ADC false readings

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hello, i'm working on project feed voltage a0 using op295 op amp. op amp give me steady voltage of lets 1.30v, counts should @ 266, adc read +-20-30 counts off, 220 or 290, , read different @ given time. using default reference voltage , seems steady during duration of analogread. when try feed a0 pin external power supply @ 1.30 volts, counts should be. can't seem figure out problem here. have placed traditional .1uf caps vcc gnd, , a0 gnd. never seem able achieve value should at. appreciated. thanks.

hello, i'm working on project feed voltage a0 using op295 op amp. op amp give me steady voltage of lets 1.30v, counts should @ 266, adc read +-20-30 counts off, 220 or 290, , read different @ given time. using default reference voltage , seems steady during duration of analogread. when try feed a0 pin external power supply @ 1.30 volts, counts should be. can't seem figure out problem here. have placed traditional .1uf caps vcc gnd, , a0 gnd. never seem able achieve value should at. appreciated. thanks.


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