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AD7888 spike problem


I have a problem using AD7888 with ATmega324PA.

I am measuring sine voltages f=50Hz, so T= 20ms on 6 channels, 7 and 8 AIN are connected to GND

SPI frequency is 125kHz and SPI mode is 3.

What happens is that from time to time I get one spike in measurements.

I preform 72 measurements to cover time frame of T=20 ms. I'm interested in max. values and e.g. on 1st channel I have max of 600 and one spike happens with value 1500 and this spike is not present in signal which I measure.

What could you suggest me to do?

Thank you in advance !

Kind regards,

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