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參數(shù)資料
| 型號： | AN1568 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Interfacing Between LVDS and ECL |
| 中文描述： | 接口之間的LVDS和ECL |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 88K |
| 代理商： | AN1568 |
AN1568/D
http://onsemi.com
5
termination should be used and placed as close as possible
to the coupling capacitors. (Figure 7)
Figure 7. Capacitive Coupling ECL to LVDS Using
V
OS
Reference Voltage
Z = 50
Z = 50
ECL
1 k
1 k
100 k
V
OS
=
1.2 V
10 pF
10 pF
3.3 V
50
50
V
TT
LVDS
Direct Interfacing
Interfacing from 2.5 V LVPECL to LVDS
Provided that the LVDS receiver can tolerate large input
voltage peak to peak amplitude, 2.5 V LVPECL can be
directly interfaced to LVDS receiver using proper ECL
termination. 2.5 V LVPECL will be able to drive LVDS
receiver with and without internal 100
resistor. (See Figures 8, 9 and 10).
termination
Figure 8. Interfacing 2.5 V LVPECL to LVDS with
External 100 Termination Resistor
100
LVPECL
2.5 V
V
CC
R
T
R
T
LVDS
Z
O
Z
O
Figure 9. Interfacing 2.5 V LVPECL to LVDS with
Internal 100 Termination Resistor
100
LVPECL
2.5 V
V
CC
R
T
R
T
LVDS
Z
O
Z
O
Figure 10. PSPICE Simulation Levels of 2.5V LVPECL
to LVDS Interface with Example Resistor Values
1.50 V
0.78 V
720 mV
LVDS
Input
2.5 V LVPECL
Output
Where R
T
= 75
Furthermore, sreies termination can be used to reduce the
amplitude of the signal as described in AND8020
application note, by placing R
S
resistor between the driver
and the transmission line. (See Figures 11, 12 and 13).
Figure 11. Interfacing 2.5 V LVPECL to LVDS with
Series R
S
and External 100 Termination Resistor
100
LVPECL
2.5 V
V
CC
R
T
R
T
LVDS
Z
O
Z
O
R
S
R
S
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