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LDC1101: Rp setting calculation

Part Number: LDC1101

Hi , I'm Hyeon Yeong

example)

Rp of my sensor is 3.51kOhm and so I'm coded to 3KOhm(RPMIN SETTING,sensor drive: 150uA)

and then 

I calculated wiht this 

Rp=pi*Vamp/4/I_DRIVE

I got a Vamp that is 0.668V

but when I check the sensor signal Vamp is 0.3V

why are they different?