AnsweredAssumed Answered

AD7176-2 gain and offset problem

Question asked by Paul0606 on Apr 16, 2013
Latest reply on Apr 30, 2013 by J.Gealon

Hi,

I am evaluating the AD7176-2 using a custom PCB with PIC24 microcontroller. I run into a strange problem that if 1Vpp and 2Vpp sinusoidal waves are applied to the input, the outputs variate from -800~900mV and -1400~1900mV.

 

I wonder if I did anything wrong to the hardware to get this error? The AVDD and AVSS are +2.35V and -2.35V respectively. The reference output is 2.5V with reference to AVSS. The source is generated from Agilent 33220A and is buffered before connecting to the inputs. Please advise some tips in order to perform troubleshooting.

 

Thank you ,

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