T7570

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of this data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability.

The Lucent Technologies Microelectronics Group T7570 Programmable PCM Codec with Hybrid-Balance Filter is a programmable PCM codec with an internal hybrid-balance network filter. It provides analog- to-digital and digital-to-analog conversion, as well as the transmit and receive filtering necessary to interface a voice telephone circuit to a time-division multiplexed (TDM) system. Programmable features include transmit gain setting over a 19.4 dB range and receive gain setting over a 19.4 dB range. An internal filter can be programmed to provide hybrid balancing over a wide range of loop impedances for both active and transformer subscriber line interface circuits (SLIC).

The device is programmed over a low pin-count, standard, serial, microprocessor-control interface. A 6-pin parallel input/output latch is provided to control interface circuits. Each of these pins can be individually programmed to be an input or an output. The T7570 is fabricated by using a low-power CMOS technology, requires a single 5 V supply, and is available in a 28-pin PLCC package for surface mounting.