Analog Devices Inc. AD637SD/883B

Description
The AD637 is a high-precision, wideband RMS-to-DC converter that computes the true RMS value of complex waveforms. It offers exceptional accuracy with a maximum nonlinearity of 0.02% for inputs ranging from 0 V to 2 V RMS. The AD637 also features a crest factor compensation scheme that allows for measurements of signals with crest factors up to 10 with less than 1% additional error.
The AD637 has a wide bandwidth, capable of measuring signals up to 8 MHz at 2 V RMS input and 600 kHz at 100 mV RMS. It can compute true RMS, square, mean square, or absolute value, and provides an auxiliary dB output with a 60 dB range.

Features
High accuracy: 0.02% maximum nonlinearity, 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, and dB output
Chip select/power-down feature allows analog three-state operation and quiescent current reduction from 2.2 mA to 350 μA
Available in 14-lead SBDIP, 14-lead CERDIP, and 16-lead SOIC W packages

Applications
Precision RMS measurement
Power measurement
Audio level measurement
Vibration analysis
Medical instrumentation
Industrial control