AV2722 Datasheet, PDF (1/29 Pages) List of Unclassifed Manufacturers – AUDIO CODEC WITH HEADPHONE DRIVER AND PROGRAMMABLE SAMPLE RATES

AVS Technology
AV2722
AUDIO CODEC WITH HEADPHONE DRIVER
AND PROGRAMMABLE SAMPLE RATES
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
• I²S, 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.
FT _{For the multi-bit delta-sigma ADC, programmable gain}
are provided at the input. state of the art decimation filter is
A _{used to down-sample the received signal and finally a}
R ^{selectable high pass filter is used to reduce un-wanted low}
frequency noise. The digital audio serial output can be
D _{programmed at various formats similar to the DAC input.}
SDI
SFDA
SC
SFAD
SDO
AUDIO
SERIAL
INPUT
PORT
XCK VDD VDDH VDDA
CLOCK GENERATOR
INTERPOLATION
DIGITAL
FILTER
MULTI-LEVEL
DELTA-SIGMA
MODULATOR
AUDIO
SERIAL
OUTPUT
PORT
HIGH
PASS
FILTER
DECIMATION
DIGITAL
FILTER
2 OR 3 WIRE SERIAL COMMAND PORT
MULTI-LEVEL
DELTA-SIGMA
MODULATOR
DAC
LOW
PASS
FILTER
HEADPHONE
DRIVER
DAC
LOW
PASS
FILTER
HEADPHONE
DRIVER
VOLUME CONTROL
ADC
GAIN
CONTROL
ADC
GAIN
CONTROL
SDA SCL CSB MODE
RS/
VSS VSSH ^{VSSA VSSA}
AV2722 BLOCK DIAGRAM
HPDET
AOUTL
HOUTL
AOUTR
HOUTR
VCM
HPVR
AINL
AINR
MICBIAS
AVS Technology Inc.
4110 Clipper Ct., Fremont CA94538
Tel: [phone]
Fax: [phone]
1-29
January 22, 2004