FEATURES
Computes True rms value Average rectified value Absolute value Provides 200 mV full-scale input range (larger inputs with input scaling) Direct interfacing with 3½ digit CMOS analog-to-digital converters (ADCs) High input impedance: 1012 Ω Low input bias current: 25 pA maximum High accuracy: ±0.2 mV ± 0.3% of reading RMS conversion with signal crest factors up to 5 Wide power supply range: ±2.5 V to ±16.5 V Low power: 25 μA (typical) standby current No external trims needed for specified accuracy Furthermore, it maintains high accuracy while measuring a wide range of input waveforms, including variable duty cycle pulses and triac (phase) controlled sine waves. Compared to these circuits, the AD737 offers higher accuracy at equal or lower cost. The AD737 computes the rms value of both ac and dc input voltages, and is ac-coupled by adding an input capacitor. In this mode, the AD737 resolves input signal levels of 100 μV rms or less, despite variations in temperature or supply voltage.
Analog Devices
