AD736AQ

The AD736AQ from Analog Devices is a low power, precision, monolithic true RMS-to-DC converter. It is designed to convert an AC voltage waveform to a DC voltage, providing the true RMS, average rectified, or absolute value. This device boasts high accuracy, with a maximum error of ±0.3 mV ± 0.3% of reading for sine wave inputs.

Key features include a 200 mV rms full-scale input range, which can be extended with an input attenuator. It operates with a wide power supply range from +2.8 V and -3.2 V up to ±16.5 V, consuming a low maximum supply current of 200 µA, making it suitable for battery-powered applications. The high input impedance of 10¹² Ω and low input bias current of 25 pA maximum ensure minimal loading on the signal source.

The AD736AQ maintains high accuracy for various input waveforms, including variable duty-cycle pulses and triac-controlled sine waves. It can measure signals with crest factors up to 5 at the 200 mV full-scale input level with only a 2.5% additional error. The converter features a buffered voltage output and requires no external trims for specified accuracy.

Packaged in an 8-CERDIP, the AD736AQ is suitable for through-hole mounting. Its low cost and small size make it an effective upgrade for non-RMS precision rectifiers, offering higher accuracy at a comparable or lower cost.