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XR-T56L22AD Schematic ( PDF Datasheet ) - Exar Corporation

Teilenummer XR-T56L22AD
Beschreibung Low Power Repeater/Receiver
Hersteller Exar Corporation
Logo Exar Corporation Logo 




Gesamt 16 Seiten
XR-T56L22AD Datasheet, Funktion
...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-T56L22AD Datasheet, Funktion
XR-T56L22
ELECTRICAL CHARACTERISTICS (CONT’D)
Parameter
Pin Min. Typ. Max. Unit
Clock Output Stage
Output Pulse Rise Time (Tr)
11
40 ns
Output Pulse Fall Time (Tf)
11
40 ns
Output Pulse Width (Tw)
11 224
264 ns
Shunt Regulator
Output Voltage
12
4.85 5.1 5.35
V
Voltage Regulation Over Temp.
12
-0.02
%/°C
Load Regulation
12
0.027 %/mA
Note
1 Using a 2K pull up resistor between 11 and VCC and 15pF capacitance to GND.
Conditions
1
Pin 13, 14 floating
Pin 13, 14 floating
1mA to 100mA load
ABSOLUTE MAXIMUM RATINGS
Storage Temperature . . . . . . . . . . . . . . -65°C to 150°C
Operating Temperature . . . . . . . . . . . . . -40°C to 85°C
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . -0.5 to 7V
Supply Voltage Surge (10ms) . . . . . . . . . . . . . . . . . 25V
Data Output Voltage (pin 9, 10) . . . . . . . . . . . . . . . 12V
SYSTEM DESCRIPTION
With reference to the functional block diagram, the basic
operation of the XR-T56L22 may be described as follows:
The received bipolar signal, is applied to a linear amplifier
and automatic equalizer. These circuits provide the
necessary amount of gain and phase equalization to
recover the transmitted data, and band limit the signal, to
optimize repeater performance for near-end crosstalk
produced by other systems operating within the same
cable bundle.
The preamplifier output signals which are balanced and of
opposite phase, are applied to the clock extraction and
pulse regenerator circuits. Here they are rectified and
then applied to a high Q resonant circuit which extracts
the 1.544/2.048 Mbps frequency component from the
received signal. This signal is then sliced and fed to an
adjustable phase shift circuit. A second slicer is used to
control the time at which the output signals from the
preamplifier are sampled by the pulse regenerator
circuits. The phase shifted clock signal is made available
as an output from the circuit for interface applications. The
clock phase adjustment is performed with a single pin
using an external resistor. Adjustment of the position of
the clock sampling edge by the phase shift circuit allows
performance of the pulse regenerator to be optimized.
The pulse regenerator performs the sampling and data
slicing to regenerate the appropriate output pulse. These
pulses are applied to an external output transformer to
create the bipolar signal that drives the next section of
twisted pair.
Rev. 1.02
6

6 Page









XR-T56L22AD pdf, datenblatt
XR-T56L22
18 LEAD PLASTIC DUAL-IN-LINE
(300 MIL PDIP)
Rev. 1.00
18
1
Seating
Plane
A
L
B
10
E1
9
D
A2
A1
e B1
E
αC
eA
eB
Rev. 1.02
SYMBOL
INCHES
MIN MAX
MILLIMETERS
MIN MAX
A
0.145 0.210
3.68 5.33
A1
0.015 0.070
0.38 1.78
A2
0.115 0.195
2.92 4.95
B
0.014 0.024
0.36 0.56
B1
0.030 0.070
0.76 1.78
C
0.008 0.014
0.20 0.38
D
0.845 0.925
21.46 23.50
E
0.300 0.325
7.62 8.26
E1
0.240 0.280
6.10 7.11
e
0.100 BSC
2.54 BSC
eA
0.300 BSC
7.62 BSC
eB
0.310 0.430
7.87 10.92
L
0.115 0.160
2.92 4.06
α
0° 15°
0° 15°
Note: The control dimension is the inch column
12

12 Page





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