Philips SA5521
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.DESCRIPTION
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 VIEWFEATURES
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 Package (CERDIP) 16-Pin Ceramic Dual In-Line Package (CERDIP) TEMPERATURE RANGE 0 to +70°C 0 to +70°C –40 to +85°C –5...