DESCRIPTION

· The AD736 is a low power, precision, monolithic true rms-to-dc converter, laser trimmed for maximum error of ±0.3 mV ± 0.3% of reading with sine wave inputs.

· It maintains high accuracy with a wide range of input waveforms, including variable duty-cycle pulses and triac-controlled sine waves.

· Suitable for upgrading non-rms precision rectifiers, offering higher accuracy at equal or lower cost.

· Can compute the rms value of both ac and dc input voltages, and can be operated as an ac-coupled device with one external capacitor.

· Features an output buffer amplifier for design flexibility, optimized for portable multimeters and battery-powered applications.

FEATURES

· Converts ac voltage waveform to dc voltage, then to true rms, average rectified, or absolute value.

· 200 mV rms full-scale input range, expandable with input attenuator.

· High input impedance: 1012 Ω, low input bias current: 25 pA maximum.

· High accuracy: ±0.3 mV ± 0.3% of reading, RMS conversion with signal crest factors up to 5.

· Wide power supply range: +2.8 V, −3.2 V to ±16.5 V, low power: 200 µA maximum supply current.

· Buffered voltage output, no external trims needed for specified accuracy.

APPLICATIONS

· Upgrading the performance of non-rms precision rectifiers in various applications.

· Suitable for portable multimeters and other battery-powered applications due to low power consumption.

· High accuracy measurement of input waveforms with crest factors from 1 to 5.

· Applications requiring high input impedance or low impedance input for signal levels up to 300 mV rms.

· Industrial and commercial temperature range applications with available performance grades and low-cost packages.