AM79Q02 Datasheet, PDF (1/68 Pages) List of Unclassifed Manufacturers – Quad Subscriber Line Audio-Processing Circuit (QSLAC) Devices

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 audio-
processing 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 maximize linecard
density at minimum cost. When used with four Legerity
SLICs, a QSLAC device provides a complete software-
configurable solution to the BORSCHT functions.
Publication# 080147 Rev: H Amendment: /0
Issue Date: September 2001