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Exar Corporation |
...the analog plus companyTM
XR-T56L22
Low Power
Repeater/Receiver
FEATURES
D Contains All The Active Components For A PCM
Repeater Or Long Haul Line Receiver
D Low Voltage Operation (5.1V)
D Low Power Consumption (8.75mA Max)
D 2Mbps Operation Capability
D Dual Matched ALBO Ports
D Internal Adjustable Phase Shift Circuitry
D Extracted Clock Output
D Internal Shunt Regulator
D Temperature Independent Current Biasing
APPLICATIONS
June 1997-3
D T1 PCM Repeater/Receiver
D T148C PCM Repeater/Receiver
D European 2.048Mbps PCM Repeater/Receiver
D Digital Multiplexers, CSUs, Switching Equipment
D ISDN Compatible Equipment: Fax Machines,
Computers etc.
GENERAL DESCRIPTION
The XR-T56L22 is a very low power monolithic repeater/
receiver IC designed for PCM carrier systems operating
between 1.544Mbps and 2.37Mbps. The IC provides all
the active circuitry required to implement one side of a
PCM repeater. The XR-T56L22 features on-chip
adjustable phase shifting, an extracted clock output and
an on-board shunt regulator. The very low power
consumption of the device makes it ideal for long haul
“tandem” repeater applications.
ORDERING INFORMATION
Part No.
XR-T56L22AP
XR-T56L22AN
XR-T56L22AD
Package
18 Lead 300 Mil PDIP
18 Lead 300 Mil CDIP
18 Lead 300 Mil Jedec SOIC
Operating
Temperature Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Rev. 1.02
E1997
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017
1
XR-T56L22
BLOCK DIAGRAM
ALBO1
2
ALBO2
ANA GND
3
1
AMP + I/P
AMP - I/P
5
4
+
AMP
-
Clock
Bias
GEN.
16
LC I/P
17
LC Bias
15
Phase Cont.
Clock
AMP
Voltage
Ref.
Gen.
13
VREF
14
REG Cont.
12
VCC
Volt.
Reg.
+5
8
DIG GND
ALBO
PEAK
DET.
Clock
Comparators
18
ALBO FIL
6
AMP -O/P
7
AMP +O/P
Clock
Driver
11
Clock O/P
Data
Comparators
DQ
CLK
Data
Latches
DQ
CLK
Output
Drivers
9
Data +
10
Data -
Figure 1. XT-T56L22 Block Diagram
Rev. 1.02
2
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