AS1702_1 AMSCO [austriamicrosystems AG], AS1702_1 Datasheet

AS1702_1

Manufacturer Part Number

AS1702_1

Description

1.8W Single-Channel Audio Power Amplifiers

Manufacturer

AMSCO [austriamicrosystems AG]

Datasheet

1.AS1702_1.pdf (20 pages)

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A S 1 7 0 2 - A S 1 7 0 5

1 . 8 W S i n g l e - C h a n n e l A u d i o P o w e r A m p l i f i e r s

1 General Description

The AS1702 - AS1705 are single-channel differential

audio power-amplifiers designed to drive 4 and 8Ω

loads. The integrated gain circuitry of these amplifiers

and their small size make them ideal for 2.7- to 5V-pow-

ered portable audio devices.

The differential input design improves noise rejection

and provides common-mode rejection. A bridge-tied

load (BTL) design minimizes external component count,

while providing high-fidelity audio power amplification.

The devices deliver 1.8W continuous average power per

channel to a 4Ω load with less than 1% total harmonic

distortion (plus noise), while operating from a single 2.7

to 5V supply.

For reduced component designs, the devices are avail-

able with different gain levels as shown in

Table 1. Standard Products

Integrated shutdown circuitry disables the bias genera-

tor and amplifiers, and reduces quiescent current con-

sumption to less than 100nA. The shutdown input can

be set active-high or active-low. All devices contain click-

and-pop suppression circuitry that reduces audible

clicks and pops during power-up and shutdown.

The AS1702 - AS1705 are pin compatible with the

LM4895 and the MAX9718A/B/C/D. The devices are

available in a 10-pin MSOP package and a 10-pin DFN

package.

Figure 1. Simplified Block Diagram

www.austriamicrosystems.com

AS1702

AS1703

AS1704

AS1705

Model

Single Supply 2.7

Adjustable (via external components)

to 5.5V

Gain

= 0dB

= 3dB

= 6dB

SHDM

SHDN

IN+

IN-

Table

AS1702/AS1703/

AS1704/AS1705

Revision 1.47

–

2 Key Features

3 Applications

The devices 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.

- 10-pin MSOP

- 10-pin DFN

2.7 to 5.5V (V

THD+N: 1.8W into 4Ω at 1% (per Channel)

Differential Input

Adjustable Gain Option (AS1702)

Internal Fixed Gain to Reduce External Component

<100nA Low-Power Shutdown Mode

Click and Pop Suppression

Pin-Compatible to National Semiconductor LM4895

Operating Temperature Range: -40 to +85ºC

Package Types

Count (AS1703, AS1704, AS1705)

(AS1705) and Maxim MAX9718A/B/C/D

OUT+

OUT-

GND

) Single-Supply Operation

L =

4 or 8Ω

D a t a S h e e t

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