AD637SD

Overview

The AD637SD is a high-precision, wideband RMS-to-DC converter manufactured by Analog Devices Inc. It computes true RMS, square, mean square, absolute value, and dB output for complex waveforms. The device features a chip select/power-down capability that enables analog three-state operation and reduces quiescent current from 2.2 mA to 350 μA. It offers maximum nonlinearity of 0.02% for inputs between 0 V and 2 V rms, with an additional error of 0.1% up to a crest factor of 3. The bandwidth reaches 8 MHz at 2 V rms input and 600 kHz at 100 mV rms input.

Feature Summary

• Computes true RMS, square, mean square, absolute value, and dB output
• Features chip select/power-down for analog three-state operation
• Provides high accuracy with low nonlinearity across wide bandwidth

Applications

• Complex waveform analysis
• Audio and vibration measurement
• Power monitoring systems

Procurement Notes

Verify the specific suffix 'SD' against official Analog Devices documentation to confirm package type and temperature range. Ensure compatibility with required supply voltages and input signal ranges before integration. Cross-reference datasheet revisions to confirm pinout and electrical specifications match design requirements.

Selection Notes

Select this component when high precision and wide bandwidth are required for RMS-to-DC conversion. Consider the power-down feature if system efficiency is critical. Evaluate the input signal amplitude against the specified nonlinearity limits to ensure accurate measurements within the desired dynamic range.

Part Context

The AD637 series includes variants such as AD637JDZ, AD637ARZ, and AD637AQ, offering different packages like DIP, SOIC, and CDIP. These devices share core functionality but differ in physical form factors and operating temperature ranges. The AD637SD represents a specific configuration within this family designed for specialized mounting or environmental needs.

Replacement Considerations

Public confirmed substitute part numbers: None.