Dear Josh,

I think you didnot get my problem.
I am connecting 1 vdc signal to I/P-1
i.e. pin 1 of the chip through buffer
(voltage follower)
The successive readings I am getting
in ADCDAT(ADCDATAH&ADCDATAL)register
are 0BFF,0C1D,0CO1,0BF8,0BF8,0BFF...
Thus difference between max & min.
readings of single channel is around 20h.
The same problem occurs with all other channels with more or less same result.
even with on chip temp. sensor.
I think the problem is noise related.
what do you think? Please let me know.
What I am having doubt about is the power supply &/or my pcb layout.
If you can give me some tips about your
power supply & PCB layout,
I will be obliged.

Thanks,

MAK.