EVAL-AD73322EB

The AD73322 is a dual front-end processor for general purpose applications including speech and telephony. It features two 16-bit A/D conversion channel and two 16-bit D/A conversion channel. Each channel provides 70 dB signalto-noise ratio over a voiceband signal bandwidth.

The AD73322 is suitable for a variety of applications in the speech and telephony area including low bit rate, high quality compression, speech enhancement, recognition and synthesis. The low group delay characteristic of the part makes it suitable for single or multichannel active control applications.

The gains of the A/D and D/A conversion channels are programmable over 38dB and 21dB ranges respectively. An on-chip reference voltage is included to allow single supply operation. A serial port (SPORT) allows easy interfacing of single or cascaded devices to industry standard DSP engines. The AD73322 is available in both 28-lead SOIC and 44-lead LQFP packages.

Full data on the AD73322 is available in the AD73322 data sheet available from Analog Devices and should be consulted in conjunction with this Technical Note when using the Evaluation Board.

Included on the evaluation board, along with the two AD73322 Codecs are a power supply circuit, a clock generator circuit, a cascade selector circuit and a daughter board. These are explained in detail on the next page.