AD598

a FEATURES Single Chip Solution, Contains Internal Oscillator and Voltage Reference No Adjustments Required Insensitive to Transducer Null Voltage Insensitive to Primary to Secondary Phase Shifts DC Output Proportional to Position 20 Hz to 20 kHz Frequency Range Single or Dual Supply Operation Unipolar or Bipolar Output Will Operate a Remote LVDT at Up to 300 Feet Position Output Can Drive Up to 1000 Feet of Cable Will Also Interface to an RVDT Outstanding Performance Linearity: 0.05% of FS max Output Voltage: ؎ 11 V min Gain Drift: 50 ppm/؇ C of FS max Offset Drift: 50 ppm/ ؇C of FS max PRODUCT DESCRIPTION EXCITATION (CARRIER) VA 11 OSC AMP LVDT Signal Conditioner AD598 FUNCTIONAL BLOCK DIAGRAM 3 2 17 A–B A+B AD598 FILTER AMP 16 VOUT LVDT 10 VB PRODUCT HIGHLIGHTS The AD598 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 AD598 converts the raw LVDT secondary output to a scaled dc signal. The device can also be used with RVDT transducers. The AD598 contains a low distortion sine wave oscillator to drive the LVDT primary. The LVDT secondary output consists of two sine waves that drive the AD598 directly. The AD598 operate...