900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






Exar

XR-T5720 Datasheet Preview

XR-T5720 Datasheet

PCM Line Repeater

No Preview Available !

EX4R
XR-T5700/T5720
T 1, T 148C, & 2 M Bitls PCM Line Repeater
GENERAL DESCRIPTION
FUNCTIONAL BLOCK DIAGRAM
The XR-T5700/T5720 is a bipolar monolithic repeater IC
that provides all the active circuits required for one side of
a PCM repeater. The IC is designed for clock extraction by
using a crystal filter.
The primary applications of XR-T5700 are T1 (1.544 M
bit/sl. T148C (2.37 M bit/sl. and European 2 M bit/s PCM
repeater.
A tank circuit clock extraction version of XR-T5700-T5720
is available as XR-T5600/T5620.
FEATURES
Crystal Clock Extraction
Single 5.1 V Power Supply
Less than 10 ns Sampling Pulse over the Operating Range
Triple Matched ALBO Ports
ALBO GROUND
ANALOG GROUND
SUBSTRATE GROUND
-.....,nl~n
ALBO
PORT 1
ALBO
PORT 2
ALBO
PORT 3
AMPLIFIER
-VE INPUT
AMPLIFIER
+VE INPUT
AMPLIFIER
-VE OUTPUT
AMPLIFIER
+VE OUTPUT
GROUND
CLOCK
DRIVE
ALBO
CONTROL
CLOCK
AMPLIFIER
CLOCK
AMPLIFIER
INPUT
VCC
CLOCK
_ _ _ I _ - . OUTPUT
PHASE SHIFTED
CLOCK INPUT
-VE DATA
OUTPUT
·VE DATA
OUTPUT
APPLICATIONS
T1 PCM Repeater
T148C PCM Repeater
T1C PCM Repeater (requires external preamplifier)
European 2 M Bit/s PCM Repeater
ABSOLUTE MAXIMUM RATINGS
Storage Temperature
-65°C to +150°C
Operating Temperature
_40° C to +85° C
Supply Voltage
-0.5 to +10 V
Supply Voltage Surge (10 ms)
+25V
Input Voltage(except Pins 2,3,4,17)
-0.5 to 7 V
Input Voltage (Pins 2,3,4,17)
-0.5 to +0.5 V
Data Output Voltage (Pins 10, 11)
20V
Voltage Surge (Pins 5,6,10,11) (10 msec only)
50V
ORDERING INFORMATION
Part Number
Package Operating Temperature
XR-T5700/T5720 Ceramic
-40°C to +85°C
SYSTEM DESCRIPTION
The X R-T5700/T5720 performs most of the functions
required for one side of a PCM repeater operating at 2 M
bit/s or similar baud rate. The integrated circuit amplifies
the received positive and negative pulses and feeds them
into Automatic Line Build-out (ALBOl. clock and data
threshold detectors, see Figure 1. The ALBO threshold
detector ensures that the received pulses at Pins 7 and 8
have the correct amplitude and shape. This is carried out by
controlling the gain and frequency shaping of the ALBO
network with three variable impedance ALBO ports.
The clock threshold detector extracts timing information
from the pulses received at Pins 7 and 8 and passes it into
open collector Pin 18. A crystal filter is connected from
Pin 18 to clock amplifier input Pins 16 and 15. The sin-
usoidal-type waveform is amplified into a square wave at
Pin 13, and forwarded through an external phase shift
network into Pin 12. This waveform provides the data
sampling pulse which opens latches into which the data
from the data threshold detectors is passed. The resulting
pulses are stored for half a bit period (normally 488 ns
for 2 M bit/s) in the latches. They appear as half-width
output pu Ises at Pins 10 and 11.
2-50




Exar

XR-T5720 Datasheet Preview

XR-T5720 Datasheet

PCM Line Repeater

No Preview Available !

XR-T5700
ELECTRICAL CHARACTERISTICS
Test Conditions: TA = 25°C, VCC = 5.1 V ± 5%, unless specified otherwise (see Figure 1).
PARAMETERS
PINS MIN. TYP. MAX. UNIT
CONDITIONS
Supply Current
14 22 30 mA
Data Output Leakage Current 10,11
0 100 pA
ALBO Port Off Voltage
2,3,4
0 0.1 V
Amplifier Pin Voltage
5,6,7,8 2.4 2.9 3.4
V
Vpull-up = 15 V, Vcc = 5.35 V
DYNAMIC CHARACTERISTICS AMPLIFIER
Output Offset Voltage
ACGin@ 1 MHz
Input Impedance
Output Impedance
-50 0 50 mV
47 50 53 dB
20 kn
200 n
Rs = 8.2 kn
ALBO
ALBO Off Impedance
ALBO On Imepdance
20 25 kn
25 n
THRESHOLDS
ALBO Threshold
1.4 1.5 1.6
V
Clock Threshold as % of ALBO Threshold 68
80 %
DATA Threshold as % of ALBO Threshold 42
49 %
Clock Drive Current
0.7 1.4 mA
()UTPUT STAGES
At Vo =VALBO Threshold
RL = 130n, Vpull-up = 5.1 ± 5%
Output Pulse Rise Time
Output Pulse Fall Time
Output Pulse Width
Output Pulse Width Differential
Buffer Gate Voltage (Low)
Buffer Gate Voltage Differential
40
40
224 244 264
-10 +10
0.65
0.95
-0.15
0.15
ns
ns
ns
ns
V
V
2-51


Part Number XR-T5720
Description PCM Line Repeater
Maker Exar
Total Page 9 Pages
PDF Download

XR-T5720 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 XR-T5720 PCM Line Repeater
Exar





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy