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PDF ( 数据手册 , 数据表 ) XR-T7295

零件编号 XR-T7295
描述 DS3/Sonet STS-1 Integrated Line Receiver
制造商 Exar Corporation
LOGO Exar Corporation LOGO 


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XR-T7295 数据手册, 描述, 功能
...the analog plus companyTM
XR-T7295
DS3/Sonet STS-1
Integrated Line Receiver
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
June 1997-3
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
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.
ORDERING INFORMATION
Part No.
XR-T7295IP
XR-T7295IW
Package
20 Lead 300 Mil PDIP
20 Lead 300 Mil JEDEC SOJ
Operating
Temperature Range
-40°C to + 85°C
-40°C to + 85°C
Rev. 1.05
E1992
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017
1







XR-T7295 pdf, 数据表
XR-T7295
10000.....ÎÎÎÎÎÎÎÎÎÎ008642 ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
-1.0 -0.5
0
0.5 1.0 1.5 2.0
Time Slots - Normalized To Peak Location
Figure 4. DSX-3 Isolated Pulse Template for ACCUNET T45 Standards
Lower Curve
Time
Function
T -0.36
-0.36  T+0.28
0
0.5 ƪ 1+sin π/2 [1+T/0.18]ƫ
0.28  T
0.11e-3.42(T-0.3)
Upper Curve
Time
Function
T  -0.65
-0.65  T 0
0
1.05 ƪ1-e-4.6(T+0.65)ƫ
0  T  0.36
0.5 ƪ 1+sinπ/2 [ 1+T/0.34]ƫ
0.36  T
0.05+0.407e-1.84(T-0.36)
Table 4. DSX-3 Pulse Template Boundaries for G.703 Standards (See Figure 5)
10000.....008642-1ÎÎÎÎÎÎÎÎÎÎÎ.0 ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ-0.5ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ0ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ0Î.5 ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ1.0ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ1.5ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ2ÎÎÎÎÎÎÎÎÎÎÎ.0
Time Slots - Normalized To Peak Location
Figure 5. DSX-3 Isolated Pulse Template for G.703 Standards
Rev. 1.05
8







XR-T7295 equivalent, schematic
XR-T7295
INPUT
SIGNAL
B1
EXTERNAL
CLOCK
B2
VCC
OUTPUTS
RECEIVER
MONITOR
RLOS
RLOL
RI
EC
QT
B
S1 5 6 7 8
SW DIP-4
4321
L
O
S
T
H
R
TP TP
135 7
R21
U1 22K
C2
0.01µF
R2
75
XR-T7295
8
RLOL
7 RLOS
2
RIN
19
LOSTHR
REQB 18
ICT/ 17
RCLK 14
RNDATA 15
RPDATA 16
3
TMC1
24 6 8
R1 50
P2
R7
R8
R10
39
39
39
GND
13
EXCLK
6
TMC2
R5 50
B5
R6 4
LPF1
75
C3
0.1µF
5
LPF2
GNDA
GNDC
GNDD
1
10
9
TCLK
B4
TNDATA
FERRITE BEAD
V
D
D
A
20
BT1
VV
DD
DD
CD
11
21
C6
B3
TPDATA
C4
0.1µF
0.1µF
P1
VCC RX
C7
0.1µF
+ E1
22µF
DMO
BPV
TRANSMITER
MONITOR
OUTPUTS
VCC
2134 5678
U2
XR-T7296
3
LLOOP
2
1 RCLK
RLOOP 4
DS3,STS-1/E3/
TAOS 5
28 RNDATA
ICT/ 26
27 RPDATA
TXLEV 25
ENCODIS 11
DECODIS 12
9 TCLK
17
RCLKO
16
RPOS
15
RNEG
14
RNRZ
R22
22K
1 1111119
5 64 3 2 1 0
S2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SW DIP-8
RCLKO
RPOS
RNEG
RNRZ
RECEIVER
OUTPUTS
LLOOP
RLOOP
T3/E3
TAOS
TXLEV
ICT
ENCODIS
DECODIS
8 TNDATA
7 TPDATA
18 DMO
13 BPV
V
D
D
A
24
BT2
TRING 22
R4 36
T1 B6
TTIP
23
TTIP
R15
MRING 19
R16
20
MTIP
10
GNDD
GNDA 21
R3
270
270
36
PE65966
TRING
TRANSFORMER # PULSE ENGINEERING
PE 65966
PE 65967 IN SURFACE MOUNT
V
D
D
D
6 C8
0.1µF
P3
VCC TX
FERRITE BEAD # FAIR RITE 2643000101
C9 FERRITE BEAD
0.1µF
+E2
22µF
C5
0.1µF
Figure 13. Typical Application Schematic
Rev. 1.05
16










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