(China (Mainland))
Product Summary
The AM79Q021JC Quad Subscriber Line Audio-Processing Circuit (QSLAC) device integrates the key functions of analog linecards into high-performance, very-programmable, four-channel codec-filter devices. The AM79Q021JC is based on the proven design of Legerity reliable SLAC. device families. The advanced architecture of the AM79Q021JC 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.
Parametrics
AM79Q021JC absolute maximum ratings: (1)Storage Temperature, Plastic Packages: –65℃ to +125℃; (2)Ambient Temperature with Power Applied: –40℃ to +85℃; (3)Voltage with Respect to Ground, VCC: –4.0 V to +7.0 V; (4)VCCD with respect to DGND: –0.4 V to +7.0 V; (5)AGND with respect to DGND: ±0.4 V; (6)Source from VCCD: 40 mA.
Features
AM79Q021JC features: (1)Standard microprocessor interface; (2)A-law, μ-law, or linear coding; (3)Single or Dual PCM ports available; (4)Built-in test modes with loopback, tone generation, and μP access to PCM data; (5)Low-power, 5.0 V CMOS technology; (6)5.0 V only operation; (7)Mixed state (analog and digital) impedance scaling; (8)Performance characteristics guaranteed over a 12 dB gain range; (9)Real Time Data register with interrupt (open drain or TTL output); (10)Supports multiplexed SLIC inputs; (11)Broadcast state; (12)256 kHz or 293 kHz chopper clock for Legerity SLICs with switching regulator; (13)Maximum channel bandwidth for V.34 modems.
Diagrams
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