient Temperature Range
Storage Temperature Range
ESD Susceptibility (Note 1)
7
150
250
V
oC
oC
oC
oC
V
TA
-40 to 85
-65 to 150
2000
TSTG
VESD
PD
Package Power Dissipation
500
mW
Note 1: Human Body Model, C=100pF, R=1500Ω, 3 positive pulses and 3 Negative Pulses.
Electrical Characteristics (TA=25oC, VDD=5V, fi=1KHz, RL=32Ω)
Symbol
VDD
Parameter
Supply Voltage
Test Condition
Min.
2.5
Typ.
-
Max.
5.5
Unit
V
IDD
PTOT
Supply Current
Total Power Dissipation
VI(OS) Input Offset Voltage
VIN=0V, IO=0A
VIN=0V, IO=0A
VIN=0V
-
-
-
-
0
-
-
-
0.9
-
0.24
0.12
-
3
10
5
10
-
80
80
-
5
20
-
-
3.5
-
-
0.7
-
-
4.43
4.69
-
mA
mW
mV
pA
V
dB
mA
V
IBIAS
VCM
GV
Input Bias Current
Common Mode Voltage
Open-Loop Voltage Gain
Max. Output Current
RL=5KΩ
THD+N < 0.1%
Shutdown Pin Voltage
Shutdown Pin Voltage
IO
VSHUT Shutdown Enabled
VSHUT Shutdown Disabled
-
V
Ω
RO
VO
Output Resistance
0.3
-
-
75
80
RL=16Ω, THD+N=0.1%
RL=32Ω, THD+N=0.1%
V
V
dB
dB
Output Voltage Swing
PSRR Power Supply Ripple Rejection
αS Channel Separation
RL=32Ω
-
-
RL=32Ω
THD+N Total Harmonic Distortion + Noise
SNR Signal-TO-Noise Ratio
-
0.02
-
%
VO=3.2VP-P (at 0 dB)
VO=3.2VP-P (at 0 dB)
Open Loop, RL=5KΩ
RL=32Ω, THD+N=0.1%
Unity Gain Inverting
-
-
-
-
105
6
75
6
-
-
-
-
dB
fG
PO
SR
Unity Gain Frequency
Output Power
Slew Rate
MHz
mW
V/µs
Anachip Corp
www.anachip.com.tw
Rev. 1.0 Sep 29, 2004
2/9
AP4809
Stereo Headphone Amplifier With Shutdown Mode
Typical Performance Characteristics
Anachip Corp
www.anachip.com.tw
3/9
Rev. 1.0 Sep 29, 2004
AP4809
Stereo Headphone Amplifier With Shutdown Mode
Typical Performance Characteristics
Test Circuit
Rf
VDD
Ω
450K
DD / 2
Ω
450K
8
VDD
CS
C
S
V
Ri
100uF
0.1uF
2
3
IN1-
Vi1
Vi2
-
+
Vo1
1
Vo1
C
I
C
C
10uF
20K
Ω
100
Ω
Ω
BYPASS
220uF
C
B
10uF
Ri
+
-
Vo2
7
Vo2
6
5
IN2-
CC
20K
100
Ω
C
I
220uF
10uF
From Shutdown
Control Circuit
Shutdown
Control
SHUTDOWN
4
Rf
Anachip Corp
www.anachip.com.tw
Rev. 1.0 Sep 29, 2004
4/9
AP4809
Stereo Headphone Amplifier With Shutdown Mode
Application Information
1. Input Capacitor, CI
3. Mid-rail Bypass Capacitor, CB
In the typical application, an input capacitor, Ci, is
required to allow the amplifier to bias the input signal
to the proper dc level for optimum operation. In this
case, Ci and Ri form a high-pass filter with the corner
frequency determined in following equation (1).
In the consideration of reducing the start-up pop, the
mid-rail voltage should rise at a sub-sonic rate; that
is, less than the rise time of 20Hz waveform and
slower than the charging rate of both Ci & CC. The
relationship shown in equation (3) should be
maintained to keep the noise as low as possible.
Where CB is the value of bypass capacitor and
RSOURCE is the equivalent source impedance of the
voltage divider (the parallel combination of the two
resistors)
1
fco(highpass)
=
(1)
2π
R C
i i
The value of Ci is important to consider, as it directly
affects the low frequency performance of the circuit.
Consider the example where Ri is 15kΩ and the
specification calls for a flat bass response down to
20Hz. Equation (1) is reconfigured as below:
1
1
1
<
< <
(3)
×
CB RSOURCE
C R
i i
RLRC
The bypass capacitor, CB, serves several important
functions. During start-up, CB determines the rate at
which the amplifier starts up. This helps to push the
start-up pop noise into the sub-audible range (so
slow it can not be heard). The second function is to
reduce noise produced by the power supply caused
by coupling into the output drive signal. This noise is
from the mid-rail generation circuit internal to the
amplifier. The capacitor is fed from the resistor
divider with equivalent resistance of RSOURCE. On
selection of bypass capacitor, CB, ceramic or
tantalum low-ESR capacitors are recommended for
the best THD and noise performance.
1
Ci =
(2)
2π
R f
i co(highpass)
In this example, Ci is 0.5 µF, so one would likely
choose a value in the range of 1µF to 2.2µF. A
further consideration for this capacitor is the leakage
path from the input source through the input network
(Ri, Ci) and the feedback resistor (Rf) to the load.
This leakage current creates a dc offset voltage at
the input to the amplifier that reduces useful
headroom, especially in high-gain applications (>10).
For this reason a low-leakage tantalum or ceramic
capacitor is the best choice. When polarized
capacitors are used, the positive side of the
capacitor should face the amplifier input in most
applications, as the dc level there is held at VDD/2,
which is likely higher than the source dc level. It is
important to confirm the capacitor polarity in the
application.
4. Output Coupling Capacitor, CC
In the typical single-supply single-ended (SE)
configuration, an output coupling capacitor (CC) is
required to block the dc bias at the output of the
amplifier, thus preventing dc currents in the load. As
with the input coupling capacitor, the output coupling
capacitor and impedance of the load form a
high-pass filter governed by equation (4).
2. Power Supply Decoupling, CS
The AP4809 is a high-performance CMOS audio
amplifier that requires adequate power supply
decoupling to ensure that the output total harmonic
distortion (THD) is as low as possible. Power supply
decoupling also prevents oscillations for long lead
lengths between the amplifier and the speaker. The
optimum decoupling is achieved by using two
capacitors of different types that target different
types of noise on the power supply leads. For higher
frequency transients, spikes, or digital hash on the
line, a good low equivalent-series-resistance (ESR)
ceramic capacitor, typically 0.1µF, placed as close
as possible to the device VDD lead, works best. For
filtering lower-frequency noise signals, a larger
aluminum electrolytic capacitor of 10µF or greater
placed near the power amplifier is recommended.
1
f(out high)
=
(4)
2π
RL CC
The main disadvantage, from
a
performance
standpoint, is that the typically small load
impedances drive the low-frequency corner higher.
Large values of CC are required to pass low
frequencies into the load.
The output coupling capacitor required in
single-supply SE mode also places additional
constraints on the selection of other components in
the amplifier circuit. With the rules described earlier
still valid, add the following relationship:
Anachip Corp
www.anachip.com.tw
Rev. 1.0 Sep 29, 2004
5/9
AP4809
Stereo Headphone Amplifier With Shutdown Mode
Application Information (Continued)
4.1 Output Pull-Down Resistor, RC + RO
4.2 Using Low-ESR Capacitors
Placing a 100Ω resistor, RC, from the output side of
the coupling capacitor to ground insures the coupling
capacitor, CC, is charged before a plug is inserted
into the jack. Without this resistor, the coupling
capacitor would charge rapidly upon insertion of a
plug, leading to an audible pop in the headphones.
Placing a 20kΩ resistor, RO, from the output of the IC
to ground insures that the coupling capacitor fully
discharges at power down. If the supply is rapidly
cycled without this capacitor, a small pop may be
audible in 10kΩ loads.
Low-ESR capacitors are recommended throughout
this application. A real capacitor can be modeled
simply as a resistor in series with an ideal capacitor.
The voltage drop across this resistor minimizes the
beneficial effects of the capacitor in the circuit. The
lower the equivalent value of this resistance, the
more the real capacitor behaves like an ideal
capacitor.
Marking Information
( Top View )
8
5
(Top View)
Logo
YM X
Logo
Part number
AP4809
ID code: internal
Date code:
Y: Year : 0~9
M: Month (A~L)
Part number
4809
YY WW X
ID code: internal
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
1
4
SOP-8L/PDIP-8L
MSOP-8L
Anachip Corp
www.anachip.com.tw
Rev. 1.0 Sep 29, 2004
6/9
AP4809
Stereo Headphone Amplifier With Shutdown Mode
Package Information
(1) Package Type: SOP-8L
L
VIEW "A"
D
0.015x45
VIEW "A"
7 (4X)
7 (4X)
e
B
y
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
1.40
0.10
1.30
0.33
0.19
4.80
3.70
-
Nom.
1.60
-
Max.
1.75
0.25
1.50
0.51
0.25
5.30
4.10
-
6.20
1.27
0.10
8O
Min.
Nom.
0.063
-
Max.
A
A1
A2
B
0.055
0.040
0.051
0.013
0.0075
0.189
0.146
-
0.069
0.100
0.059
0.020
0.010
0.209
0.161
-
0.244
0.050
0.004
8O
1.45
0.41
0.20
5.05
3.90
1.27
5.99
0.71
-
0.057
0.016
0.008
0.199
0.154
0.050
0.236
0.028
-
C
D
E
e
H
L
5.79
0.38
-
0.228
0.015
-
y
0O
-
0O
-
θ
Anachip Corp
www.anachip.com.tw
Rev. 1.0 Sep 29, 2004
7/9
AP4809
Stereo Headphone Amplifier With Shutdown Mode
Package Information(Continued)
(2) Package Type: PDIP-8L
D
E-PIN O0.118 inch
E
(4X)
15
PIN #1 INDENT O0.025 DEEP 0.006-0.008 inch
C
7
(4X)
eB
B
B1
e
S
B2
Dimensions in millimeters
Dimensions in inches
Symbol
Min.
-
Nom.
-
Max.
5.33
-
Min.
Nom.
-
Max.
A
A1
A2
B
-
0.210
-
0.38
3.1
-
0.015
0.122
0.014
0.055
0.032
0.008
0.355
0.300
0.242
-
-
3.30
0.46
1.52
0.99
0.25
9.27
7.94
6.35
2.54
3.3
3.5
0.130
0.018
0.060
0.039
0.010
0.365
0.313
0.250
0.100
0.130
0.350
0.033
0.138
0.022
0.065
0.045
0.014
0.375
0.325
0.258
-
0.36
1.4
0.56
1.65
1.14
0.36
9.53
8.26
6.55
-
B1
B2
C
0.81
0.20
9.02
7.62
6.15
-
2.92
8.38
0.71
D
E
E1
e
L
3.81
9.40
0.97
0.115
0.330
0.028
0.150
0.370
0.038
eB
S
8.89
0.84
Anachip Corp
www.anachip.com.tw
Rev. 1.0 Sep 29, 2004
8/9
AP4809
Stereo Headphone Amplifier With Shutdown Mode
Package Information (Continued)
(3) Package Type: MSOP-8L
D
GAGE PLANE
L
DETAIL A
φ
PIN 1 INDICATOR 0.45 mm
×
0.038DP SURFACE POLISHED
12 (4x)
DETAIL A
θ
e
b
y
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
0.81
0.05
0.76
0.28
0.13
2.90
4.80
2.90
-
Nom.
1.02
-
Max.
1.22
0.15
0.97
0.38
0.23
3.10
5.00
3.10
-
Min.
Nom.
0.040
-
Max.
A
A1
A2
b
C
D
E
E1
e
L
y
θ
0.032
0.002
0.030
0.011
0.005
0.114
0.189
0.114
-
0.048
0.006
0.038
0.015
0.009
0.122
0.197
0.122
-
0.86
0.30
0.15
3.00
4.90
3.00
0.65
0.53
-
0.034
0.012
0.006
0.118
0.193
0.118
0.0256
0.021
-
0.40
-
0.66
0.076
6º
0.016
-
0.026
0.003
6º
0º
3º
0º
3º
Anachip Corp
www.anachip.com.tw
Rev. 1.0 Sep 29, 2004
9/9
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