AD698APZ

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

• Single chip solution, contains internal oscillator and voltage reference
• No adjustments required
• Interfaces to half-bridge, 4-wire LVDT
• DC output proportional to position
• 20Hz to 20KHz frequency range
• Unipolar or bipolar output
• Will also decode AC bridge signals
• Outstanding performance such as 0.05% linearity, ±11V output voltage, 20ppm/°C (typ) gain drift
• 5ppm/°C (typ) offset drift
• 28 lead PLCC package, operating temperature range from -40°C to 85°C

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party