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PRODUCT DESCRIPTION

The AD637 is a complete high accuracy monolithic rms-to-dc converter that computes the true rms value of any complex waveform. It offers performance that is unprecedented in integrated circuit rms-to-dc converters and comparable to discrete and modular techniques in accuracy, bandwidth and dynamic range. A crest factor compensation scheme in the AD637 permits measurements of signals with crest factors of up to 10 with less than 1 additional error. The circuit’s wide bandwidth permits the measurement of signals up to 600 kHz with inputs of 200 mV rms and up to 8 MHz when the input levels are above 1 V rms.

FEATURES

High Accuracy

0.02 Max Nonlinearity, 0 V to 2 V RMS Input

0.10 Additional Error to Crest Factor of 3

Wide Bandwidth

8 MHz at 2 V RMS Input

600 kHz at 100 mV RMS

Computes:

True RMS

Square

Mean Square

Absolute Value

dB Output (60 dB Range)

Chip Select-Power Down Feature Allows:

Analog “3-State” Operation

Quiescent Current Reduction from 2.2 mA to 350 μA

Side-Brazed DIP, Low Cost Cerdip and SOIC