xrt5894 Exar Corporation, xrt5894 Datasheet - Page 2

• Manufacturer Part Number: xrt5894
• Description: Four-channel E1 Line Interface 3.3v Or 5.0v
• Manufacturer: Exar Corporation

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