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DESCRIPTION

APPLICATIONS

APPLICATION CIRCUIT

PGND

ROUT-

RHPIN

RLINEIN

RIN

LIN

LLINEIN

LHPIN

LOUT-

1

ROUT+

SE/BTL

HP/LINE

VOLUME

SEDIFF

SEMAX

AGND

BYPASS

FADE

SHUTDOWN

LOUT+

PGND

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

Right HP

Audio Source

Power Supply

Right Line

Audio Source

Left Line

Audio Source

Left HP

Audio Source

Power Supply

100 k

Ω

100 k

Ω

In From DAC

or

Potentiometer

(DC Voltage)

System

Control

Right

Speaker

Left

Speaker

Headphone

s

1 k

Ω

1 k

Ω

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

20

30

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

Volume [Pin 21] - V

DC VOLUME CONTROL

SE Volume,

SEDIFF [Pin 20] = 0 V

SE Volume,

SEDIFF [Pin 20] = 1 V

BTL Volume

BTL Volume (dB)

∝ Volume (V)

SE Volume (dB)

∝ Volume (V) - SEDIFF

(V)

TPA6011A4

SLOS392A – FEBRUARY 2002 – REVISED JULY 2004

3-W STEREO AUDIO POWER AMPLIFIER

WITH ADVANCED DC VOLUME CONTROL

•

Advanced DC Volume Control With 2-dB

The TPA6011A4 is a stereo audio power amplifier

Steps

that drives 3 W/channel of continuous RMS power

From -40 dB to 20 dB

into a 3-

Ω load. Advanced dc volume control

minimizes external components and allows BTL

– Fade Mode

(speaker) volume control and SE (headphone) vol-

– Maximum Volume Setting for SE Mode

ume control. Notebook and pocket PCs benefit from

– Adjustable SE Volume Control

the integrated feature set that minimizes external

Referenced to BTL Volume Control

components without sacrificing functionality.

•

3 W Into 3-

Ω Speakers

To simplify design, the speaker volume level is

adjusted by applying a dc voltage to the VOLUME

•

Stereo Input MUX

terminal. Likewise, the delta between speaker volume

•

Differential Inputs

and headphone volume can be adjusted by applying

a dc voltage to the SEDIFF terminal. To avoid an

unexpected

high

volume

level

through

the

•

Notebook PC

headphones, a third terminal, SEMAX, limits the

•

LCD Monitors

headphone volume level when a dc voltage is ap-

plied. Finally, to ensure a smooth transition between

•

Pocket PC

active and shutdown modes, a fade mode ramps the

volume up and down.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2002–2004, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.