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參數資料
| 型號： | T7570 |
| 元件分類： | Codec |
| 英文描述： | T7570 Programmable PCM Codec with Hybrid-Balance Filter |
| 中文描述： | T7570可編程PCM編解碼器與混合平衡濾波器 |
| 文件頁數： | 1/28頁 |
| 文件大小： | 567K |
| 代理商： | T7570 |
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Data Sheet
October 1996
T7570 Programmable PCM Codec
with Hybrid-Balance Filter
Features
I
Programmable internal hybrid-balance network
I
Programmable transmit gain
— 19.4 dB range, 0.1 dB step size
I
Programmable receive gain
— 19.4 dB range, 0.1 dB step size
I
Dual-programmable PCM interface
— Up to 64 time slots per frame
— Variable data rate (64 kHz to 4.096 MHz)
— Two timing modes
I
Programmable
μ
-law or A-law companding
I
300
drive receive amplifier
I
Analog and digital loopbacks
I
On-chip sample-and-hold, autozero, and precision
voltage reference
I
Single 5 V power supply
I
Latch-up free, low-power CMOS technology
— 70 mW typical operating power dissipation
— 1.5 mW typical standby power dissipation
I
Serial microprocessor-control interface
I
6-pin parallel I/O latch
I
TTL- and CMOS-compatible digital I/O
I
Meets or exceeds D3/D4 (as per Lucent PUB
43801), ITU-T (formerly CCITT) G.711—G.714,
and LSSGR requirements
I
Operating temperature range: –40
°
C to +85
°
C
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 filter. It provides ana-
log-to-digital and digital-to-analog conversion, as well
as the transmit and receive filtering 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 filter 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.
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