AV2722

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 minidisk, 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.