Figure 7. Standard PECL Output Configuration Figure 8. Single Resistor Termination Scheme
Resistor values are typically 140 ohms for
3.3V operation.
Resistor values are typically 84 ohms for 2.5V
operation.
The VCC6 incorporates a standard PECL output scheme, which are un-terminated emitters as shown in Figure 7. There are numerous application notes on
terminating and interfacing PECL logic and the two most common methods are a single resistor to ground, Figure 8, and a pull-up/pull-down scheme as
shown in Figure 9. An AC coupling capacitor is optional, depending on the application and the input logic requirements of the next stage.
LVDS Application Diagrams
V
CC
LVDS
Driver
100
LVDS
Receiver
LVDS
Driver
100
Receiver
OUT+
OUT-
Figure 10 Standard LVDS
Output Configuration
Figure 11. LVDS to LVDS Connection, Internal 100ohm
Figure 12. LVDS to LVDS Connection
Some LVDS structures have an internal 100 ohm resistor on the
External 100ohm and AC blocking caps
input and do not need additional components.
Some input structures may not have an internal 100 ohm
resistor on the input and will need an external 100ohm
resistor for impedance matching. Also, the input may have
an internal DC bias which may not be compatible with
LVDS levels, AC blocking capacitors can be used.
One of the most important considerations is terminating the Output and Complementary Outputs equally. An unused output should not be left un-termi-
nated, and if one of the two outputs is left open it will result in excessive jitter on both. PC board layout must take this and 50 ohm impedance matching
into account. Load matching and power supply noise are the main contributors to jitter related problems.
I remember that when I was in school, I learned about gate circuits and used gate circuits to build a three-person voter. Although it has been a long time, it is still quite classic. Let's use SIMteri...
I used the ixp425 development board from stareast. Since the snapgear version on the CD was a bit old, I simply downloaded the avila software package for IXP425 from gateworks. In the configuration, I...
Has anyone tried running this GD example? When I run it, it prompts me to press the user key. After I simulate pressing it, no new information is printed. When debugging, I find that it is always stuc...
In the EVC software, there is a box to select SDK, but the SDK I want is not there. Then I installed the SDK I need, but I don't know how to select it in this box. I think this question should be a ve...
Analog electronics
京公网安备 11010802033920号
EEWORLD
