AD737JRZ-5-RL

Overview

The AD737JRZ-5-RL is a low power, precision, monolithic true RMS-to-DC converter manufactured by Analog Devices Inc. It is laser trimmed to provide a maximum error of ±0.2 mV ± 0.3% of reading with sine wave inputs. The device maintains high accuracy while measuring a wide range of input waveforms, including variable duty cycle pulses and triac controlled sine waves. It features a 200 mV full-scale input range, direct interfacing with 3½ digit CMOS ADCs, and a high input impedance of 10^12 Ω. The component operates on a wide power supply range from ±2.5 V to ±16.5 V with a typical standby current of 25 µA.

Feature Summary

• Computes true RMS value for accurate signal measurement across various waveform types
• Provides direct interfacing capability with 3½ digit CMOS ADCs without external scaling
• Maintains high accuracy with no external trims needed for specified performance

Applications

• Upgrading the performance of non-RMS precision rectifiers in measurement systems
• Measuring variable duty cycle pulses and triac phase controlled sine waves
• Direct interface applications with digital display systems using CMOS ADCs

Procurement Notes

Verify the specific suffix designation against official Analog Devices documentation to confirm pinout and electrical characteristics match the required design specifications. Ensure the package type corresponds to the intended PCB layout. Confirm RoHS compliance status and moisture sensitivity level prior to procurement to meet manufacturing standards.

Selection Notes

Select this component when precise RMS conversion is required for complex waveforms such as pulses or phase-controlled signals. It is suitable for applications demanding high input impedance and low bias current. Consider the negative-going output characteristic and ensure compatibility with downstream circuitry that accepts inverted voltage levels.

Part Context

The AD737 series represents a family of low-cost, low-power true RMS-to-DC converters designed to replace traditional precision rectifier circuits. The JRZ variant indicates a specific surface-mount package configuration. This device offers superior accuracy compared to standard rectifier solutions at equal or lower cost, making it a standard choice for analog signal processing tasks requiring effective value computation.

Replacement Considerations

The AD736 is the positive output-going version of the same basic device architecture. Verify if the system can accommodate the polarity difference between the AD737's negative output and alternative components.