HELP IC RMS TO DC

Hello friends.
I need an IC RMS TO DC CONVERTER with some features that I can not see clearly in the datasheets (AD637, AD536, AD637 for example).
. Input signal:
- Not more than 1 vrms
- Various waveforms
- Up to 1MHZ is more than enough
- Best possible accuracy. Example: 100mvrms = 100mvdc.
I'm counting on your help.