參數(shù)資料
型號: OCX160
廠商: Electronic Theatre Controls, Inc.
英文描述: OCX160 Crosspoint Switch
中文描述: OCX160交叉點開關(guān)
文件頁數(shù): 22/44頁
文件大?。?/td> 710K
代理商: OCX160
OCX160 Crosspoint Switch
Preliminary Data Sheet
22
[Rev. 1.6] 2/20/01
I-Cube, Inc.
3. Differential I/O Standards
The OCX160 support the two most popular differential signaling standards: Low Voltage Differential Signaling
(LVDS) and Low Voltage Positive Emitter Coupled Logic (LVPECL).
LVDS is typically used in communication systems as high speed, low noise point-to-point links. The OCX160
conforms to the ANSI/TIA/EIA-644 standard covering electrical specifications for output drivers and receiver
inputs.
LVPECL is commonly used in video switching applications or those designs requiring transmission of high-
speed clock signals.
3.1
LVDS
LVDS is a differential signaling standard. It requires that one data bit is carried through two signal lines.
As with all differential signaling standards, LVDS has an inherent noise immunity over single-ended
standards. The voltage swing between two signal lines is approximately 350mV. The use of a reference
voltage or a board termination voltage is not required. LVDS requires the use of two pins per input or
output. LVDS requires external resistor termination.
Transmitting and receiving circuits for LVDS are shown in Figures 7 and 8.
Figure 7
Transmitting LVDS Signal Circuit
Figure 8
Receiving LVDS Signal Circuit
V
DD
.PAD=2.5V
LVDS Output
2.5V
Data
Transmit
OCX
Device
to LVDS Receiver
to LVDS Receiver
165
165
OUTP
R
DIV
140
Z
0
=50
Z
0
=50
R
S
R
S
OUTN
Data
Recieve
OCX
Device
Z
0
=50
Z
0
=50
from LVDS
Driver
INP
100
R
T
INN
+
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