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AD7986 - Data Reading

Question asked by Dileep_Raghu on May 31, 2018
Latest reply on Jun 18, 2018 by Gnib

Hi,

 

I have interface AD7986 with FPGA. With Internal reference and Turbo mode, I am reading data in CS MODE, 4-WIRE WITHOUT BUSY INDICATOR.

 

Clock – 25MHz

Conversion time used is 600ns

Data reading during acquisition.

  

Below are digital output code got for respective voltage

 

4 volt     - 0x1F90E

3 volt     - 0x178A9

2 volt     - 0xE94A

1.5 volt - 0x7145

1 volt     - 0x0148

0.5 volt - 0x3EF15

 

What may be the reason for this observed voltage drop.

 

Please find attached schematics.

 

Thanks and Regards,

Dileep

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