GENERAL DESCRIPTION

The AD536A is a complete monolithic integrated circuit that performs true rms-to-dc conversion. It offers performance comparable or superior to that of hybrid or modular units costing much more. The AD536A directly computes the true rms value of any complex input waveform containing ac and dc components.

A crest factor compensation scheme allows measurements with 1% error at crest factors up to 7. The wide bandwidth of the device extends the measurement capability to 300 kHz with less than 3 dB errors for signal levels greater than 100 m V.

FEATURES

True rms-to-dc conversion

Laser trimmed to high accuracy

  ±0.2% maximum error (AD536AK)

  ±0.5% maximum error (AD536AJ)

Wide response capability

  Computes rms of ac and dc signals

  450 kHz bandwidth: V rms > 100 mV

  2 MHz bandwidth: V rms > 1 V

  Signal crest factor of 7 for 1% error

dB output with 60 dB range

Low power: 1.2 mA quiescent current

Single- or dual-supply operation

Monolithic integrated circuit

−55°C to +125°C operation (AD536AS)