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T7570 Datasheet

  • T7570

  • T7570 Programmable PCM Codec with Hybrid-Balance Filter

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Data Sheet
October 1996
T7570 Programmable PCM Codec
with Hybrid-Balance Filter
Features
s
s
Description
The Lucent Technologies Microelectronics Group
T7570 Programmable PCM Codec with Hybrid-Bal-
ance Filter is a programmable PCM codec with an
internal hybrid-balance network 鏗乴ter. It provides ana-
log-to-digital and digital-to-analog conversion, as well
as the transmit and receive 鏗乴tering necessary to
interface a voice telephone circuit to a time-division
multiplexed (TDM) system. Programmable features
include transmit gain setting over a 19.4 dB range
and receive gain setting over a 19.4 dB range. An
internal 鏗乴ter can be programmed to provide hybrid
balancing over a wide range of loop impedances for
both active and transformer subscriber line interface
circuits (SLIC).
The device is programmed over a low pin-count,
standard, serial, microprocessor-control interface. A
6-pin parallel input/output latch is provided to control
interface circuits. Each of these pins can be individu-
ally programmed to be an input or an output.
The T7570 is fabricated by using a low-power CMOS
technology, requires a single 5 V supply, and is avail-
able in a 28-pin PLCC package for surface mounting.
Programmable internal hybrid-balance network
Programmable transmit gain
鈥?19.4 dB range, 0.1 dB step size
Programmable receive gain
鈥?19.4 dB range, 0.1 dB step size
Dual-programmable PCM interface
鈥?Up to 64 time slots per frame
鈥?Variable data rate (64 kHz to 4.096 MHz)
鈥?Two timing modes
Programmable
碌-law
or A-law companding
300
鈩?/div>
drive receive ampli鏗乪r
Analog and digital loopbacks
On-chip sample-and-hold, autozero, and precision
voltage reference
Single 5 V power supply
Latch-up free, low-power CMOS technology
鈥?70 mW typical operating power dissipation
鈥?1.5 mW typical standby power dissipation
Serial microprocessor-control interface
6-pin parallel I/O latch
TTL- and CMOS-compatible digital I/O
Meets or exceeds D3/D4 (as per Lucent PUB
43801), ITU-T (formerly CCITT) G.711鈥擥.714,
and LSSGR requirements
Operating temperature range: 鈥?0
擄C
to +85
擄C
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    T7570 Programmable PCM Codec with Hybrid-Balance Filter
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