ANALOG DEVICES AD736: Low Cost Low Power True RMS-to-DC Converter Data Sheet (Rev H 2007-02-01-)
Datasheet
The AD736 is a low power, precision, monolithic true rms-to-dc converter. It is laser trimmed to provide a maximum error of ±0.3 mV ± 0.3% of reading with sine wave inputs. Furthermore, it maintains high accuracy while measuring signals with crest factors as high as 5.