AD537JH

Overview

The AD537JH is a monolithic voltage-to-frequency converter housed in a hermetic TO-100 metal can package. It operates on single supplies from 4.5 V to 36 V or dual supplies of ±5 V to ±18 V, drawing 1.2 mA quiescent current. The device provides a frequency range up to 150 kHz with nonlinearity of 0.15% maximum at 10 kHz full scale and 0.25% maximum at 100 kHz full scale. It features a high input impedance amplifier (250 MΩ), a precision 1.00 V reference output, and an absolute temperature reference output of 1.00 mV/K.

Feature Summary

• Integrates a high-impedance input amplifier and precision oscillator for direct conversion of small signals without external conditioning.
• Provides symmetrical square wave output capable of driving digital logic families directly via open-collector interface.
• Includes internal bandgap reference generating stable 1.00 V and 1.00 mV/K outputs for calibration and sensing applications.

Applications

• Voltage-to-frequency conversion for data transmission systems
• Frequency-to-voltage conversion within phase-locked loops
• Absolute temperature-to-frequency conversion using the internal sensor output

Procurement Notes

Verify that the ordering suffix 'H' corresponds to the TO-100 metal can package. Confirm the military temperature rating aligns with specific project requirements, as standard grades differ in operating ranges. Ensure supply decoupling and timing capacitor selection match the datasheet recommendations for optimal linearity.

Selection Notes

Select this component when hermetic sealing is required for harsh environments. The TO-100 package lacks the SYNC pin available in ceramic DIP versions; verify if external synchronization is necessary before choosing this variant. Consider the lower sink current specification compared to other package options when designing output interfaces.

Part Context

The AD537 series consists of complete voltage-to-frequency converters designed for high accuracy and low power consumption. The J grade indicates operation within the commercial temperature range of 0°C to +70°C. This model represents the analog front-end solution for converting analog signals into digital-compatible frequency pulses.

Replacement Considerations

AD537JD: Ceramic DIP package version. AD537KH: Higher linearity grade in metal can. AD537SH: Extended military temperature range in metal can.