AD636KD

Overview

The AD636KD is a low-power monolithic true RMS-to-DC converter designed for accurate measurement of complex AC and DC signals. It features a 200 mV full-scale input range with laser-trimmed accuracy, ensuring less than 0.5% maximum error even at signal crest factors up to 6. The device operates on single or dual supplies with a quiescent current of 800 μA, making it suitable for battery-powered applications. It includes an auxiliary dB output and integrated buffer amplifiers.

Feature Summary

• Performs true RMS-to-DC conversion on low-level signals
• Laser-trimmed for high accuracy with minimal external adjustment
• Includes auxiliary logarithmic dB output for level monitoring
• Features integrated input and output buffer amplifiers

Applications

• True RMS digital voltmeters
• Audio level meters
• Power measurement systems
• Portable test instruments

Procurement Notes

Verify the specific suffix 'KD' against official Analog Devices documentation to confirm package type and temperature grade. Ensure compatibility with required supply voltages and input signal ranges before integration. Cross-reference datasheet revisions for any updates to electrical characteristics or pin configurations.

Selection Notes

Select this component when high accuracy is required for signals with high crest factors. It is ideal for applications needing direct RMS computation without external multipliers. Consider the 200 mV full-scale limit and the need for an external averaging capacitor for optimal performance.

Part Context

The AD636 series provides a cost-effective alternative to hybrid RMS converters. The AD636KD variant specifically offers enhanced accuracy compared to standard versions. It is part of Analog Devices' portfolio of precision analog signal processing components.

Replacement Considerations

The AD737 is a similar low-cost RMS-to-DC converter but may have different accuracy specifications. Verify if the AD636JDZ meets requirements if the KD variant is unavailable, noting potential differences in error margins.