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ADS7825 intenal operation_Again_

Other Parts Discussed in Thread: ADS7825

 

Hello

 

Please allow me I had changed  to the  new subject  about previous subject on below .

http://e2e.ti.com/support/data_converters/precision_data_converters/f/73/p/396501/1401646#1401646

***Background:

Our customer is using ADS7825 long time, but they found the analog input rises recently. 

Especially,  if input were open Or, input cap were very small (pF ) ,analog input is 1.79V

 

**Question

Here I had attached the odf file which include customer's schematic. test result depend on Mr Harsha's  advice .

And also, customer has 4 questions in the attached. pdf.

Would please advise withina few days?

I am sorry such a complicated question, but this is very relative to cutomer's mass production on Feb.

 

 

20150129 ADS7825_Input_voltage_rise_.pdf