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=s]This post was last edited by aowei123 on 2020-5-26 16:37[/i]I just came across the IPC-7351 software. I have to fill in the plug-in drilling diameter and shape. How do I select the Fabrication Le...
I bought a third-party handheld terminal device (with our own software embedded in it). The operating temperature in the specification sheet is -20 to +55 degrees. We tested the aging condition at -20...
[size=4][color=#000000][backcolor=white]A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components are the primary coil, the secondary coi...
[i=s]This post was last edited by freeelectron on 2022-4-19 17:31[/i]1. Introduction
This article uses AT32F425 to drive RC522 to test the rate of SPI1. For detailed code operation of RC522, please re...
PCB Design
京公网安备 11010802033920号
EEWORLD
