AnsweredAssumed Answered

AD628 single supply offset issue

Question asked by wasim_28 on Dec 31, 2015
Latest reply on Jan 4, 2016 by ScottH

HI,

 

I am using AD628 for my current sensing application .Current range 0 to 2.5amps through the R76 (0.01 current sense resistor )  . the gain for first stage is 0.1 and second stage is sate as 3.12  , supply voltage for the AD628 is +5V and GND (single supply). while measuring the 1st stage output at C512 (by varying the current from 0amps to 2 amps) , I am always getting 0.715V and second stage 2.174V . whereas the expected voltage level should be as below .

 

  

Current(amps)Expected output @ 1st stage of AD628 .Expected output @ 2st stage of AD628.
0.50.05V0.156V
10.1V0.312V
1.50.15V0.468V
20.2V0.624V
2.50.25V0.78V

 

Kindly address the  same issue .

 

Regards ,

 

Wasim

Attachments

Outcomes