Analog signal to multiple ADC inputs

Nuba,

Do you have a specific concern?

There is nothing inherently wrong with the idea of connecting a single signal to multiple ADCs.  Care should be taken to make sure that the signal has sufficient strength to drive the filtering and sample capacitors of all of the ADC inputs, which it sounds like you have done by buffering the signal.

-Tommy

Hi Tommy

Yes I am using the buffer to provide enough current to the ADC inputs.

Moreover, I am going to use this AO to do some low frequency filtering as I said. 

But there is something else that worries me. Since the AO output needs to drive 3 ADC inputs, some paths may be too long (from the AO to the ADC). I am worried about high speed noise after de AO, so I am thinking about adding an RC filter right before each input.

I read some datasheets and they say that for the TMS320f28335 R should be 100 ohm max and C>= 10* CSH >= 16pF.

I was thinking about R=100 and C=10nF to have a cut  frequency about 160 KHz.

Do you see any problem on this?

Thanks a lot.

Nuba.