AD598AD

The AD598AD is a complete, monolithic Linear Variable Differential Transformer (LVDT) signal conditioning subsystem from Analog Devices. It is designed to convert the mechanical position of an LVDT transducer into a unipolar or bipolar DC voltage with high accuracy and repeatability. All circuit functions are integrated on-chip, requiring only a few external passive components to set the excitation frequency and gain.

Key electrical specifications include a voltage input and voltage output type, a supply current of 15 mA typical, and an excitation frequency range of 20 Hz to 20 kHz determined by an external capacitor. The maximum excitation voltage for the LVDT primary drive is 24 V rms, and the minimum secondary input level is 100 mV rms. The device operates over a temperature range of -40°C to +85°C.

The AD598AD is housed in a 20-pin ceramic DIP (CDIP) package with a 0.300" body width and 7.62 mm lead spacing. It features through-hole mounting, making it suitable for prototyping and applications requiring robust mechanical connections. The device uses a ratiometric architecture to eliminate the need for adjustments and to improve temperature stability and transducer interchangeability.