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APA4835

Stereo 2.8W Audio Power Amplifier with DC Volume Control and Selectable Gain

Anpec Electronics 

APA4835

Features

Stereo 2.8W Audio Power Amplifier with DC Volume Control

and Selectable Gain

General Description

• Operating Voltage : 3.3V to 5V

• Stereo switchable bridged/single-ended

power amplifiers

• DC Volume Control Interface , 0dB to –105dB

• Low Supply Current , IDD = 13mA at Stereo BTL

• Low Shutdown Current , IDD = 0.7µA

• Bridge-Tied Load (BTL) or Single-Ended-(SE)

Modes Operation

• Output Power at 1% THD+N , VDD=5V

– 2.2W/Ch (typ) into a 3 Ω Load

– 2.0W/Ch (typ) into a 4 Ω Load

– 1.2W/Ch (typ) into a 8 Ω Load

• Output Power at 10% THD+N , VDD=5V

– 2.8W/Ch (typ) into a 3 Ω Load

– 2.3W/Ch (typ) into a 4 Ω Load

– 1.5W/Ch (typ) into a 8Ω Load

• Single-ended mode at 1.0% THD+N

– 95mW/Ch (typ) into 32Ω Load

• Depop Circuitry Integrated

• System Beep Detect

• Thermal shutdown protection circuitry

• High supply voltage ripple rejection

• Low Crossover Distortion

• PC99 Compliant

• 28-pin TSSOP-P (with enhanced thermal pad)

power package available

Applications

• Notebook and Desktop Computers

• Multimedia Monitors

• Portable Applications

The APA4835 is a monolithic integrated circuit , which

provides DC volume control , and a stereo bridged

audio power amplifiers capable of producing 2.8W

(2.2W) into 3Ω with less than 10% (1.0%) THD+N.

APA4835 includes a DC volume control , stereo

bridge-tied and single-ended audio power amplifiers

, stereo docking outputs , and a selectable gain con-

trol , that makes it optimally fittable for notebook PC

, multimedia monitors , and other portable

applications. The attenuator range of the volume

control in APA4835 is from 0dB (DC_Vol=0.7VDD) to

–105dB (DC_Vol=0V) with 32 steps. Both of the

depop circuitry and the thermal shutdown protection

circuitry are integrated in APA4835 , that reduces

pops and clicks noise during power up or shutdown

mode operation , and protects the chip from being

destroyed by over temperature failure. To simplify

the audio system design , APA4835 combines a ste-

reo bridge-tied loads (BTL) mode for speaker drive

and a stereo single-end (SE) mode for headphone

drive into a single chip , where both modes are easily

switched by the SE/BTL input control pin signal. Be-

sides the low supply current design to increase the

efficiency of the amplifiers , APA4835 also features a

shutdown function which keeps the supply current

only 0.7µA (typ).

Pin Description

GND

1

SHUTDOWN

2

Gain Select

3

Mode

4

Mute

5

VDD

6

DC Vol

7

GND

8

Right Dock

9

Right In

10

Beep In

11

Left In

12

Left Dock

13

GND

14

28

Right Out +

27

VDD

26

Right Out -

25

Right Gain 2

24

Right Gain 1

23

GND

22

BYPASS

21

HP Sense

20

GND

19

Left Gain 1

18

Left Gain 2

17

Left Out -

16

VDD

15

Left Out +

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise

customers to obtain the latest version of relevant information to verify before placing orders.

Copyright  ANPEC Electronics Corp.

1

Rev. A.7 - Mar., 2003

www.anpec.com.tw

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