SA5521

Philips Semiconductors Linear Products Product specification LVDT signal conditioner NE/SA/SE5521 DESCRIPTION The NE/SA/SE5521 is a signal conditioning circuit for use with Linear Variable Differential Transformers (LVDTs) and Rotary Variable Differential Transformers (RVDTs). The chip includes a low distortion, amplitude-stable sine wave oscillator with programmable frequency to drive the primary of the LVDT/RVDT, a synchronous demodulator to convert the LVDT/RVDT output amplitude and phase to position information, and an output amplifier to provide amplification and filtering of the demodulated signal. PIN CONFIGURATIONS F, N Packages AMP OUT 1 +IN 2 –IN 3 LVDT IN 4 DEMOD OUT 5 SYNC 6 18 V+ 17 C T 16 V REF 15 FEEDBACK 14 OSC 13 OSC 12 V REF/2 11 R T 10 N.C. TOP VIEW FEATURES GND 7 N.C. 8 N.C. 9 Low distortion Single supply 5V to 20V, or dual supply ±2.5V to ±10V Oscillator frequency 1kHz to 20kHz Capable of ratiometric operation Low power consumption (182mV typ) APPLICATIONS D1 Package AMP OUT 1 +IN 2 –IN 3 LVDT IN 4 DEMOD OUT 5 SYNC 6 GND 7 N.C. 8 TOP VIEW NOTE: 1. SOL — released in large SO package only. 16 V+ 15 CT 14 V REF 13 FEEDBACK 12 OSC 11 OSC 10 VREF/2 9 RT LVDT signal conditioning RVDT signal conditioning LPDT signal conditioning Bridge circuits ORDERING INFORMATION DESCRIPTION 18-Pin Plastic Dual In-Line Package (DIP) 16-Pin Small Outline Large (SOL) Package 18-Pin Plastic Dual In-Line Package (DIP) 18-Pin Ceramic Dual In-Line Packag...