SOLVED: How can I reduce ADC jitter

[Demon]

I do not think you can see the Revision of your chip with Melabs USB programer. Only with Microchips IDE and a Pickit or ICD programers.

That's what I'm afraid of. I never got my PK4 to work right.

1. Can you test with increased conversion time as the Errata says?

I could try that.

2. Can you test with Vdd reference instead of FVR to be sure of the cause of this jitter? In this case use a linear 5V regulator to have the cleanest Vdd power supply.

Ioannis

I was using VDD before, jittery. I'm using FVR x 4 right now, still jittery.

And 7805 can't handle 3A anyways. That's why I switched to TPS56637 design.

[Ioannis]

Is it possible to just feed a clean 5V to this chip, just to test the ADC?

Ioannis

[Demon]

Have to go to restaurant for wife's birthday. Gonna try 2 bench power supplies later.

[Ioannis]

Absolutely, wife is coming first!

So you will have a peacefull rest of the day!

When you will test it, please try also instead of a pot, just a voltage divider, say two 1K resistor in series to feed half of the supply to the adc. Maybe it is a pot problem.

Ioannis