AS1701, AS1706
1.6W Audio Power Amplifiers
D a ta S he e t
1 General Description
The AS1701 and AS1706 are 1.6W bridged audio power
amplifiers that provide excellent circuit reliability, provid-
ing a very low-cost solution by eliminating external com-
ponents when used with 2.7 to 5.5V-powered circuits.
The devices have superb total harmonic distortion
(THD) at high-power output and excellent power supply
rejection with 4- and 8Ω-loads.
Integrated over-temperature and over-current protection
circuitry switch the devices off in case of an output
short-circuit. A digital input allows the devices to auto-
matically switch into shutdown mode. Click- and pop-
suppression circuitry reduces audible clicks and pops
during power-up and shutdown. The gain (A
V
) of the
devices is controlled using external resistors.
The AS1701/AS1706 are available in an 8-pin MSOP
package.
2 Key Features
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2.7 to 5.5V (V
DD
) Single-Supply Operation
Very High PSRR: Greater Than 65dB @ 217Hz
THD+Noise: 1.6W into 4Ω at 1%
No Output Coupling Capacitors Required
External Gain Configuration Capability
Low-Power Shutdown Mode: 10nA
Click and Pop Suppression
Over-Temperature and Over-Current Protection
Operating Temperature Range: -40 to +85°C
8-pin MSOP Package
3 Applications
The AS1701/AS1706 are ideal as audio front-ends for
battery powered audio devices such as MP3 and CD
players, mobile phones, PDAs, portable DVD players,
and any other hand-held battery-powered device.
Figure 1. Typical Configuration Block Diagram
V
DD
+
10µF
20kΩ
R
F
C
S
6
V
DD
Audio
Input
C
IN
0.33µF
R
IN
20kΩ
4
IN-
3
IN+
–
+
50kΩ
–
40kΩ
5
OUT+
40kΩ
RL =
4 or 8Ω
8
OUT-
2
0.1 to
+
1µF C
B
BIAS
V
DD
/2
+
Av = -1
1
SHDN
Bias
50kΩ
AS1701/
AS1706
7
GND
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