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| 型号： | AN1568 |
| 厂商： | ON SEMICONDUCTOR |
| 英文描述： | Interfacing Between LVDS and ECL |
| 中文描述： | 接口之间的LVDS和ECL |
| 文件页数： | 7/10页 |
| 文件大小： | 88K |
| 代理商： | AN1568 |
AN1568/D
http://onsemi.com
7
Figure 16. PSPICE Simulated Voltage Levels of
3.3 V LVPECL to LVDS Interface with Example
Resistor Values
1.07 V
1.39 V
2.37 V
1.52 V
850 mV
320 mV
LVDS
3.3 V LVPECL
V
CM
(LVPECL)
V
CM
(LVDS)
Interfacing from LVDS to LVPECL
The input common mode range of the low voltage ECL
line receivers are wide enough to process LVDS signals.
(Figure 17)
Figure 17. Interfacing LVDS to LVPECL
LVDS
Z = 50
Z = 50
100
LVPECL
3.3 V
2.5 V or 3.3 V
This direct interface is possible for all ECL devices with
sufficiently low minimum differential input HIGH common
mode range inputs. A differentially operated receiver’s
V
IHCMR
minimum must be 1.2 V or less (see device data
sheet).
Table 4. LVDS Input Compatible Devices
EP14
LVEP210S
LVEL37
EL56
EP809
LVE222
LVEL39
EL91
LVEP11
LVEL05
LVEL40
SG11
LVEP14
LVEL11
LVEL51
SG14
LVEP16
LVEL13
LVEL56
SG16
LVEP17
LVEL14
LVEL92
SG16M
LVEP34
LVEL16
EL13
SG16VS
LVEP56
LVEL17
EL14
SG53A
LVEP91
LVEL29
EL17
SG72A
LVEP111
LVEL32
EL29
SG86A
LVEP210
LVEL33
EL39
SG111
Interfacing from PECL to LVDS
Since the output levels V
OH
and V
OL
of 5 V PECL are
more positive than the input range of LVDS receiver, special
interface is required. (See Figure 18). Furthermore, the open
emitter design of the ECL output structure need proper
termination, which can be incorporated with the resistor
divider network to generate a proper LVDS DC levels (eq.
3).
R1
R2
RT
(eq. 3)
The resistor divider network will divide the output
common mode voltage of PECL (V
CM
(PECL)) to input
common mode voltage of LVDS (V
CM
(LVDS)).
R2
R1
R2
VCM(LVDS)
VCM(PECL)
(eq. 4)
Where:
R
T
= Termination Resistor
V
CM
(PECL) = Common Mode Voltage
V
CM
(LVDS) = Common Mode Voltage
The above equations may give non—standard resistor
values and when choosing resistors off the shelf, to avoid
cutoff condition under worstcase scenario.
Figure 18. Interfacing 5 V PECL to LVDS
Examples:
For 50 controlled impedance, the resistor values for 5V
PECL converted to LVDS voltage levels are as follows:
PECL
LVDS
5 V
V
CC
R1
R1
R2
R2
Z
O
Z
O
Z
O
Z
O
R
1
= 134
R
2
= 66
R
T
= 200
V
CM
(PECL) = 3.65 V
V
CM
(LVDS) = 1.2 V
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|---|---|
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