Product Summary

The AD598AD is a complete, monolithic Linear Variable Differential Transformer (LVDT) signal conditioning subsystem. It is used in conjunction with LVDTs to convert transducer mechanical position to a unipolar or bipolar dc voltage with a high degree of accuracy and repeatability. All circuit functions are included on the chip. With the addition of a few external passive components to set frequency and gain, the AD598AD converts the raw LVDT secondary output to a scaled dc signal. The device can also be used with RVDT transducers. The AD598AD contains a low distortion sine wave oscillator to drive the LVDT primary. The LVDT secondary output consists of two sine waves that drive the AD598AD directly. The AD598AD operates upon the two signals, dividing their difference by their sum, producing a scaled unipolar or bipolar dc output.

Parametrics

AD598AD absolute maximum ratings: (1)Total Supply Voltage +VS to –VS: +36 V; (2)Storage Temperature Range: D Package: –65℃ to +150℃; (3)Operating Temperature Range: –40℃ to +85℃; (4)Lead Temperature Range (Soldering 60 sec): +300℃; (5)Power Dissipation Up to +65℃: 1.2 W; (6)Derates Above +65℃: 12 mW/℃.

Features

AD598AD features: (1)Single Chip Solution, Contains Internal Oscillator and Voltage Reference; (2)No Adjustments Required; (3)Insensitive to Transducer Null Voltage; (4)Insensitive to Primary to Secondary Phase Shifts; (5)DC Output Proportional to Position; (6)20 Hz to 20 kHz Frequency Range; (7)Single or Dual Supply Operation; (8)Unipolar or Bipolar Output; (9)Will Operate a Remote LVDT at Up to 300 Feet; (10)Position Output Can Drive Up to 1000 Feet of Cable; (11)Will Also Interface to an RVDT; (12)Outstanding Performance: Linearity: 0.05% of FS max; Output Voltage: ±11 V min; Gain Drift: 50 ppm/℃ of FS max; Offset Drift: 50 ppm/℃ of FS max.

Diagrams

AD598AD functional block diagram

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