GENERAL DESCRIPTION

The AD636 is a low power monolithic IC that performs true rms-to-dc conversion on low level signals. It offers performance that is comparable or superior to that of hybrid and modular converters costing much more. The AD636 is specified for a signal range of 0 mV to 200 mV rms. Crest factors up to 6 can be accommodated with less than 0.5 additional error, allowing accurate measurement of complex input waveforms.

FEATURES

True rms-to-dc conversion

200 mV full scale

Laser-trimmed to high accuracy

0.5 maximum error (AD636K)

1.0 maximum error (AD636J)

Wide response capability

Computes rms of ac and dc signals

1 MHz, −3 dB bandwidth: V rms > 100 mV

Signal crest factor of 6 for 0.5 error

dB output with 50 dB range

Low power: 800 μA quiescent current

Single or dual supply operation

Monolithic integrated circuit

Low cost