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: ؎11 V Gain Drift: 20 ppm/؇ C (typ) Offset Drift: 5 ppm/؇ C (typ) Universal LVDT Signal Conditioner AD698 FUNCTIONAL BLOCK DIAGRAM AMP OSCILLATOR VOLTAGE REFERENCE AD698 B A B FILTER A AMP PRODUCT DESCRIPTION
PRODUCT HIGHLIGHTS All circuit functions are included on the chip. The device will operate with half-bridge LVDTs, LVDTs connected in the series opposed configuration (4-wire), and RVDTs. The AD698 contains a low distortion sine wave oscillator to drive the LVDT primary. Two synchronous demodulation channels of the AD698 are used to detect primary and secondary amplitude. The part divides the output of the secondary by the amplitude of the primary and multiplies by a scale factor.
Analog Devices
