AD537JD

Overview

The AD537JD is a monolithic voltage-to-frequency and frequency-to-voltage converter manufactured by Analog Devices Inc. It operates within a supply voltage range of 4.5 V to 36 V single-ended or ±5 V to ±18 V dual-supply, consuming a quiescent current of 1.2 mA typical. The device features a full-scale frequency range up to 150 kHz with nonlinearity specified at 0.25% maximum for 100 kHz operation and 0.15% maximum for 10 kHz operation. It includes an internal 1.00 V reference and a 1.00 mV/K absolute temperature output. Rated for commercial performance between 0°C and +70°C, it utilizes a 14-lead ceramic DIP package.

Feature Summary

• Integrates high-impedance input amplifier, precision oscillator, and open-collector output driver into a single monolithic structure
• Provides internal 1.00 V precision reference and 1.00 mV/K absolute temperature sensor outputs
• Supports direct conversion of positive or negative voltage and current inputs without external signal conditioning
• Enables synchronous operation via dedicated SYNC pin for master oscillator locking

Applications

• Two-wire data transmission systems utilizing current modulation over twisted pairs
• Frequency-to-voltage conversion within phase-locked loop circuits
• Absolute temperature-to-frequency conversion using the internal 1 mV/K output
• Thermocouple interface circuits requiring linearization and offset compensation

Procurement Notes

Verify component authenticity through authorized Analog Devices channels or certified distributors. Confirm the specific AD537JD suffix matches the required commercial temperature grade (0°C to +70°C) and ceramic DIP packaging. Review the official datasheet for calibration procedures regarding scale and offset adjustments to ensure system accuracy meets design specifications.

Selection Notes

Select the AD537JD when commercial temperature stability is sufficient and low power consumption is required. The ceramic DIP package offers hermetic sealing benefits compared to plastic variants. Consider the AD537KD if tighter linearity specifications are necessary, or the AD537SD for extended military-grade temperature ranges. Ensure timing capacitor selection aligns with desired frequency scaling and dielectric absorption requirements.

Part Context

The AD537 series represents a family of high-performance analog converters designed for precision measurement applications. The JD variant specifically denotes the commercial temperature range version housed in a 14-lead side-brazed ceramic dual in-line package. This construction supports robust operation in industrial environments while maintaining the electrical characteristics defined for the standard AD537 architecture.

Replacement Considerations

Public confirmed substitute part numbers: AD537JH, AD537KH, AD537SH.