Quad Subscriber Line Audio-Processing
Am79Q02/021/031
Quad Subscriber Line Audio-Processing Circuit (QSLAC™) Devices
DISTINCTIVE CHARACTERISTICS
Performs t...
Description
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...
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