The AD598 is an LVDT signal conditioning subsystem produced by AD company. It can convert LVDT to unipolar or bipolar DC voltage with high accuracy and repeatability.
The AD598 provides a complete, single‑chip solution for conditioning Linear Variable Differential Transformers (LVDTs) and Rotary VDTs. It contains an internal oscillator, voltage reference and ratiometric decoder, eliminating the need for external adjustments and making the circuit insensitive to null voltage and phase shifts.
The datasheet includes detailed specifications, functional block diagrams, theory of operation, and design procedures for both dual‑ and single‑supply configurations, allowing designers to select component values for a wide range of LVDT applications.
| Output Voltage Range | +11 V min |
|---|---|
| Output Current | 8 mA (typical) |
| Gain Drift | 20 ppm/°C (typical) |
| Offset Drift | 7 ppm/°C (typical) |
| Excitation Voltage Range | 2.1 V – 24 V rms |
| Power Supply Operating Range | 13 V – 36 V |
| Temperature Range (JR grade) | 0 °C – 70 °C |
| Temperature Range (AD grade) | -40 °C – 85 °C |
The AD598 provides a minimum output voltage of +11 V.
It can operate a remote LVDT at distances up to 300 feet.
Two grades are offered: AD598JR (0 °C‑70 °C, SOIC) and AD598AD (‑40 °C‑85 °C, DIP).
Typical gain drift is 20 ppm per degree Celsius.