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参数资料
| 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： | 3/10页 |
| 文件大小： | 88K |
| 代理商： | AN1568 |
AN1568/D
http://onsemi.com
3
GLVDS and SLVS
Ground referenced LVDS (GLVDS) is similar to LVDS
except the driver output voltage offset is nearer to ground.
The advantage of GLVDS is the use of very low power
supply voltages (0.5 V).
Similar standard to GLVDS is SLVS (Scalable
LowVoltage Signaling for 400 mV) by JEDEC. The
interface is terminated to ground with 400mV swing and a
minimum supply voltage of 0.8 V.
LVDM
LVDM is designed for double 100
applications. The driver’s output current is two times the
standard LVDS, thus producing LVDS characteristic levels.
terminated
Interfacing
Common mode range inputs are capable of processing
signals with 150 mV to 400 mV amplitude. The ECL input
processes signals up to 1.0 V amplitude. The DC voltage
levels should be within the voltage input HIGH common
mode range (V
IHCMR
).
To interface between these two voltage levels, capacitive
coupling can be used. Only clock or coded signals should be
capacitively coupled. A capacitive coupling of NRZ signals
will cause problems, which can require a passive or active
interfacing.
Table 2. LVDS LEVELS
LVDS
Specification
BLVDS
Specification
MLVDS
Specification
GLVDS
Specification
LVDM
Specification
Symbol
Parameter
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Unit
Condition
Transmitter
V
PP
Output Differen-
tial Voltage
250
400
240
500
480
650
150
500
247
454
mV
V
OS
Output Offset
Voltage
1125
1275
1225
1375
300
2100
75
250
1.125
mV
R
L
Load Resistor
100
27
50
50
Internal To Rx
50
I
OD
Output Differen-
tial Current
2.5
4.5
9
17
9
13
Adjustable
6
mA
Receiver
Input Voltage
Range
0
2400
0
2400
1000
3800
500
1000
0
2400
MV
V
gpd
< 950 mV
(Note 2)
Differential HIGH
Input Threshold
+100
+100
+50
+100
+100
mV
V
< 950 mV
(Note 2)
Differential LOW
Input Threshold
100
100
50
100
100
mV
V
gpd
< 950 mV
(Note 2)
2. Vgpd is the voltage of Ground Potential Delta across or between boards.
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