Publication# 20031
Rev: D Amendment: /0
Issue Date: January 2000
Although the name and logo have changed, the data contained herein
remains the same as the most recent AMD revision of this document.
DISTINCTIVE CHARACTERISTICS
n Performs the function of four Codec/Filters
n A-law or µ-law coding
n Single PCM port
— Up to 4.096 MHz operation (64 channels)
n Hardware programmable (via external
components)
— Transhybrid balance impedance
— Transmit and receive gains
n Additional Am79Q4457 device capabilities
(per channel, set external)
— Three selectable transmit gains
— Three selectable receive gains
— Two selectable balance networks
— Simple serial control interface
n Separate PCM and Master clocks
n 1.536 MHz, 1.544 MHz, 2.048 MHz, or 4.096 MHz
master clock options
— Internal timing automatically adjusted based on
MCLK and frame sync signal
n Low power 5.0 V CMOS technology
n 5.0 V only operation
GENERAL DESCRIPTION
The Am79Q4457/5457 Quad Subscriber Line Audio
Processing Circuit-Non-Programmable (QSLAC-NP)
device integrates the key functions of analog linecards
into a high-performance, four-channel Codec/Filter
device. The QSLAC-NP devices are based on the
proven design of the reliable Am79C02/03/031(A)
Dual Sub scr ibe r Li ne Aud io-Processing Ci rcu it
(DSLAC™) devices, and the Am79C202 Advanced
Subscriber Line Audio-Processing Circuit (ASLAC™)
device. The advanced architecture of the QSLAC-NP
devices implements four independent channels in a
single integrated circuit, providing a cost-effective
solution for the audio-processing function of Plain Old
Telephone Service (POTS) linecards.
The Am79Q4457/5457 QSLAC-NP device provides
four industry-standard Codec/Filter devices in a single
integrated circuit. The Am 79Q4457/5457 device
provides a transmit and receive frame synchronization
input per channel. A-law or µ-law compression is
selected via a device pin.
In addition, the Am79Q4457 device provides the ability
to select one of three independent gain settings (both
transmit and receive) and one of two balance networks
on a per-channel basis. The transmit and receive gain
leve ls ar e set once fo r th e devi ce via exte r na l
components. Gain level selection and the balance
network selection is achieved through an integrated
serial shift register and latch per channel.
The Am 79Q5457 device provides four industr y-
standard Codec/Filter devices in a 32-pin PLCC or 44-
pin TQFP package. The Am79Q4457 device provides
four industr y-standard Codec/Filter devices and
selectable gain and balance functions in a 44-pin PLCC
or 44-pin TQFP package.
Advanced submicron CMOS technology enables the
Am79Q4457/5457 QSLAC-NP device to have both
the functionality and the low power consumption
required in linecard designs, maximizing linecard
density at a minimum cost. When used with four
Legerity SLICs, a QSLAC-NP device provides a
complete solution to the BORSCHT function of a
POTS linecard.
Am79Q4457/5457
Quad Subscriber Line Audio Processing Circuit-
Non-Programmable (QSLAC™-NP) Devices
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