Problem of AD7908.

Hi ,

I use the AD7908 and the current sensor IC "MAX4073T" without any OP between current sensor output and Vin of AD7908.

In some case, the output of current sensor will be 0.4V, but there is a 3.6V rising due to the reverse current of ADC.

I put an 1M ohm resistor between two IC's to reduce the reverse current temporarily.

Is there any possible error that may happen in my circuit?

Thanks a lot,
Stan