I'm trying to use AD650 as a frequency to voltage converter.
Fin max = 1MHz, Voltage =0-10V.
From the calculator on the website I obtained Rin=11,11KOhm, Cint= 1.44e-5, Cos=8.824e-11. So I applied Rin=11,5kOhm, Cint=82pF, Cos=15uF.
The problem is, that during measurements, the output voltage changes in weird way, by what I mean:
Does anybody have an idea what's going on? And why the results are so weird? Is this satndard behaviour? Hope not...
1. Why there is a voltage jump up to the max voltage output reserved for max frequency?
2. Why the voltage is stable between 300kHz and 100kHz?
3. Why the voltage rises in 90kHz, when it should decrease?
I really need somebody's help