AD598JR

Overview

The AD598JR is a monolithic LVDT signal conditioning subsystem manufactured by Analog Devices Inc. It converts mechanical position to a unipolar or bipolar DC voltage with high accuracy. The device integrates a low distortion sine wave oscillator and operates on a ratiometric architecture, eliminating the need for adjustments and reducing sensitivity to phase shifts. It supports excitation frequencies from 20 Hz to 20 kHz and accepts secondary input levels between 100 mV and 3.5 V rms. The output voltage range is ±11 V minimum, with a maximum operating supply voltage of 36 V. It functions within a temperature range of 0 °C to +70 °C in a 20-pin SOIC package.

Feature Summary

• Monolithic solution integrating oscillator and decoder circuitry
• Ratiometric decoding insensitive to null voltage and phase shifts
• Supports remote LVDT operation up to 300 feet
• Thermal protection against overload conditions

Applications

• Industrial position sensing systems
• Aerospace telemetry applications
• Electromechanical servo loop integrators

Procurement Notes

Verify the specific suffix JR indicates the commercial grade variant with SOIC packaging. Confirm the operating temperature range aligns with system requirements of 0 °C to +70 °C. Ensure external passive components are selected to set frequency and gain according to the official design procedure. Check for moisture sensitivity handling requirements during assembly.

Selection Notes

Select this component when a complete single-chip LVDT interface is required without external adjustment capabilities. The AD598JR is suitable for commercial environments where the 0 °C to +70 °C range is sufficient. Consider the AD598AD if an extended industrial temperature range of -40 °C to +85 °C is necessary. Verify that the application does not exceed the thermal dissipation limits defined in the datasheet.

Part Context

The AD598JR belongs to the AD598 family of Linear Variable Differential Transformer signal conditioners. This family provides a unified approach to converting transducer mechanical displacement into proportional DC voltages. The JR designation specifically identifies the commercial performance grade housed in a Small Outline Integrated Circuit (SOIC) package, distinguishing it from the ceramic DIP variants available in other grades.

Replacement Considerations

The AD598AD serves as the direct alternative for applications requiring an extended temperature range of -40 °C to +85 °C. Both devices share identical electrical characteristics and pinouts but differ in package type and thermal specifications. No other cross-model substitutes are documented in the provided source material.