LTC1967 RMS-DC Converter transformer issue

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What voltage range from what source?

If it's from AC mains, you need a transformer for safety isolation, if anything else at all will be connected to the circuit.
 
Unfortunately AC mains and dimmed 10-60VAC. If we push isolation into the background, isn't there other way to do that?
 
If it's connected to other things, it must have isolation. If it's going to be a self-contained and fully insulated instrument, get it working using a low voltage AC source to start with then change the input scaling resistors to suit the final voltage range.

Isolation without a mains transformer can be done using isolation anps and a miniature DC-DC converter to run them.
eg

And something like this to power the input stage:

RFM-0505S | Recom RFM DC-DC Converter, 5V dc/ 200mA Output, 4.5 → 5.5 V dc Input, 1W, Through Hole, +85°C Max Temp -40°C Min | RS

uk.rs-online.com

There is an article here which includes measuring AC powerline voltages with ICs such as that:
 
Do you have any example circuit about it? Because mine is doesn't work.
By the way, the article PDF is high level. I don't know which circuit to use
 
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