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AD9230 output unexpected result

Question asked by enrich_you on Jul 22, 2015
Latest reply on Jul 23, 2015 by David.Buchanan


   I am using the high speed ADC of AD9230 for DPD feedback channel.

  The sample rate was 120MSPS, analog input common mode voltage was 1.46V; and Rbias pin was 0.5V; SDR mode, two complement output.

  In order to verify the ADC's noise floor,  I tied VIN+ and VIN- together ,and I found the output bit5 to bit 11 was not correct. It seems VIN+ - VIN- >0.

  When I use the test mode , the digital output was correct, so the digital transmission was ok.  

   Thank you.