U4: AD737J Low Power, Precision, Monolithic True Rms-to-dc Converter With 200 MV Full-scale Input Range. 2013-09-14 1711 × 1140 Unt-T U60e PCB / Case Pictures U4: AD737J Low Power, Precision, Monolithic True Rms-to-dc Converter With 200 MV Full-scale Input Range. U4: AD737J Low Power, Precision, Monolithic True Rms-to-dc Converter With 200 MV Full-scale Input Range.