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AD536AJD - Integrated Circuit True RMS-to-DC Converter - Analog Devices

FEATURES

True RMS-to-DC Conversion

Laser-Trimmed to High Accuracy

0.2% Max Error (AD536AK)

0.5% Max 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)

PRODUCT OVERVIEW

The AD536A is a complete monolithic integrated circuit which

performs true rms-to-dc conversion. It offers performance which

is 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. It has a crest factor compensation scheme which

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 3 dB error for signal levels above 100 mV.

An important feature of the AD536A not previously available in

rms converters is an auxiliary dB output. The logarithm of the

rms output signal is brought out to a separate pin to allow the

dB conversion, with a useful dynamic range of 60 dB. Using an

externally supplied reference current, the 0 dB level can be conveniently

set by the user to correspond to any input level from

0.1 to 2 volts rms.

The AD536A is laser trimmed at the wafer level for input and

output offset, positive and negative waveform symmetry (dc reversal

error), and full-scale accuracy at 7 V rms. As a result, no

external trims are required to achieve the rated unit accuracy.

There is full protection for both inputs and outputs. The input

circuitry can take overload voltages well beyond the supply levels.

Loss of supply voltage with inputs connected will not cause

unit failure. The output is short-circuit protected.

The AD536A is available in two accuracy grades (J, K) for commercial

temperature range (0°C to +70°C) applications, and one

grade (S) rated for the 55°C to +125°C extended range. The

AD536AK offers a maximum total error of ±2 mV ±0.2% of

reading, and the AD536AJ and AD536AS have maximum errors

of ±5 mV ±0.5% of reading. All three versions are available in

either a hermetically sealed 14-lead DIP or 10-pin TO-100

metal can. The AD536AS is also available in a 20-leadless hermetically

sealed ceramic chip carrier.