Datasheet > LXT334QE

LXT334QE

更新时间： 2024-11-25 19:49:15

品牌	Logo	应用领域
LevelOne		PC 电信电信集成电路
页数	文件大小	规格书
28页	527K
描述
PCM Transceiver, 4-Func, CEPT PCM-30/E-1, PQFP64,

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LXT334QE 数据手册

DATA SHEET

JULY 1998

Revision 1.0

LXT334

Quad Short-Haul Transceiver with Clock Recovery

General Description

Features

The LXT334 is a quad, short-haul, PCM transceiver for

2.048 MHz or 1.544 MHz transmission systems. Its low

impedance transmit output drivers provide constant line

impedance whether transmitting marks or spaces. The out-

put pulse amplitudes are also constant, stabilized against

supply voltage variations.

• Fully integrated quad, short-haul PCM transceiver for

G.703 2.048 Mbps or 1.544 Mbps operation

• Single rail supply voltage of 5 V (typical)

• Low power consumption of 410 mW (typical)

• Programmable G.703 transmit pulse shaping for

G.703 75 Ω, 100 Ω and 120 Ω systems

• High performance line drivers with constant low

impedance for 20 dB return loss (typical)

exceeds ETSI 300 166

• On-chip band gap voltage reference for stabilized,

constant output amplitude

• High-performance receivers recover data with up to

12 dB cable attenuation

• Low frequency 1.544 or 2.048 MHz reference clock

• On-chip clock recovery function

• Programmable unipolar and bipolar PCM interface

• On-chip AMI and HDB3 encoder/decoder

• On-chip Driver Failure Monitoring circuit

• Local and remote loopback testing function

• Independent Loss of Signal processor for each

channel conforms to ITU G.775 recommendation

The LXT334 can be configured for balanced 100/120 Ω or

unbalanced 75 Ω systems and exceeds the latest ETSI

return loss recommendations. An on-chip pulse shaping

circuit generates accurate transmit pulses independent of

the transmit clock duty cycle. All transmitters and receivers

incorporate a power down mode with output tri-stating.

The LXT334 features differential receiver architecture

with high noise interference margin. It uses peak detection

with a variable threshold for reliable recovery of data as

low as 500 mV (up to 12 dB of cable attenuation).

The fully digital clock recovery system uses a low fre-

quency master clock of 2.048 MHz or 1.544 MHz as its ref-

erence. Each receiver incorporates a combination analog/

digital Loss Of Signal (LOS) processor that meets the latest

ITU G.775 standard. The LXT334 features a driver failure

monitoring circuit in parallel to TTIP and TRING that

reports driver shorts.

• Small-footprint 64-pin QFP

Applications

• High density line cards using digital backend ASICs

LXT334

Block Diagram

Refer to www.level1.com for most current information.

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与LXT334QE相关器件

型号	品牌	获取价格	描述	数据表
LXT334QH	INTEL	获取价格	PCM Transceiver, 4-Func, PQFP64, QFP-64
LXT334QI	INTEL	获取价格	PCM Transceiver, 4-Func, PQFP64, QFP-64
LXT335	LevelOne	获取价格	Quad Short Haul PCM Analog Interface
LXT335QC	LevelOne	获取价格	PCM Transceiver, 4-Func, PQFP64, QFP-64
LXT335QE	INTEL	获取价格	PCM Transceiver, 1-Func, CEPT PCM-30/E-1, Bipolar, PQFP64, QFP-64
LXT335QH	LevelOne	获取价格	暂无描述
LXT335QI	LevelOne	获取价格	暂无描述
LXT336QE	ETC	获取价格	PCM RECEIVER\|QUAD\|CEPT PCM-30/E-1\|CMOS\|QFP\|64PIN\|PLASTIC
LXT350	LevelOne	获取价格	Integrated T1/E1 S/H Transceivers With Crystal-less Jitter Attenuation
LXT350NC	LevelOne	获取价格	PCM Transceiver, 1-Func

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