Am79Q02

Am79Q02/021/031 Quad Subscriber Line Audio-Processing Circuit (QSLAC™) Devices DISTINCTIVE CHARACTERISTICS
Performs the functions of four codec/filters
Software programmable: — SLIC input impedance — Transhybrid balance — Transmit and receive gains — Equalization (frequency response) — Digital I/O pins — Programmable debouncing on one input — Time slot assigner — Programmable clock slot and PCM transmit clock edge options
Standard microprocessor interface
A-law, µ-law, or linear coding
Single or Dual PCM ports available — Up to 128 channels (PCLK at 8.192 MHz) per PCM port — Optional supervision on the PCM highway GENERAL DESCRIPTION The Am79Q02/021/031 Quad Subscriber Line AudioProcessing Circuit (QSLAC) devices integrate the key functions of analog linecards into high-performance, very-programmable, four-channel codec-filter devices. The QSLAC devices are based on the proven design of Legerity’s reliable SLAC™ device families. The advanced architecture of the QSLAC devices implements four independent channels and employs digital filters to allow software control of transmission, thus providing a cost-effective solution for the audioprocessing function of programmable linecards.
1.536, 1.544, 2.048, 3.072, 3.088, 4.096, 6.144, 6.176, or 8.192 MHz master clock derived from MCLK or PCLK
Built-in test modes with loopback, tone generation, and µP access to PCM data
Low-power, 5.0 V CMOS technology
5.0 V only operation
Mixed state (analog and digital) impeda...