hi, I have interfaced ADS7825 (in Parallel Mode) with AT90USB1286 microcontroller and I am able to get16-bit data from ADS7825 . But I came across a weird problem, let me explain about what I did: I used channel 0 and reaming channels are connected to ground. Now I have given 2 V from Function generator( made by Agilent technologies) and I got 1.995V, good no problem for me here. after this I removed the function generator, given 2V to channel 0 (of ADS7825 ) which is coming from an amplifier(LM324N based instrumentation amplifier followed by the differential amplifier), now I am getting varying voltage i.e 1.5V to 2.2V. i am not getting a constant voltage. now i removed the amplifier and I checked the amplifier output whether it is 2V or not, ohhh it is giving 2.018V(measured with fluke based DVM). i don't know where is the problem. i think code wise no issue, even in amplifier is also working good and all grounds are connected to the same ground. could anyone give me the solution? excuse me for bad English.
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