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XR-T7295IP Datasheet

  • XR-T7295IP

  • DS3/Sonet STS-1 Integrated Line Receiver

  • 227.89KB

  • 20頁(yè)

  • EXAR   EXAR

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XR-T7295
...the analog plus company
TM
DS3/Sonet STS-1
Integrated Line Receiver
June 1997-3
FEATURES
D
Fully Integrated Receive Interface for DS3 and
STS-1 Rate Signals
D
Integrated Equalization (Optional) and Timing
Recovery
D
Loss-of-Signal and Loss-of-Lock Alarms
D
Variable Input Sensitivity Control
D
5V Power Supply
D
Pin Compatible with XR-T7295E
D
Companion Device to T7296 Transmitter
APPLICATIONS
D
Interface to DS-3 Networks
D
Digital Cross-Connect Systems
D
CSU/DSU Equipment
D
PCM Test Equipment
D
Fiber Optic Terminals
GENERAL DESCRIPTION
The XR-T7295 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. The digital system
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. The receive input has a variable input
sensitivity control, providing three different sensitivity
ORDERING INFORMATION
Operating
Temperature Range
-40擄C to + 85擄C
-40擄C to + 85擄C
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 XR-T7295 device is manufactured using linear
CMOS technology. The XR-T7295 is available in either a
20-pin plastic DIP or 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 XR-T7295, this data sheet),
and the other is for E3 operation (the XR-T7295E, refer to
the XR-T7295E 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.
Part No.
XR-T7295IP
XR-T7295IW
Package
20 Lead 300 Mil PDIP
20 Lead 300 Mil JEDEC SOJ
Rev. 1.05
E1992
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
z
(510) 668-7000
z
FAX (510) 668-7017
1

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