AD7986 - Data Reading

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

Parents
  • 0
    •  Analog Employees 
    on Aug 24, 2018 12:51 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
Reply
  • 0
    •  Analog Employees 
    on Aug 24, 2018 12:51 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
Children
No Data