1/16

www.rohm.com

2010.09 - Rev.A

© 2010 ROHM Co., Ltd. All rights reserved.

Audio Accessory ICs for Mobile Devices

Voice/Audio

Mixer & Selector IC

BU7831KN

●

Description

BU7831KN is the sound path selector which include 3 stereo inputs, Stereo headphone amp, 600Ω driver amp, and

2stereooutputs. Each output have a mixer and an attenuator, you can set the variable audio path setting. The variable audio

source can connect to Headphone and speaker through this LSI.

●

Feature

1) It has 3stereo inputs.

2) It has analog mixer on each input.

3) It matches for the application used the Headphone because it has 16Ω audio driver.

4) 16Ω driver has the pop-noise less function.

5) The attenuator of 16Ω driver has soft changing and muting function.

6) It has 600Ω driver for external output.

7) It included stereo output for stereo speaker.

8) VQFN20 small package

●

Applications

It is for portable equipments with audio player.

●

Absolute maximum ratings

Parameter

Symbol

Ratings

Unit

Supply voltage

VDD

-0.3～4.5

V

Power dissipation

Pd

530

*1

mW

Operating temperature range

Topr

-30～+85

℃

Storage temperature range

Tstg

-55～+125

℃

*1 Reduce by 5.3 mW/ ℃ over 25 ℃

●

Recommended operating range

Parameter

Symbol

Ratings

Unit

Min.

Typ.

Max.

Supply voltage

VDD

2.5

3.0

3.3

V

No.10087EAT02