AD737KRZ-R7

Overview

The AD737KRZ-R7 is a low power, precision, monolithic true RMS-to-DC converter manufactured by Analog Devices Inc. It operates within a wide supply voltage range of ±2.5 V to ±16.5 V and features a maximum input bias current of 25 pA with high input impedance of 10^12 Ω. The device provides an output accuracy of ±0.2 mV ± 0.3% of reading for sine wave inputs and supports signal crest factors up to 5. Packaged in an 8-SOIC surface-mount format, it delivers a negative-going output suitable for direct interfacing with ADCs.

Feature Summary

• Computes true RMS values for various input waveforms including variable duty cycle pulses
• Provides absolute value computation with a 200 mV full-scale input range
• Features high input impedance and low input bias current for minimal circuit loading

Applications

• Upgrading performance of non-RMS precision rectifiers
• Direct interfacing with 3½ digit CMOS ADCs
• Measurement of triac phase-controlled sine waves

Procurement Notes

Verify the specific suffix 'R7' against official Analog Devices documentation to confirm reel packaging specifications and tape-and-reel dimensions. Ensure the operating temperature range and RoHS compliance status match project requirements before finalizing procurement plans.

Selection Notes

Select this component when precise RMS conversion is required for complex waveforms beyond simple sine waves. Consider the negative-going output polarity and ensure compatibility with downstream circuitry. Evaluate the low standby current and lack of external trim requirements for cost-sensitive designs.

Part Context

This part belongs to the AD737 family of true RMS-to-DC converters. It shares core functionality with the AD736 but differs in output polarity, providing a negative-going signal instead of positive. The KRZ variant indicates a specific industrial or commercial grade package configuration within the broader product line.

Replacement Considerations

The AD736 serves as a functional substitute if a positive-going output is acceptable. Verify pinout compatibility and output polarity differences before swapping components in existing designs.