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XR-T5760 Datasheet Preview

XR-T5760 Datasheet

T148C & 2M Bitls Repeater

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XR·T5760
Low Power T1, T148C & 2 M Bitls Repeater
GENERAL DESCRIPTIDN
The XR-T5760 is a low power version of the XR-T5700
repeater circuit for Tl carrier system operating at
1.544 M bitls (Tl), European 2 M bitls or 2.37 M bitls
(TI48C). It provides all of the active circuitry required
for one side of a PCM repeater and also has the cability
of clock extraction using a crystal filter.
Clock recovery using an LC tank circuit instead of a
crystal filter is also available as XR-T5660.
FEATURES
Low Power
Crystal Filter Clock Extraction
Single 5.1 V Power Supply
Less than 10 ns Sampling Pulse Over the Operating
Range
Triple Matched Automatic Line Build-out (ALBO) Ports
2 M Bitls Capability
APPLICATIONS
Tl PCM Repeater
T148C PCM Repeater
European 2 M Bitls PCM Repeater
TIC PCM Repeater (requires external preamplifier)
ABSOLUTE MAXIMUM RATINGS
Storage Temperature
-65°C to +150C
Operating Temperature
-40°C to +85°C
Supply Voltage
-0.5 to +10V
Supply Voltage Surge (10 ms)
+25V
Input Voltage (except Pins 2,3,4,17)
-0.5 to 7V
Input Voltage (Pins 2,3,4,17)
- 0.5 to + 0.5V
Data Output Voltage (Pins 10,11)
20V
Voltage Surge (Pins 5,6,10,11) (10 msec only) 50V
ORDERING INFORMATION
Part Number
XR-T5760
Package
Ceramic
Operating Temperature
-40°C to +85°C
SYSTEM DESCRIPTION
The XR-T5760 is a monolithic bipolar PCM repeater IC
operating at 1.544 (Tl), 2.048 and 2.37 (TI48C) M bitsl
sec. It is the low power version of XR-T5720 PCM re-
FUNCTIONAL BLOCK DIAGRAM
ALBO GROUND
ANALOG GROUND
SUBSTRATE GROUND -"'1,tl..lll"Q.
ALBO
PORT 1
ALBO
PORT 2
ALBO
PORT 3
AMPLIFIER
-VE INPUT
AMPLIFIER
+VEINPUT
-veAMPLIFIER
OUTPUT
+vAeMOPULTIFPIEURT
GAOUND
CLOCK
DRIVE
ALBO
CONTROL
CLOCK
AMPL.IFIER
INPUT
CLOCK
AMPLIFIER
INPUT
Vee
CLOCK
- - - L ' - = - ' OUTPUT
PHASE SHIFTED
CLOCK INPUT
.... EDAlA
OUTPUT
+VE DATA
OUTPUT
peater IC. It contains all the active circuitry to imple-
ment one side of a PCM, repeater operating on either
pulp or plastic insulated cables. Repeater to repeater
spacing on either type of cable is 6300 ft. max.
Bipolar PCM signal is attenuated and dispersed in time
as it travels along the transmission cable, characteris-
tics of which vary with length, frequency, temperature
and humidity. The PCM Signal when received is ampli-
fied, equalized for amplitude characteristics and recon-
structed by the preamplifier, automatic line build out
(ALBO), clock and data threshold circuits. Amplitude
equalization is achieved through shaping the frequency
spectrum with the help of variable impedance ALBO
ports.
Timing information is contained in the incoming pulse
stream. This signal is full wave rectified and applied to
a crystal filter circuit to extract the clock signal at the
data rate. The clock signal is amplified and phase
shifted between Pins 13 and 12 to obtain 90° phase
shift by means of an R-L-C circuil.
Data is sampled and stored in the output data latches
by an internally generated sampling pulse. Buffer driv-
ers are then enabled to produce precisely timed output
pulses whose width and time of occurence are con-
trolled by the regenerated clock.
1-464




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XR-T5760 Datasheet Preview

XR-T5760 Datasheet

T148C & 2M Bitls Repeater

No Preview Available !

ELECTRICAL CHARACTERISTICS
Test Conditions: VCC = 5.1 V ±5%, TA =25°C, unless specified otherwise.
PARAMETERS
Supply Current
Clock and Data Output
Output Leakeage Current
Amplifier Pin Voltages
Amplifier Output
Offset Voltage
Voltage Swing
Amplifier Input
Bias Current
ALBO on Current
Drive Current
AC CHARACTERISTICS
Pre-Amplifier
AC Gain at 1 MHz
Input Impedance
Output Impedance
Clock Amplifier
AC Gain
- 3 dB Bandwidth
Delay
Output Impedance
ALBO
Off Impedance
On Impedance
DATA OUTPUT BUFFERS
MIN TYP MAX UNIT
14 mA
0 100 pA
2.4 2.9 3.4
V
-50 0 50 mV
2.2 V
5 p.A
3 mA
1 mA
50 dB
20 kO
200 0
32 dB
10 MHz
10 ns
200 0
20 kO
25 0
Rise Time
Fall Time
Output Pulse Width
Sample Pulse Width
VOL
IL sink
THRESHOLDS
ALBO
Clock Drive Current Peak
CLOCK THRESHOLD
% of ALBO
DATA THRESHOLD
% of ALBO
30 ns
30 ns
244 ns
10 ns
0.7 V
35 mA
1.4 1.5 1.6
V
1.0 mA
63 68 75 %
40 46 52 %
XR·T5760
CONDITIONS
ALBO Off
Vrull-u~ =15V
A DC nity Gain
Rs = 8.2 kO
Measured Differentially
from Pin 8 to Pin 7
RL = 1300, Vpull-up =
5.1 V ±5%
At Vo =VALBOThreshold
1-465


Part Number XR-T5760
Description T148C & 2M Bitls Repeater
Maker Exar
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