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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 +70C 0 to +70C -40 to +85C -55 to +125C -40 to +85C 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 18k 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 70C for NE5521, TA = -55 to +125C for SE5521, TA = -40 to 85C 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 = 25C 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 = 10k TA = 25C 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 NE5521 Min Typ 12.9 5.3 Max 20 8 V+ 280 5 182 V REF 8.8 1.5 0.4 0.005 0.9 0.05 3.3 170 0.05 V REF 2 1.4 5 -500 -234 0.1 0.5 -210 10 385 1.3 1.6 8.2 42 100 50 1 5 0.1 3 0.01 5 Min SA/SE5521 Typ 12.9 5.3 Max 18 8 V+ 260 UNIT mA mA V mW
Oscillator Section
Oscillator output THD Sine wave distortion Initial amplitude error Tempco of amplitude Init. accuracy of oscillator freq. Temperature coeff. of frequency1 Voltage coeff. of frequency Min OSC (OSC) Load2 RL = 10k No load TA = 25C VRMS % % %/C % %/C %/V(VREF) %FS VP-P 5 25 mV V/5C nA % mV nA nA V/mV V/s MHz V mA
Demodulator Section
r Linearity error Maximum demodulator input VOS TCVOS IBIAS Demodulator offset voltage Demodulator offset voltage drift Demodulator input current VR/2 accuracy
5 25
Auxiliary Output Amplifier
VOS IBIAS IOS AV SR GBW Input offset voltage Input bias current Input offset current Gain Slew rate Unity gain bandwidth product Output voltage swing Output short circuit current to ground or to VCC
NOTES: 1. This is temperature coefficient of frequency for the device only. It is assumed that CT and RT are fixed in value and CT leakage is fixed over the operating temperature range. 2. Minimum load impedance for which distortion is guaranteed to be less than 5%.
August 31, 1994
903
Philips Semiconductors Linear Products
Product specification
LVDT signal conditioner
NE/SA/SE5521
DEFINITION OF TERMS
Oscillator Output Sine Wave Distortion RMS value of the AC voltage at the oscillator output pin. This output is referenced to VREF/2 and is a function of VREF. The Total Harmonic Distortion (THD) of the oscillator output with no load. This is not a critical specification in LVDT/RVDT systems. This figure could be 15% or more without affecting system performance. A measure of the interchangeability of NE/SA/SE5521 parts, not a characteristic of any one part. It is the degree to which the oscillator output of a number of NE/SA/SE5521 samples will vary from the median of that sample. Another measure of the interchangeability of individual NE/SA/SE5521 parts. This is the degree to which the oscillator frequency of a number of NE/SA/SE5521 samples will vary from the median of that sample with a given timing capacitor. A measure of how the oscillator amplitude varies with ambient temperature as that temperature deviates from a 25C ambient. A measure of how the oscillator frequency varies with ambient temperature as that temperature deviates from a 25C ambient. The degree to which the oscillator frequency will vary as the reference voltage (VREF) deviates from +10V. Minimum load impedance for which distortion is guaranteed to be less than 5%. The degree to which the DC output of the demodulator/amplifier combination matches a change in the AC signal at the demodulator input. It is measured as the worst case nonlinearity from a straight line drawn between positive and negative fullscale end points. The maximum signal that can be applied to the demodulator input without exceeding the specified linearity error.
Initial Amplitude Error
Initial Accuracy of Oscillator Frequency
Tempco of Oscillator Amplitude Tempco of Oscillator Frequency Voltage Coefficient of Oscillator Frequency Min OSC (OSC) Load Linearity Error
Maximum Demodulator Input
APPLICATION INFORMATION
OSC frequency + V REF * 1.3V V REF (R T ) 1.5k) C T
2000 DEVICE POWER DISSIPATION (mW) 1000 800 700 600 500 400 300 200 100 0.2 10V 5V 0.4 0.6 0.8 12 3 15V VREF = V+ = 20V PDMAX (N PACKAGE) AT TA = 70C, TJ(MAX) = +150C PDMAX (SO PACKAGE) AT TA = +85C, TJ(MAX) = +150C PDMAX (F PACKAGE) AT TA = +125C, TJ(MAX) = +165C PDMAX (F PACKAGE) AT TA = +125C, TJ(MAX) = +150C
OSC-OSC LOAD (k)
Figure 1. Device Power Dissipation vs OSC - OSC Load at +25C
August 31, 1994
904
Philips Semiconductors Linear Products
Product specification
LVDT signal conditioner
NE/SA/SE5521
16
16 14 12 I(mA) 10 8 6 ICC
8 fOSC (%) 0
-8
IREF
-16 5 8 10 12 14 16 18 20 VCC = VREF (V)
4 -55
-40
0 TA (C)
25
70 85 125
Figure 2. Oscillator Frequency Variation With Voltage (Normalized to VREF = VCC = 10V) TA = +25C
Figure 4. IREF and ICC vs Temperature (VREF = VCC = 10V)
20
15 I(mA)
ICC
10
IREF
5
0
5
10
15
20
25
VCC = VREF (V)
Figure 3. IREF and ICC vs Voltage (TA = +25C)
August 31, 1994
905

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