AD637AQ

Overview

The AD637AQ is a high-precision monolithic RMS-to-DC converter manufactured by Analog Devices Inc. It calculates the true root-mean-square value of complex AC or AC-plus-DC waveforms, providing an equivalent DC output voltage. The device features a wide bandwidth of up to 8 MHz for input levels above 1 Vrms and 600 kHz for lower levels. It supports a maximum input voltage of 7 Vrms and operates within a supply voltage range of ±3 V to ±18 V. The component is housed in a 14-pin ceramic dual in-line package (CDIP) suitable for through-hole mounting.

Feature Summary

• Computes true RMS values for any complex waveform with high precision
• Includes peak factor compensation for signals with factors up to 10
• Features chip select functionality to reduce power consumption during idle periods
• Provides auxiliary dB output for direct logarithmic signal measurement

Applications

• Precision power measurement systems
• Industrial process control instrumentation
• Handheld testing equipment requiring low power
• Audio and RF signal analysis

Procurement Notes

Verify the specific suffix AQ indicates industrial temperature grade compliance (-40°C to +85°C). Confirm the package type matches the required CDIP footprint. Ensure supply chain sources provide original manufacturer documentation to validate authenticity. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this component when accurate RMS conversion of non-sinusoidal signals is required. Consider the 8 MHz bandwidth for high-frequency applications. Evaluate the need for the auxiliary dB output feature. Compare against other converters if extreme dynamic range or different packaging options are necessary for the specific design constraints.

Part Context

The AD637 series represents a class of high-performance analog signal processing integrated circuits designed for accurate energy measurement. It distinguishes itself from average-responding converters by handling complex waveforms without distortion. The AD637AQ variant specifically targets industrial environments requiring extended temperature stability and robust performance characteristics.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.