W9321

The Winbond ADPCM Codec W9321 is a single channel chip incorporating a SD PCM codec filter with a 32K, 24K, 16K ADPCM encoder/decoder complying with the CCITT G.721 and G.726 standards. In addition, this chip also meets the PCM conformance specification of the CCITT G.714 recommendation.

W9321 allows full-duplex operation over a wide voltage range from 2.7 to 5.25 volts; it's low power consumption makes it ideal for battery or AC powered applications. The chip includes a serial setup port (SSP) interface with a 16 byte setup and status registers. A microcontroller can access many built-in features through the SSP interface. In addition, W9321 also consists of some OP amplifiers integrated with a SD PCM codec-filter to allow for easy control of the analog interface. W9321 can be used on two key applications. One application is for wireless telephone systems such as CT2, DECT. Another application is for public switch telephone network (PSTN) applications such as pair gain. See the section on application information for more details.