GENERAL DESCRIPTION

The Am79C02/03/031(A) Dual Subscriber Line Audio Processing Circuit (DSLAC device) integrates the key functions of an analog linecard into a single high-performance, programmable dual codec/filter device. The DSLAC device is based on the proven design of the reliable Am7901A Subscriber Line Audio Processing Circuit (SLAC™ device). The advanced architecture of the DSLAC device implements two independent channels and employs digital filters to allow software control

of transmission, thus providing a cost effective solution for the analog to PCM function of a linecard.

■Software programmable:

— SLIC impedance

— Transhybrid balance

— Transmit and receive gains

— Equalization

— Digital I/O pins

— Time Slot Assigner

— PCM transmit clock edge options

■Adaptive transhybrid balance filter(A suffix only)

■A-law or µ-law coding

■Dual PCM ports

  —Up to 8.192 MHz each (128 channels per port)

■2.048 MHz or 4.096 MHz master clock

■Direct transformer drive

■Built-in test modes

■Low power CMOS

■Mixed mode(analog and digital) impedance scaling

■Performance characteristics guaranteed over 12 dB gain range