Suggestion in interfacing CT to microcontroller
Some remarks:


when 47 Ohm is recommended, why choose 200 Ohm??
IIRC the recommended maximum source impedance for the A/D is 2.5k, the DC impedance of your devider is 5k. If power is not a problem I would take two 1k resistors.
that direct line from the trafo to the A/D input pin makes me nervous. I would add a series resistor (1k) and two (schottky) diodes for protection, and maybe a capacitor too.


For an explanation of resistor-diode-diode for input protection read what-kind-of-diode-to-use-with-adc-inputs.