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AD7760 Driving Circuit

Question asked by vuquan91 on Jun 19, 2018
Latest reply on Jun 21, 2018 by vuquan91

As recommended by the AD7760 datasheet, I use the driving circuit shown as below.

The values of resistors and capacitors for differential amplifier configuration are as in Table 8.

For the AD8021, R = 50 Ohm. 

Then I use signal generator to generate and input sine wave to test the ADC. The result I received shows that the output data of the ADC always get shifted about 160000 over 0 level. 

Here are the result with sine wave input, 

and the result without signal (only noise),

Any ideas why this might be happening? Should I change something in the design?

Thank you.