AD8318 output measurement problem

Hi guys, my first post here. I have AD8318 RF logarithmic detector module. inside datasheet it says output is DC from 0.2 volts to around 2.1 volts so it must be so easy to measuring output and understand RF power level but when I measuring output voltage it's very constant above 2 or 3 volts and changes are very little a few millivolts. I connect it to the arduino's analog input for detecting voltage level but as I said before voltage is more DC like and it doesn't change, after filtering output DC voltage it can detect AC pulses but still not accurate and noisy.

so what I understand wrong about this IC?

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