E-ETC5054D-X/HTR View Datasheet(PDF) - STMicroelectronics
Part Name
Description
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E-ETC5054D-X/HTR Datasheet PDF : 18 Pages
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ETC5054
®
ETC5057
SERIAL INTERFACE CODEC/FILTER
COMPLETE CODEC AND FILTERING SYS-
TEM (DEVICE) INCLUDING:
– Transmit high-pass and low-pass filtering.
– Receive low-pass filter with sin x/x correction.
– Active RC noise filters
– µ-law or A-law compatible COder and DECoder.
– Internal precision voltage reference.
– Serial I/O interface.
– Internal auto-zero circuitry.
A-LAW 16 PINS (ETC5057FN, 20 PINS)
µ-LAW WITHOUT SIGNALING, 16 PINS
(ETC5054FN, 20 PINS)
MEETS OR EXCEEDS ALL D3/D4 AND
CCITT SPECIFICATIONS
±5V OPERATION
LOW OPERATING POWER - TYPICALLY 60
mW
POWER-DOWN STANDBY MODE - TYPI-
CALLY 3 mW
AUTOMATIC POWER-DOWN
TTL OR CMOS COMPATIBLE DIGITAL IN-
TERFACES
MAXIMIZES LINE INTERFACE CARD CIR-
CUIT DENSITY
0 to 70°C OPERATION
DIP16 (Plastic)
ORDERING NUMBERS:
ETC5057N
ETC5054N
SO16 (Wide)
ORDERING NUMBERS:
ETC5057D
ETC5054D
DESCRIPTION
The ETC5057/ETC5054 family consists of A-law
and µ–law monolithic PCM CODEC/filters utilizing
the A/D and D/A conversion architecture shown in
the block diagram below, and a serial PCM inter-
face. The devices are fabricated using double-
poly CMOS process. The encode portion of each
device consists of an input gain adjust amplifier,
an active RC pre-filter which eliminates very high
frequency noise prior to entering a switched-ca-
pacitor band-pass filter that rejects signals below
200 Hz and above 3400 Hz. Also included are
auto-zero circuitry and a companding coder which
samples the filtered signal and encodes it in the
companded A-law or µ–law PCM format. The de-
code portion of each device consists of an ex-
panding decoder, which reconstructs the analog
signal from the companded A-law or µ–law code,
a low-pass filter which corrects for the sin x/x re-
sponse of the decoder output and rejects signals
above 3400 Hz and is followed by a single-ended
power amplifier capable of driving low impedance
loads. The devices require 1.536 MHz, 1.544
PLCC20
ORDERING NUMBERS:
ETC5057FN
ETC5054FN
MHz, or 2.048 MHz transmit and receive master
clocks, which may be asynchronous, transmit and
receive bit clocks which may vary from 64 kHz to
2.048 MHz, and transmit and receive frame sync
pulses. The timing of the frame sync pulses and
PCM data is compatible with both industry stand-
ard formats.
March 2000
1/18
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
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