The T7504 and T5504 devices are single-chip, fourchannel -law/A-law PCM codecs with filters. These integrated circuits provide analog-to-digital and digital-to-analog conversion. They provide the transmit and receive filtering necessary to interface a voice telephone circuit to a time-division multiplexed system. These devices are available in 28-pin PLCCs. The T7504 is also available in a 44-pin MQFP.