XRT7295ATIWF Exar Corporation, XRT7295ATIWF Datasheet

XRT7295ATIWF

Manufacturer Part Number

XRT7295ATIWF

Description

SOJ-20

Manufacturer

Exar Corporation

Datasheet

1.XRT7295ATIWF.pdf (18 pages)

Specifications of XRT7295ATIWF

Date_code

06+

Current page: 1 of 18
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FEATURES

D Fully Integrated Receive Interface for DS3 and

D Integrated Equalization (Optional) and Timing

D Loss-of-Signal and Loss-of-Lock Alarms

D Variable Input Sensitivity Control

D 5V Power Supply

D Pin Compatible with XRT7295AE and XRT7295AC

D Companion Device to T7296 Transmitter

GENERAL DESCRIPTION

The XRT7295AT DS3/SONET STS-1 integrated line

receiver is a fully integrated receive interface that

terminates a bipolar DS3 (44.736Mbps) or Sonet STS-1

(51.84Mbps) signal transmitted over coaxial cable. (See

Figure 13).

The device also provides the functions of receive

equalization (optional), automatic-gain control (AGC),

clock-recovery and data retiming, loss-of-signal and

loss-of-frequency-lock detection.

interface is dual-rail, with received positive and negative

1s appearing as unipolar digital signals on separate

output leads. The on-chip equalizer is designed for cable

distances of 0 to 450ft. from the cross-connect frame to

the device.

sensitivity control, providing three different sensitivity

ORDERING INFORMATION

STS-1 Rate Signals

Recovery

Rev. 1.20

E2000

EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017

The receive input has a variable input

XRT7295ATIW

Part No.

The digital system

20 Lead 300 Mil JEDEC SOJ

Package

APPLICATIONS

D Interface to DS-3 Networks

D Digital Cross-Connect Systems

D CSU/DSU Equipment

D PCM Test Equipment

D Fiber Optic Terminals

settings, to adapt longer cables. High input sensitivity

allows for significant amounts of flat loss within the

system. Figure 1 shows the block diagram of the device.

The XRT7295AT device is manufactured using linear

CMOS technology. The XRT7295AT is available in a

20-pin plastic SOJ package for surface mounting.

Two versions of the chip are available, one is for either

DS3 or STS-1 operation (the XRT7295AT, this data

sheet), and the other is for E3 operation (the XRT7295AE,

refer to the XRT7295AE data sheet). Both versions are

pin compatible.

For either DS3 or STS-1, an input reference clock at

44.736MHz or 51.84MHz provides the frequency

reference for the device.

Temperature Range

Integrated Line Receiver

-40°C to + 85°C

Operating

DS3/Sonet STS-1

December 2000-2

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