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AD7986 - Data Reading



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,


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