AD537KH

Overview

The AD537KH is a monolithic voltage-to-frequency converter housed in a hermetic metal can package. It integrates an input amplifier, precision oscillator, internal reference generator, and high-current output stage. The device supports single or dual supply operation from 4.5 V to 36 V with a quiescent current of 1.2 mA. It features a frequency range up to 150 kHz and linearity error as low as ±0.07% at 10 kHz full scale. The rated performance temperature range is –55°C to +125°C.

Feature Summary

• Hermetically sealed metal can construction for rugged environments
• Integrated absolute temperature reference output tracking at 1 mV/K
• High input impedance buffer amplifier for nonloading signal interfacing
• Open-collector output stage capable of driving multiple logic families

Applications

• Absolute temperature-to-frequency conversion systems
• Phase-locked loop frequency-to-voltage converters
• Two-wire data transmission links
• Thermocouple interface circuits with linearization

Procurement Notes

Verify the specific suffix KH indicates the hermetic metal can package variant. Confirm that the military-grade temperature rating aligns with system requirements. Check datasheet notes regarding pinout differences between ceramic DIP and metal can packages. Ensure supply decoupling meets recommended practices for low jitter applications.

Selection Notes

Select this component when hermetic sealing is required for harsh environments. The metal can package lacks external SYNC pins compared to ceramic versions. Verify that the –55°C to +125°C operating range suits the application. Consider the open-collector output flexibility for various logic levels.

Part Context

The AD537 series includes ceramic DIP and hermetic metal can variants. The KH suffix denotes the metal can version with extended temperature capabilities. This family provides high linearity and low power consumption for precision analog-to-digital conversion tasks.

Replacement Considerations

AD537JH and AD537SH are compatible hermetic metal can alternatives within the same series.