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參數(shù)資料
| 型號(hào)： | XRT5897 |
| 廠商： | Exar Corporation |
| 英文描述： | Seven-Channel E1 Line Interface (3.3V or 5.0V)(七通道E1 3.3V線接口單元) |
| 中文描述： | 七通道E1線路接口（3.3V或5.0V），（七通道素E1 3.3線接口單元） |
| 文件頁(yè)數(shù)： | 2/20頁(yè) |
| 文件大?。?/td> | 959K |
| 代理商： | XRT5897 |
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XRT5897
2
Rev. 1.10
BLOCK DIAGRAM
Figure 1. XRT5897 Block Diagram
RTIP7 (69)
RXPOS7 (5)
RRING7 (68)
TXCLK7 (87)
TTIP7 (89)
TRING7 (91)
LOSSEL (38)
LOSCNT (73)
RXNEG7 (6)
LOS7 (4)
TXPOS7 (85)
TXNEG7 (86)
Singnal
Peak
Detector
LOS
Detect
Loss
Delay
Counter
MUX
O
Pulse
Shaping
NRZ
To
RZ
Duty
Cycle
Adjust
MUX
0
0
2:1
1:2
R1
RING
RING
TIP
RX INPUT
TIP
TX OUTPUT
Receive
Comparators
Drivers
R2
R3
9.1
R4
9.1
Tranceiver 7
1
1
1
TrLine
Tranceiver 6
Tranceiver 5
Tranceiver 4
Tranceiver 3
Tranceiver 2
Tranceiver 1
V
CC
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 150
for 75
operation, or
240
for 120
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 38) is connected to logic “1” for ITU
G.775 compliant LOS delay, or to logic 0 for user
programmable additional delay.
D
LOSCNT (pin 73) 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 9.1
for both 75
and 120
applications.
D
An approach exists that permits the user to operate
the XRT5897 with a 5V power supply. For more
information, please see application note TAN-12.
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