AD636 with 0-230 VAC Input

Hi,

I'm building a voltage measurement device for measuring 0-230 VAC input for a light dimmer. I just learnt about Analog Devices AD536 and AD636 ICs. I have the following doubts:

1. I want millivolt precision for detecting voltages; can you provide me with a application note or circuit diagram for converting 0-300VAC to 0-5VDC (I want true rms converter, as waveform is not pure sine).

2. How to 0-230VAC input range be extended to higher range; what modifications are required in the circuit?

Regards,

Ajay.