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T7507 Datasheet

  • T7507

  • T7507 Quad PCM Codec with Filters, Termination Impedance, an...

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Data Sheet
August 1999
T7507 Quad PCM Codec with Filters,
Termination Impedance, and Hybrid Balance
Features
s
s
Description
The T7507 device is a single-chip, four-channel
A-law PCM codec with filters. This integrated circuit
provides analog-to-digital and digital-to-analog con-
version. It provides the transmit and receive filtering
necessary to interface a voice telephone circuit to a
time-division multiplexed system. This device is pack-
aged in a 44-pin PLCC.
This codec is intended for use with Lucent Technolo-
gies Microelectronics Group鈥檚 L8567 SLIC. When
used with that SLIC, the line tip/ring pair is termi-
nated in the network required for central office appli-
cations in the People鈥檚 Republic of China (PRC).
Proper hybrid balance and transmit and receive
gains are also obtained.
This device uses a serial data control scheme to
interface with the controlling processor. This device
has a latched parallel data control scheme to provide
control bits to, and receive status bits from, the SLIC
and switch. This interface is designed to be compati-
ble with the Lucent L8567 SLIC and L7583 solid-
state switch.
5 V only
Low-power, latch-up-free CMOS technology:
鈥?37 mW/channel typical operating power
dissipation
鈥?1 mW/channel typical powerdown dissipation
Fixed master clock frequency: 2.048 MHz
On-chip sample and hold, autozero, and precision
voltage reference
Differential architecture for high noise immunity
and power supply rejection
PCM interface:
鈥?Fixed 2.048 MHz data rate
鈥?Delayed and nondelayed PCM modes
鈥?Fully flexible time-slot assignment
鈥?Transmit and receive aligned or offset
Transmit PCM data output enable
Serial control interface with controlling processor
Latched parallel control interface with SLIC and
switch
Meets or exceeds D3/D4 (as per Lucent PUB
43801) and ITU-T G.711鈥擥.714 requirements
Operating temperature range: 鈥?0 擄C to +85 擄C
A-law companding
Hybrid balance and termination impedance:
鈥?200
鈩?/div>
in series with 680
鈩?/div>
|| 0.1 碌F
(People鈥檚 Republic of China Z
T
)
鈥?Matched with L8567 SLIC
Programmable receive gain (鈥?.5 dB or 鈥? dB),
fixed transmit gain (0 dB) when matched with
L8567 SLIC
44-pin PLCC
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