Fluctuation of temperature reading from AD595

Hi,

As seen from the photo I have attached, I get a fluctuation from the reading (pin8 and pin 9) from my ad595CQ. The dc value of the reading is correct, but I get this strange fluctuation around the correct value (16 - 20 mV peak to peak).  The frequency of the fluctuation is ~50Hz. I suppose that I get this noise from the mains. Whatever filter I tried (from those described by the datasheet) I get the same fluctuation.

1.Is this fluctuation normal?

2.Should I try another filter for my supply?

Thank you in advance.

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