One of the most important factors in getting good
performance from Auto-Lock is to design the PCB with the highest signal integrity
possible by following the recommendations below:
- Place the ADC chip as close to the VESA/Video connectors as
possible.
- Avoid crosstalk to the analog signals by keeping them away
from digital signals
- Do not place the digital ground or power planes under the
analog area between the VESA connector to the ADC chip.
- Avoid crosstalk onto the RGB analog signals, by separating
them from the VESA Hsync and Vsync signals.
- Analog power must not be shared with the digital power
directly.
- Try to keep the trace lengths of the RGB as equal as
possible.
- Use good quality (1%) termination resistors for the RGB
inputs to the ADC
- If the green channel must be connected to more than the ADC
green input and ADC sync-on-green input, provide a good quality high
impendence buffer to avoid adding noise to the green channel.