AD844

I want to purchase AD 844 current feed back operational amplifier, I have done simulation of a circuit which involves AD 844. Now  I want to design that circuit but I am not sure How to feed current as an input in AD844.

AD844 require current as an input but I am not aware of a device which can give output as current so tell me from where I can get this current.

In my project I have to relate this current with frequency so I need an IC which can convert frequency to current but this current should be an AC current because the circuit which i am using (with AD844) cannot run on DC as it has some capacitor circuitry involved.

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