AS1701, AS1706
1.6W Audio Power Amplifiers
www.austriamicrosystems.com/Audio/Amps/AS1701_06 Revision 1.53 1 - 18
Datasheet
1 General Description
The AS1701 and AS1706 are 1.6W bridged audio power amplifiers
that provide excellent circuit reliability, providing a very low-cost solu-
tion by eliminating external components 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 automatically 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.
Figure 1. Typical Configuration Block Diagram
2 Key Features
2.7 to 5.5V (VDD) 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 pow-
ered audio devices such as MP3 and CD players, mobile phones,
PDAs, portable DVD players, and any other hand-held battery-pow-
ered device.
RL =
4 or 8Ω
40kΩ
40kΩ
50kΩ
50kΩ
V
DD/2
Bias
20kΩ
RF
VDD
+
–
CS10µF
Av = -1
CB
0.1 to
1µF
+
+
AS1701/
AS1706
GND 7
2
BIAS
8
OUT-
5
OUT+
6 VDD
1
SHDN
20kΩ
R
IN
+
–
CIN
0.33µF
Audio
Input
4
IN-
3
IN+
