The T7507 device is a single-chip, four-channel A-law PCM codec with filters. This integrated circuit provides analog-to-digital and digital-to-analog conversion. It provides the transmit and receive filtering necessary to interface a voice telephone circuit to a time-division multiplexed system. This device is packaged in a 44-pin PLCC. This codec is intended for use with Lucent Technologies Microelectronics Group's L8567 SLIC. When used with that SLIC, the line tip/ring pair is terminated in the network required for central office applications in the People's Republic of China (PRC). Proper hybrid balance and transmit and receive gains are also obtained.