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AV2722 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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AV2722 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 29 page  1-29 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 • 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. 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 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 AINR ADC VCM MICBIAS HPVR HPDET SC SDO 2 OR 3 WIRE SERIAL COMMAND PORT SDA SCL CSB MODE VDDA VSS VSSH VSSA VSSA RS/ CLOCK GENERATOR INTERPOLATION DIGITAL FILTER LOW PASS FILTER LOW PASS FILTER HEADPHONE DRIVER HEADPHONE DRIVER VOLUME CONTROL GAIN CONTROL GAIN CONTROL |
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