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PRODUCT DESCRIPTION

The AD698 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 de gree 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 AD698 converts the raw LVDT output to a scaled dc signal. The device will operate with half-bridge LVDTs, LVDTs connected in the series opposed configuration (4-wire), and RVDTs.

FEATURES

Single Chip Solution, Contains Internal Oscillator and Voltage Reference

No Adjustments Required

Interfaces to Half-Bridge, 4-Wire LVDT

DC Output Proportional to Position

20 Hz to 20 kHz Frequency Range

Unipolar or Bipolar Output

Will Also Decode AC Bridge Signals

Outstanding Performance

Linearity: 0.05

Output Voltage: 611 V

Gain Drift: 20 ppm/8C (typ)

Offset Drift: 5 ppm/8C (typ)