AD736KN

Overview

The AD736KN is a low-power, precision monolithic true RMS-to-DC converter manufactured by Analog Devices Inc. It utilizes silicon gate CMOS technology and is housed in an 8-pin CERDIP package. The device converts AC voltage waveforms to DC values representing the true RMS, average rectified, or absolute value. It features a wide power supply range from +2.8 V/-3.2 V to ±16.5 V and maintains high accuracy with a maximum error of ±0.3 mV ± 0.3% of reading for sine wave inputs. The unit operates within a temperature range of -55°C to +125°C and draws a maximum supply current of 200 µA.

Feature Summary

• Laser-trimmed architecture ensures high measurement accuracy across various input waveforms including variable duty-cycle pulses and phase-controlled sine waves.
• High input impedance and low bias current minimize loading effects on signal sources during conversion processes.
• Integrated buffered voltage output provides design flexibility without requiring external trimming for specified performance levels.

Applications

• Portable battery-powered multimeters
• Industrial process control instrumentation
• Power monitoring systems

Procurement Notes

Verify the specific suffix KN indicates the military-grade ceramic DIP variant when sourcing. Confirm environmental compliance status and lot traceability requirements prior to order placement. Ensure compatibility with existing board layouts regarding the 8-pin CERDIP footprint. Validate that the operating temperature range meets the final application's thermal constraints.

Selection Notes

Select this component when high precision is required for non-sinusoidal signals in harsh environments. Compare against the AD737 if negative output polarity or power-down functionality is necessary. Consider the AD736JRZ or ARZ variants for commercial grade surface-mount applications where space is limited. Evaluate total system cost against the performance benefits over traditional precision rectifier circuits.

Part Context

The AD736 series represents a family of true RMS-to-DC converters designed for high-accuracy signal processing. The KN suffix typically denotes a hermetically sealed ceramic package suitable for extended temperature ranges and reliability-critical applications. This part serves as a direct upgrade path for legacy designs using discrete precision rectifiers.

Replacement Considerations

The AD736JN is a plastic DIP alternative with a lower temperature range. The AD736JRZ-R7 and AD736ARZ-R7 are surface-mount equivalents for commercial use. Verify pinout compatibility and thermal management requirements when substituting these variants.