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AVS

Technology

FEATURES

鈥?Complete DAC and ADC Audio CODEC with headphone

driver.

鈥?Up to 96kHz input sampling frequencies for ADC/DAC

鈥?Selectable DAC De-emphasis Filter.

鈥?Selectable ADC High Pass Filter

鈥?Programmable Audio Data Interface

鈥?I

2

S, Normal, Left justified or DSP data for ADC/DAC

鈥?16,18, 20 and 24-bit input data resolution

鈥?System clock: 64fs, 96fs,128fs, 192fs, 256fs or 384fs

鈥?250fs and 272fs system clock for USB application

鈥?Master or Slave Clocking mode

鈥?Regular audio or USB mode audio

鈥?2 or 3-wire software control interface selectable by external

pin.

鈥?2 channel microphone or line inputs

鈥?Programmable power down features to conserve power

AV2722

AUDIO CODEC WITH HEADPHONE DRIVER

AND PROGRAMMABLE SAMPLE RATES

DESCRIPTION

The AV2722 is a mixed signal CMOS monolithic device which

is a low cost audio CODEC designed with a built-in

headphone driver. It supports regular audio or USB mode

audio and is therefore ideal for portable MP3 audio and

speech players and recorders. It can also be used for mini-

disk, CD-RW machines.

Stereo line audio inputs with programmable gain are provided

A microphone bias voltage output is also provided which

makes the AV2722 ideal for an electret type microphone.

For the multi-bit signal delta DAC, 64X oversampling digital

interpolation filter is used with programmable de-emphasis,

volume control, and sampling rate selection features. The

DAC supports I2S, Normal, Left justified or DSP data with 16,

18, 20 and 24-bit resolution. Sampling rates from 8KHz to 192

KHz are supported. At the DAC output, stereo headphone

drivers are built in for driving headphones.

For the multi-bit delta-sigma ADC, programmable gain

are provided at the input. state of the art decimation filter is

used to down-sample the received signal and finally a

selectable high pass filter is used to reduce un-wanted low

frequency noise. The digital audio serial output can be

programmed at various formats similar to the DAC input.

GENERAL

鈥?2.7-volt to 3.6-volt Power Supply range (TBD)

鈥?28-pin SSOP package

APPLICATIONS

鈥?Low cost, CD-quality consumer audio equipment

鈥?Portable MP3 Players and Recorders

ADVANCE PRODUCT INFORMATION.

AVS RESERVES THE RIGHT TO MODIFY THIS PRODUCT

WITHOUT NOTICE.

XCK

VDD

VDDH

VDDA

D

R

A

FT

LOW

PASS

FILTER

LOW

PASS

FILTER

HEADPHONE

DRIVER

HEADPHONE

DRIVER

GAIN

CONTROL

GAIN

CONTROL

CLOCK GENERATOR

HPDET

AOUTL

HOUTL

AOUTR

HOUTR

VCM

HPVR

AINL

AINR

MICBIAS

AUDIO

DIGITAL AUDIO I/O INTERFACE

SDI

SFDA

SERIAL

INPUT

PORT

INTERPOLATION

DIGITAL

FILTER

MULTI-LEVEL

DELTA-SIGMA

MODULATOR

DAC

DAC

SC

SFAD

VOLUME CONTROL

AUDIO

SERIAL

OUTPUT

PORT

HIGH

PASS

FILTER

DECIMATION

DIGITAL

FILTER

MULTI-LEVEL

DELTA-SIGMA

MODULATOR

ADC

ADC

SDO

2 OR 3 WIRE SERIAL COMMAND PORT

SDA SCL

CSB

MODE

RS/

VSS

VSSH

VSSA

VSSA

AV2722 BLOCK DIAGRAM

AVS Technology Inc.

4110 Clipper Ct., Fremont CA94538

Tel: (510) 353-0848

Fax: (510) 353-0856

1-29

January 22, 2004

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