AD698APZ LVDT Signal Conditioner ±12V to ±15V Operation 20kHz Bandwidth 0.25% Linearity Single/Dual Supply Industrial Temp Range for Position Sensing and Motion Control

AD698APZ LVDT Signal Conditioner andplusmn;12V to andplusmn;15V Operation 20kHz Bandwidth 0.25% Linearity Single/Dual Supply Industrial Temp Range for Position Sensing andamp; Motion Control

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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

andnbsp; Linearity: 0.05%

andnbsp; Output Voltage: 11 V

andnbsp; Gain Drift: 20 ppm/C (typ)

andnbsp; Offset Drift: 5 ppm/C (typ)

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APPLICATIONS

Most of the applications for the AD598 can also be imple mented with the AD698. Please refer to the applications written for the AD598 for a detailed explanation.

See AD598 data sheet for:

andndash; Proving Ring-Weigh Scale

andndash; Synchronous Operation of Multiple LVDTs

andndash; High Resolution Position-to-Frequency Circuit

This circuit can be used for resistive bridges such as strain gages, or for inductive or capacitive bridges that are commonly used for pressure or flow sensors. The low level signal outputs of these sensors are susceptible to noise and interference and are good candidates for ac signal processing techniques.

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DESCRIPTION

The AD698 is a complete, monolithic Linear Variable Differen tial Transformer (LVDT) signal conditioning subsystem. It is used in conjunction with LVDTs to convert transducer mechan ical 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 op posed 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 second ary amplitude. The part divides the output of the secondary by the amplitude of the primary and multiplies by a scale factor. This eliminates scale factor errors due to drift in the amplitude of the primary drive, improving temperature performance and stability.

The AD698 uses a unique ratiometric architecture to eliminate several of the disadvantages associated with traditional ap proaches to LVDT interfacing. The benefits of this new cir cuit are: no adjustments are necessary; temperature stability is improved; and transducer interchangeability is improved.

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INFORMATION

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