Active low input?

[mister_e]

If i refer to the datasheet, they suggest 33pF capacitor wit a 4.9152MHz crystal.
Try increasing the capacitor value first.

[CosMecc]

Do you think that the cap difference could be the cause of the ADC instability?

[mister_e]

could be... i've never use this converter, i'm not on your bench, i don't see how you place it on your board (prototype or not) and unfortunately my scope probe are not long enough to reach you

could also be the supply line, wind direction or alien invasion... who knows ?

[CosMecc]

I'm trying with 33pF cap, but nothing new

[CosMecc]

Uhau!
I've found the problem! It isn't the AD7731, but the PIC, I've used the MSBPRE mode to read the data, changing to MSBPOST, it works very fine!!

Thanks

[mister_e]

DOH! i should see it before

Even a superhero may fail

Congratulation!

[sparkysignal116]

Hi everybody,

I have this module at home and i would like to experiment to get the same result but with a PIC16F628A. Will it work?.

I've seen the schematics and all seems to be fit into the processor i am trying to use.
I dont have any idea if the original creator of this thread is still active, but this project seems very exciting to me.