AD536ASD

Overview

The AD536ASD is a monolithic true RMS-to-DC converter integrated circuit manufactured by Analog Devices. It directly calculates the RMS value of input waveforms, including AC and DC components, with a maximum reading error of ±5mV plus 0.5%. The device features a peak factor compensation table allowing measurements up to a peak factor of 7 with only 1% error. It supports a bandwidth of 450 kHz for signals greater than 100 mVrms and 2 MHz for signals greater than 1 Vrms. The component operates within a temperature range of -55°C to +125°C and requires a supply voltage between 5V and 36V.

Feature Summary

• Direct calculation of true RMS values for complex AC and DC signals without external adjustment
• Integrated peak factor compensation table enabling accurate measurement of wide dynamic range signals
• Logarithmic dB output capability with a 60 dB range for direct signal level conversion
• Complete input and output protection against overvoltage and short circuits

Applications

• Precision power measurement in industrial instrumentation
• Audio signal analysis and monitoring systems
• Battery-operated meters requiring low static current consumption
• Communication equipment signal strength detection

Procurement Notes

Verify the specific suffix designation to confirm the package type and temperature grade, as the AD536A series includes multiple variants such as AJ, AK, and AS with distinct performance tolerances and operating ranges. Confirm availability status through authorized distributors, as this component may be subject to limited supply or special order requirements depending on current production cycles.

Selection Notes

Select the AD536ASD when operation in extreme environments below 0°C is required, given its extended temperature range compared to commercial grades. Ensure the application involves signals exceeding 100 mVrms to utilize the full 450 kHz bandwidth specification. Consider the 1.2 mA static current consumption for battery-powered designs and verify that the required peak factor does not exceed the compensated limit of 7 for optimal accuracy.

Part Context

The AD536A series represents an evolution from the earlier AD536, offering improved bandwidth and reduced temperature drift. It serves as a complete replacement for hybrid or discrete RMS-to-DC solutions, integrating rectification, squaring, averaging, and square-root functions into a single laser-trimmed die. This integration eliminates the need for external matching components typically required in older architectures.

Replacement Considerations

• AD536AJHZ
• AD536ASH

FAQ

How does the AD536ASD handle high peak factor signals?

The device includes an internal peak factor compensation table that allows for accurate measurement of signals with peak factors up to 7, maintaining an error margin of only 1%.

What is the minimum input signal level for specified accuracy?

The device maintains specified accuracy for input signals greater than 100 mVrms within its 450 kHz bandwidth specification.