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APA4838R

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

Anpec Electronics 

APA4838

Stereo 2.8W Audio Power Amplifier with DC Volume Control

and Selectable Gain

Features

General Description

• Operating Voltage : 4.5V to 5V

The APA4838 is a monolithic integrated circuit , which

• Stereo switchable bridged/single-ended

provides DC volume control , and a stereo bridged

audio power amplifiers capable of producing 2.8W

power amplifiers

(2.3W) into 3Ω with less than 10% (1.0%) THD+N.

• DC Volume Control Interface , 0dB to –78dB

with precision scale

APA4838 includes a DC volume control , stereo

bridge-tied and single-ended audio power amplifiers

, stereo docking outputs , and a selectable gain con-

• Supply Current , IDD = 15mA at Stereo BTL

• Low Shutdown Current , IDD = 0.7µA

trol , that makes it optimally fittable for notebook PC

, multimedia monitors , and other portable

applications. The attenuator range of the volume

• Bridge-Tied Load (BTL) or Single-Ended-(SE) control in APA4838 is from 0dB (DC_Vol=0.8VDD) to

Modes Operation

•

Output Power at 1% THD+N , V =5V

DD

–78dB (DC_Vol=0V) with 31 steps. Both of the depop

circuitry and the thermal shutdown protection circuitry

are integrated in APA4838 , that reduces pops and

– 2.3W/Ch (typ) into a 3 Ω Load

clicks noise during power up or shutdown mode op-

– 2.0W/Ch (typ) into a 4 Ω Load

eration , and protects the chip from being destroyed

by over temperature failure. To simplify the audio

– 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

system design , APA4838 combines a stereo 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

– 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

by the HP Sense input control pin signal. Besides

the low supply current design to increase the effi-

ciency of the amplifiers , APA4838 also features a

shutdown function which keeps the supply current

only 0.7µA (typ).

• Depop Circuitry Integrated

• Thermal shutdown protection and over current Pin Description

protection circuitry

• High supply voltage ripple rejection

• PC99 Compliant

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

power package available

Applications

• Notebook and Desktop Computers

• Multimedia Monitors

• Portable Applications

GND

1

Shutdown

2

Gain Select

3

Mode

4

Mute

5

V

6

DD

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

V

DD

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.1 - Apr., 2003

www.anpec.com.tw

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