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Am79Q021

Legerity
Part Number Am79Q021
Manufacturer Legerity
Description Quad Subscriber Line Audio-Processing
Published Sep 29, 2015
Detailed Description Am79Q02/021/031 Quad Subscriber Line Audio-Processing Circuit (QSLAC™) Devices DISTINCTIVE CHARACTERISTICS  Performs t...
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Am79Q021
Am79Q021

Overview
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) impedance scaling  Performance characteristics guaranteed over a 12 dB gain range  Real Time Data register with interrupt (open drain or TTL output)  Supports multiplexed SLIC inputs  Broadcast state  256 kHz or 293 kHz chopper clock for Legerity SLICs with switching regulator  Maximum channel bandwidth for V.
34 modems Advanced submicron CMOS technology makes the Am79Q02/021/031 QSLAC devices economical, with both the functionality and the low power consumption needed in linecard designs to maxi...


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