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AVS Technology Inc.
4110 Clipper Ct., Fremont CA94538
Tel: (510) 353-0848
Fax: (510) 353-0856
January 22, 2004
FEATURES
• Complete DAC and ADC Audio CODEC with headphone
driver.
• Up to 96kHz input sampling frequencies for ADC/DAC
• Selectable DAC De-emphasis Filter.
• Selectable ADC High Pass Filter
• Programmable Audio Data Interface
• I
2
S, Normal, Left justified or DSP data for ADC/DAC
• 16,18, 20 and 24-bit input data resolution
• System clock: 64fs, 96fs,128fs, 192fs, 256fs or 384fs
• 250fs and 272fs system clock for USB application
• Master or Slave Clocking mode
• Regular audio or USB mode audio
• 2 or 3-wire software control interface selectable by external
pin.
• 2 channel microphone or line inputs
• Programmable power down features to conserve power
GENERAL
• 2.7-volt to 3.6-volt Power Supply range (TBD)
• 28-pin SSOP package
APPLICATIONS
• Low cost, CD-quality consumer audio equipment
• Portable MP3 Players and Recorders
ADVANCE PRODUCT INFORMATION.
AVS RESERVES THE RIGHT TO MODIFY THIS PRODUCT
WITHOUT NOTICE.
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.

AVS Technology
AUDIO CODEC WITH HEADPHONE DRIVER
AND PROGRAMMABLE SAMPLE RATES
AV2722
D
R
AFT
AUDIO
SERIAL
PORT
MULTI-LEVEL
DELTA-SIGMA
MODULATOR
DAC
SDI
SFDA
SFAD
XCK VDD VDDH
AOUTL
AV2722 BLOCK DIAGRAM

AUDIO
SERIAL
PORT
DECIMATION
DIGITAL
FILTER
MULTI-LEVEL
DELTA-SIGMA
MODULATOR
ADC
INPUT
OUTPUT
HIGH
PASS
FILTER
HOUTL
DAC
AOUTR

HOUTR
AINL
AINRADC
VCM
MICBIAS
HPVR
HPDET
D
I
G
I
T
A
L

A
U
D
I
O

I
/
O

I
N
T
E
R
F
A
C
E
SC
SDO
2 OR 3 WIRE SERIAL COMMAND PORT
SDA SCL CSB MODE
VDDA
VSS VSSH
VSSA VSSARS/
CLOCK GENERATOR
INTERPOLATION
DIGITAL
FILTER
LOW
PASS
FILTER
LOW
PASS
FILTER
HEADPHONE
DRIVER
HEADPHONE
DRIVER

VOLUME CONTROL
GAIN
CONTROL
GAIN
CONTROL