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XRT5894 Datasheet(PDF) 2 Page - Exar Corporation

Part # XRT5894
Description  Four-Channel E1 Line Interface (3.3V or 5.0V)
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT5894 Datasheet(HTML) 2 Page - Exar Corporation

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XRT5894
2
Rev. 1.10
To
BLOCK DIAGRAM
Figure 1. XRT5894 Block Diagram
RTIP4 (43)
RRING4 (42)
LOSSEL (25)
TXCLK4 (51)
TTIP4 (53)
TRING4 (55)
LOS4 (48)
TXPOS4 (49)
TXNEG4 (50)
RXNEG4 (46)
RXPOS4 (47)
LOSCNT (45)
Signal
Peak
LOS
Detect
Loss
Delay
Mux
O
Pulse
Shaping
NRZ
Duty
Cycle
Mux
0
2:1
1:2
R1
RING
RING
TIP
RX Input
TIP
TX OUTPUT
Receive
Comparators
Line
Drivers
R2
R3
9.1
R4
9.1
Transceiver 2
Transceiver 1
Transceiver 3
Tranceiver 4
Detector
Counter
1
RZ
Adjust
0
1
1
Transmit
VCC
Receiver Notes
D
The same type 1:2CT ratio transformer may be
used at the receiver input and transmitter output.
D
R1 and R2 are both 150W for 75W operation, or
240W for 120W operation.
D
Return loss exceeds ITU G.703 specification with
these resistors and a 1:2CT ratio input transformer.
LOS (Loss of Signal) Notes
D
LOSSEL (pin 25) is connected to logic “1” for ITU
G.775 compliant LOS delay, or to logic 0 for user
programmable additional delay.
D
LOSCNT (pin 45) is unconnected when LOSSEL is
logic 1, or connected to an external clock when
LOSSEL is logic 0.
Transmitter Notes
D
Return loss exceeds ETSI 300 166 specification
with a 1:2 ratio transformer.
D
R3 and R4 are always 9.1W for both 75W and 120W
applications.


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