參數(shù)資料
型號： XRT7302
廠商： Exar Corporation
英文描述： 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元)
中文描述： 2頻道E3/DS3/STS-1線路接口單元（2通道E3/DS3/STS-1線接口單元）
文件頁數(shù)： 17/62頁
文件大?。?/td> 715K
代理商： XRT7302
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2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7302
REV. 1.1.6
13
73
TTIP0
O
Transmit TTIP Output - Channel 0:
The XRT7302 uses this pin with TRing0 to transmit a bipolar line signal via a
1:1 transformer.
74
AVDD
****
Transmit Analog VDD - Channel 0
75
MRing0
I
Monitor Ring Input - Channel 0:
The bipolar line output signal from TRing0 is connected to this pin via a 270-
ohm resistor to check for line driver failure. This pin is internally pulled "High".
76
MTIP0
I
Monitor Tip Input - Channel 0:
The bipolar line output signal from TTIP0 is connected to this pin via a 270-
ohm resistor to check for line driver failure. This pin is internally pulled "High".
77
TNData0
I
Transmit Negative Data Input - Channel 0:
The XRT7302 samples this pin on the falling edge of TxClk0. If it samples a
"1", then it generates and transmits a negative polarity pulse to the line.
N
OTES
:
1. This input pin is ignored and tied to GND if the Transmit Section is
configured to accept Single-Rail data from the Terminal Equipment.
2. If operating in the HOST Mode, it can be configured to sample the
TNData0 pin on either the rising or falling edge of TxClk0.
78
TPData0
I
Transmit Positive Data Input - Channel 0:
The XRT7302 samples this pin on the falling edge of TxClk0. If it samples a
"1", then it generates and transmits a positive polarity pulse to the line.
N
OTES
:
1. The data should be applied to this input pin if the Transmit Section is
configured to accept Single-Rail data from the Terminal Equipment.
2. If the XRT7302 is operating in the HOST Mode it can be configured to
sample the TPData0 pin on either the rising or falling edge of TxClk0.
79
TxClk0
I
Transmit Clock Input for TPData and TNData - Channel 0:
This input pin must be driven at 34.368 MHz for E3 applications, 44.736 MHz
for DS3 applications or 51.84 MHz for SONET STS-1 applications. The
XRT7302 uses this signal to sample the TPData0 and TNData0 input pins. By
default, the XRT7302 is configured to sample these two pins on the falling
edge of this signal.
If operating in the HOST Mode, the XRT7302 can be configured to sample the
TPData0 and TNData0 input pins on either the rising or falling edge of TxClk0.
80
TxOFF0
I
Transmitter OFF Input - Channel 0:
Setting this input pin "High" configures the XRT7302 to turn off the Transmit
Section of Channel 0. In this mode, the TTIP0 and TRing0 outputs is tri-
stated.
N
OTES
:
1. This input pin controls the TTIP0 and TRing0 outputs even when the
XRT7302 is operating in the HOST Mode.
2. For HOST Mode Operation, tie this pin to GND if the Transmitter is
intended to be turned off via the Microprocessor Serial Interface.
PIN DESCRIPTION
P
IN
#
S
IGNAL
N
AME
T
YPE
D
ESCRIPTION
相關(guān)PDF資料
PDF描述
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