xrt5897 Exar Corporation, xrt5897 Datasheet - Page 2

• Manufacturer Part Number: xrt5897
• Description: Xrt5897 -seven-channel E1 Line Interface
• 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 38) is connected to logic “1” for ITU
TX OUTPUT
RX INPUT
XRT5897
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.
Rev. 1.11
RING
RING
TIP
TIP
BLOCK DIAGRAM
1:2
2:1
9.1
9.1
R3
R4
R1
R2
RTIP7 (69)
RRING7 (68)
LOSCNT (73)
LOSSEL (38)
TTIP7 (89)
TRING7 (91)
Transmit
Drivers
Line
Figure 1. XRT5897 Block Diagram
V
CC
Shaping
Pulse
Detector
Singnal
Peak
Tranceiver 7
Tranceiver 6
Detect
2
LOS
Tranceiver 5
MUX
D LOSCNT (pin 73) 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
D An approach exists that permits the user to operate
Tranceiver 4
logic 1, or connected to an external clock when
LOSSEL is logic 0.
with a 1:2 ratio transformer.
applications.
the XRT5897 with a 5V power supply. For more
information, please see application note TAN-12.
Tranceiver 3
0
0
1
1
Tranceiver 2
Tranceiver 1
NRZ
Counter
Delay
To
RZ
Loss
Adjust
Cycle
Duty
1
O
MUX
Receive
Comparators
TXNEG7 (86)
TXPOS7 (85)
TXCLK7 (87)
RXNEG7 (6)
RXPOS7 (5)
LOS7 (4)