AD736AQ

Overview

The AD736AQ is a low-power, precision monolithic true RMS-to-DC converter manufactured by Analog Devices. It converts AC voltage waveforms into DC voltages representing the true RMS, average rectified, or absolute value. The device features a 200 mV RMS full-scale input range and maintains high accuracy across various waveforms, including variable duty-cycle pulses. It operates on a wide power supply range from +2.8 V to ±16.5 V with a maximum supply current of 200 µA. Laser trimming ensures a maximum error of ±0.3 mV plus 0.3% of reading for sine wave inputs.

Feature Summary

• Converts AC voltage waveforms to DC voltage representing true RMS, average rectified, or absolute values
• High input impedance of 10^12 Ω with low input bias current of 25 pA maximum
• Laser trimmed for high accuracy with specified performance without external trims
• Capable of RMS conversion for signals with crest factors up to 5

Applications

• Upgrading non-RMS precision rectifiers in measurement instruments
• Precision measurement of variable duty-cycle pulse waveforms
• Measurement of triac phase-controlled sine waves

Procurement Notes

Verify the specific suffix AQ against the official Analog Devices datasheet to confirm package type and temperature grade. Ensure the ordering part number matches the required pin configuration and electrical specifications. Cross-reference with the manufacturer's latest documentation to validate compliance and revision status before procurement.

Selection Notes

Select the AD736AQ when high accuracy is required for non-sinusoidal waveforms without external calibration. Consider its 200 µA power consumption for battery-operated applications. Compare with the AD737 if negative output polarity or power-down functionality is needed instead of the positive buffered output provided by this model.

Part Context

The AD736 series represents a class of precision analog signal processing components designed for accurate AC voltage measurement. Unlike traditional averaging converters, these devices utilize internal squaring and integration techniques to determine true RMS values directly. This technology allows for precise measurements regardless of waveform distortion, making them essential in scientific and industrial instrumentation contexts.

Replacement Considerations

The AD737 is a related device featuring a negative DC output and power-down control. Verify interface compatibility and output polarity requirements when substituting. No other direct pin-compatible replacements are documented in the provided source material.