AD737ANZ

Overview

The AD737ANZ is a low power, precision, monolithic true RMS-to-DC converter manufactured by Analog Devices Inc. It operates within an input voltage range of 2.8 V to 16.5 V and consumes a typical working supply current of 160 uA. The device provides high accuracy with a maximum error of ±0.2 mV ± 0.3% of reading for sine wave inputs. It features a wide power supply range from ±2.5 V to ±16.5 V and supports signal crest factors up to 5. The component is housed in an 8-pin PDIP package and functions as a specialized PMIC.

Feature Summary

• Computes true RMS value directly using signal squaring and integration techniques rather than rectification and averaging.
• Provides direct interfacing capability with 3½ digit CMOS ADCs due to its output characteristics.
• Maintains high accuracy across various input waveforms, including variable duty cycle pulses and triac-controlled sine waves.

Applications

• Upgrading the performance of non-RMS precision rectifiers in measurement instruments.
• Signal processing circuits requiring accurate RMS conversion for complex waveforms.
• Development and testing environments utilizing the AD737-EVALZ evaluation board.

Procurement Notes

Verify availability status carefully as distribution channels may indicate limited supply or discontinuation. Confirm RoHS compliance details through official documentation before integration. Ensure the specific PDIP-8 package variant matches the design requirements. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components. Validate that the operating temperature range meets the environmental specifications of the target application.

Selection Notes

Select this component when precise RMS conversion is required for diverse signal types including pulsed and phase-controlled waveforms. Consider the low power consumption and small physical size for space-constrained designs. Compare against standard precision rectifier solutions where higher accuracy at equal or lower cost is necessary. Ensure the input scaling requirements align with the 200 mV full-scale input range specification.

Part Context

The AD737 belongs to the AD737 series of true RMS-to-DC converters produced by Analog Devices. It is functionally related to the AD736, which offers a positive-going output version of the same basic device architecture. The AD737-EVALZ serves as the dedicated evaluation tool for assessing the performance of this converter family in practical circuit implementations.

Replacement Considerations

The AD736 is documented as the positive-output counterpart to the AD737. Verify pin compatibility and output polarity differences if substituting between these devices. No other public substitute part numbers are confirmed in the provided data.