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参数资料
| 型号： | AN1568D |
| 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： | 4/10页 |
| 文件大小： | 88K |
| 代理商： | AN1568D |
AN1568/D
http://onsemi.com
4
Capacitive Coupling LVDS to ECL
Capacitive Coupling LVDS to ECL Using V
BB
Several ECL devices provide an externally accessible
V
BB
(V
BB
≈
V
CC
–1.3V) reference voltage. This ECL
reference voltage can be used for differential capacitive
coupling. The 10 nF capacitor can be used to decouple V
BB
to GND. (Figure 3)
Figure 3. Capacitive Coupling LVDS to ECL
Using V
BB
LVDS
Z = 50
Z = 50
100
ECL
1 k
1 k
V
BB
10 nF
10 pF
10 pF
Capacitive Coupling LVDS to ECL with External
Biasing
If V
BB
reference voltage is not available, equivalent DC
voltage can be generated using a resistor divider network.
The resistor values depend on V
CC
and V
EE
voltages
(Table 3). Stability is enhanced during null signal conditions
if a 50 mV differential voltage is maintained between the
divider networks. (Figure 4)
Table 3. Examples:
V
CC
= GND
V
EE
= 5.0 V
R1 = 1.2 k
R2 = 3.4 k
V
CC
= GND
V
EE
= 3.3 V
R1 = 680
R2 = 1.0 k
V
CC
= GND
V
EE
= 2.5 V
R1 = 100
R2 = 90
Figure 4. Capacitive Coupling LVDS to ECL with
External Biasing
LVDS
Z = 50
Z = 50
100
ECL
R2
R2
R1
10 pF
10 pF
R1
V
CC
V
EE
In the layout for both interfaces, the resistors and the
capacitors should be located as close as possible to the ECL
input to insure reduced reflection and increased signal
integrity.
Capacitive Coupling ECL to LVDS
The ECL output requires a DC current path to V
EE
;
therefore, the pulldown termination resistors, R
T
, are
connected to V
EE
. The Thevenin resistor pair represent the
termination of the transmission line Z = R1 || R2 and
generates an appropriate DC offset level of 1.2 V. (Figure 5)
Figure 5. Capacitive Coupling ECL to LVDS
Z = 50
Z = 50
ECL
R
T
R
T
R1
130
10 pF
10 pF
R1
130
3.3 V
V
EE
R2
80
R2
80
LVDS
An
example
of
capacitive
coupled
LVPECL
(ECLinPS Plus
Device) to LVDS is shown below.
(Figure 6)
Figure 6. Capacitive Coupling LVPECL to LVDS
R2
43
LVPECL
R1
237
R1
237
R3
3.9 k
R3
3.9 k
3.3 V
R4
2 k
R4
2 k
LVDS
3.3 V
2.5 V or 3.3 V
R2
43
10 pF
10 pF
Capacitive Coupling ECL to LVDS Using V
OS
Reference Voltage
Some LVDS devices supply external offset reference
voltage (V
OS
), which can be used for capacitive coupling.
When the transmission line is very short, a parallel
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