AD536AKD

Overview

The AD536AKD is a monolithic integrated circuit performing true RMS-to-DC conversion. It directly computes the RMS value of complex waveforms with AC and DC components, achieving 1% error at crest factors up to 7. The device offers a bandwidth of 450 kHz for signals above 100 mV and 2 MHz for signals above 1 V. It features laser trimming for high accuracy with a maximum reading error of ±0.2%. The IC supports single or dual supply operation within a 5 V to 36 V range, drawing only 1.2 mA of quiescent current.

Feature Summary

• Performs true RMS-to-DC conversion on complex input waveforms containing both AC and DC components
• Includes crest factor compensation scheme allowing accurate measurements at high peak ratios
• Features laser-trimmed internal calibration ensuring high precision without external adjustments
• Provides logarithmic dB output capability for wide dynamic range signal analysis

Applications

• Precision power measurement in industrial instrumentation
• Audio level metering and signal analysis
• Vibration monitoring systems using accelerometer outputs
• Battery-powered test equipment requiring low static current

Procurement Notes

Verify the specific suffix designation when ordering, as it determines the temperature range and accuracy class. The AD536AKD typically denotes the commercial grade variant with specified operating limits. Confirm package availability and lead times through authorized distributors, as this component may be subject to limited production runs or obsolescence notices from Analog Devices.

Selection Notes

Select the AD536AKD when high accuracy is required for signals with varying crest factors. Ensure the input signal amplitude exceeds 100 mV to utilize the full 450 kHz bandwidth. Consider the AD536AS variant if operation in extreme temperatures below -55°C or above 125°C is necessary. Verify that the system power supply falls within the 5 V to 36 V operational window.

Part Context

This component belongs to the AD536A family of RMS-to-DC converters manufactured by Analog Devices. It serves as an enhanced successor to the original AD536, offering improved bandwidth and temperature stability. The device integrates rectification, squaring, averaging, and square-root functions into a single chip, replacing discrete hybrid solutions.

Replacement Considerations

The AD536AKD can be functionally replaced by the AD536AJDZ for applications tolerating higher error margins. For lower-level signal processing, the AD636 series is an alternative. Direct substitution requires verifying pin compatibility and thermal specifications.