AD737JR

Overview

The AD737JR is a low power, precision, monolithic true RMS-to-DC converter manufactured by Analog Devices Inc. It computes the true RMS value of an input signal with high accuracy across various waveforms. The device features a wide power supply range from ±2.5 V to ±16.5 V and operates within a temperature range of -40°C to +85°C. It offers a maximum error of ±0.2 mV ± 0.3% of reading for sine wave inputs and supports crest factors up to 5. The component utilizes an SOIC-8 surface mount package.

Feature Summary

• Computes true RMS values for variable duty cycle pulses and phase-controlled sine waves
• Provides direct interfacing capability with 3½ digit CMOS ADCs
• Maintains specified accuracy without requiring external trims

Applications

• Upgrading performance of non-RMS precision rectifiers
• Signal processing in measurement systems
• Power monitoring applications

Procurement Notes

Verify the specific suffix against official documentation to confirm pinout compatibility and electrical tolerances. Confirm RoHS compliance status and manufacturing origin through authorized channels. Ensure the source provides valid traceability data for quality assurance purposes before finalizing procurement decisions.

Selection Notes

Select this component when precise RMS conversion is required for complex waveforms including triac-controlled signals. Consider the ±2.5 V to ±16.5 V supply range and SOIC-8 packaging constraints. Evaluate the need for negative-going output polarity relative to system design requirements.

Part Context

The AD737 series represents a family of true RMS-to-DC converters designed for cost-effective precision measurements. The AD737 variant specifically provides a negative-going output, distinguishing it from the positive-output AD736 model. Both share identical internal architecture and performance characteristics.

Replacement Considerations

The AD736 serves as a functional substitute with identical specifications but provides a positive-going output instead of negative.