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SA5521N Dataheets PDF



Part Number SA5521N
Manufacturers Philips
Logo Philips
Description LVDT signal conditioner
Datasheet SA5521N DatasheetSA5521N Datasheet (PDF)

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.

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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 Package (CERDIP) 16-Pin Ceramic Dual In-Line Package (CERDIP) TEMPERATURE RANGE 0 to +70°C 0 to +70°C –40 to +85°C –55 to +125°C –40 to +85°C ORDER CODE NE5521N NE5521D SA5521N SE5521F SA5521D DWG # 0407A 0171B 0407A 0583A 0582B ABSOLUTE MAXIMUM RATINGS SYMBOL VCC Supply voltage Split supply voltage Operating temperature range NE5521 SA5521 SE5521 Storage temperature range Power dissipation1 PARAMETER RATING +20 ±10 0 to 70 –40 to +85 –55 to +125 –65 to +125 910 UNIT V V °C °C °C °C mW TA TSTG PD NOTES: 1. For derating, see typical power dissipation versus load curves (Figure 1). August 31, 1994 901 853-0043 13721 Philips Semiconductors Linear Products Product specification LVDT signal conditioner NE/SA/SE5521 BLOCK DIAGRAM VREF 16 15 FEEDBACK 10k 10k 17 CT RT V+ 11 10k 18 10k –IN +IN AMP OUT 3 – 2 1 + SYNCHRONOUS DEMODULATOR AUX AMP 4 6 7 OSC SINE CONV – + – + 14 12 VREF/2 GND/V– LVDT IN SYNC OSC 13 OSC 5 DOMOD OUT NOTE: Pin numbers are for F, N packages. PIN DEFINITIONS FOR D, F AND N PACKAGES PIN NO. D 1 2 3 4 5 6 7 8 --9 10 F, N 1 2 3 4 5 6 7 8 9 10 11 12 SYMBOL Amp Out +IN –IN LVDT IN DEMOD OUT SYNC GND NC NC NC RT VREF/2 Auxiliary Amplifier Out. Auxiliary Amplifier non-inverting input. Auxiliary Amplifier inverting input. Input to Synchronous Demodulator from the LVDT/RVDT secondary. Pulsating DC output from the Synchronous Demodulator output. This voltage should be filtered before use. Synchronizing input for the Synchronizing Demodulator. This input should be connected to the OSC or OSC output. Sync is referenced to VREF/2. Device return. Should be connected to system ground or to the negative supply. No internal connection. No internal connection. No internal connection. A temperature stable 18kΩ resistor should be connected between this pin and Pin 7. A high impedance source of one half the potential applied to VREF. The LVDT/RVDT secondary return should be to this point. A bypass capacitor with low impedance at the oscillator frequency should also be connected between this pin and ground. Oscillator sine wave output that is 180° out of phase with the OSC signal. The LVDT/RVDT primary is usually connected between OSC and OSC pins. Oscillator sine wave output. The LVDT/RVDT primaries are usually connected between OSC and OSC pins. Usually connected to the OSC output for unity gain, a resistor between this pin and OSC, and one between this pin and ground can provide for a change in the oscillator output pin amplitudes. Reference voltage input for the oscillator and sine converter. This voltage MUST be stable and must not exceed +V supply voltage. Oscillator frequency-determining capacitor. The capacitor connected between this pin and ground should be a temperature-stable type. Positive supply connection. DEFINITION 11 12 13 14 15 16 13 14 15 16 17 18 OSC OSC FEEDBACK VREF CT +V August 31, 1994 902 Philips Semiconductors Linear Products Product specification LVDT signal conditioner NE/SA/SE5521 DC ELECTRICAL CHARACTERISTICS V+ = VREF = 10V, TA = 0 to 70°C for NE5521, TA = –55 to +125°C for SE5521, TA = –40 to 85°C for SA5521, Frequency = 1kHz, unless otherwise noted. SYMBOL VCC IREF VREF PD PARAMETER Supply current Reference current Reference voltage range Power dissipation V REF 8.8 1.5 0.4 0.005 TA = 25°C ±0.9 0.05 2.5 300 5VP-P input 170 ±0.05 V REF 2 ±1.4 5 –600 –234 ±0.1 ±0.5 –600 100 AV = 1 RL = 10kΩ TA = 25°C 7 –210 10 385 1.3 1.6 8.2 42 100 7 50 100 ±1 ±5 –500 ±0.1 300 ±3 0.01 ±5 5 182 TEST CONDITIONS NE5.


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