AD537SH

Overview

The AD537SH is a monolithic voltage-to-frequency converter manufactured by Analog Devices Inc. in a hermetic metal can package (H-10A). It operates from a single supply of 4.5 V to 36 V or dual supplies of ±5 V to ±18 V, consuming 1.2 mA quiescent current. The device supports a frequency range up to 150 kHz with nonlinearity as low as 0.07% max at 10 kHz full scale and 0.1% max at 100 kHz. It features a high input impedance amplifier, an internal 1.00 V reference, and a 1.00 mV/K absolute temperature output. Rated for performance between -55°C and +125°C.

Feature Summary

• High linearity with minimal deviation across the dynamic range
• Integrated precision oscillator system requiring only external RC components
• Versatile input amplifier supporting positive, negative, and current modes
• Internal reference outputs for voltage and absolute temperature

Applications

• Temperature-to-frequency conversion using the 1 mV/K output
• Phase-locked loop circuits for frequency-to-voltage conversion
• Two-wire data transmission systems
• Thermocouple interface linearization

Procurement Notes

Verify that the specific ordering suffix matches the required military or extended temperature grade. Confirm package type compatibility with existing board layouts. Check datasheet revisions for any specification updates. Ensure supply voltage ranges align with system requirements. Validate pinout configurations against schematic designs.

Selection Notes

Select this component when high linearity and wide dynamic range are critical. Consider the hermetic metal can package for harsh environments. Evaluate power consumption against battery life requirements. Assess thermal management needs for the specified operating temperature range. Verify interface logic levels match downstream digital circuits.

Part Context

This part belongs to the AD537 family of voltage-to-frequency converters. It shares core architecture with ceramic DIP variants but utilizes a hermetic metal can package. The 'S' suffix denotes the extended temperature rating suitable for demanding applications. It serves as a complete solution for analog-to-digital conversion tasks.

Replacement Considerations

Direct substitutes include other AD537 variants with different packages or temperature grades. Verify pinout compatibility before swapping. Check if alternative packages meet environmental sealing requirements. Ensure electrical specifications remain within acceptable limits for the application.