Am79Q021 Datasheet | Legerity

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 Audio Processing 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 d B gain range Real Time Data register with interrupt (open drain or TTL output) Supports multiplexed SLIC inputs Broadcast state 256 k Hz or 293 k Hz 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...