AS1701, AS1706

1.6W Audio Power Amplifiers

Product Brief

© 1997-2005, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved.

www.austriamicrosystems.com

Revision 1.11

1 - 2

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 8

Ω-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

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

!

!

Very High PSRR: Greater Than 65dB @ 217Hz

!

THD+Noise: 1.6W into 4

Ω 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.

RL =

4 or 8

Ω

40k

Ω

40k

Ω

50k

Ω

50k

Ω

Bias

20k

+

–

10µF

Av = -1

0.1 to

1µF

+

+

AS1701/

AS1706

GND 7

2

BIAS

8

OUT-

5

OUT+

6

1

SHDN

20k

Ω

+

–

0.33µF

Audio

Input

4

IN-

3

IN+