DESCRIPTION

· The AD737 is a low power, precision, monolithic, true rms-to-dc converter.

· It is laser trimmed for maximum error of ±0.2 mV ± 0.3% of reading with sine wave inputs.

· It maintains high accuracy for a wide range of input waveforms.

· The AD737 computes the rms value of both ac and dc input voltages.

· It is optimized for use in portable multimeters and other battery-powered applications.

FEATURES

· Computes True rms value, Average rectified value, Absolute value.

· Provides 200 mV full-scale input range.

· Direct interfacing with 3½ digit CMOS analog-to-digital converters (ADCs).

· High input impedance: 10^12 Ω, Low input bias current: 25 pA maximum.

· High accuracy: ±0.2 mV ± 0.3% of reading.

· Wide power supply range: ±2.5 V to ±16.5 V, Low power: 25 μA (typical) standby current.

APPLICATIONS

· Upgrading the performance of non-rms precision rectifiers.

· Portable multimeters and other battery-powered applications.

· High accuracy measurement of input waveforms with crest factors of 1 to 3.