Name: SA5521N
SKU: SA5521N
Price: 76.92905 USD
Availability: InStock

Philips Semiconductors Linear Products Product specification

NE/SA/SE5521LVDT signal conditioner

901

August 31, 1994 853-0043 13721

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.

FEATURES

• 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

• LVDT signal conditioning

• RVDT signal conditioning

• LPDT signal conditioning

• Bridge circuits

PIN CONFIGURATIONS

AMP OUT

+IN

–IN

LVDT IN

DEMOD OUT

SYNC

GND

N.C.

V+

REF

FEEDBACK

OSC

REF/2

N.C.

AMP OUT

+IN

–IN

LVDT IN

DEMOD OUT

SYNC

GND

N.C.

V+

REF

FEEDBACK

OSC

REF/2

F, N Packages

TOP VIEW

Package

TOP VIEW

NOTE:

1. SOL — released in large SO package only.

ORDERING INFORMATION

DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #

18-Pin Plastic Dual In-Line Package (DIP) 0 to +70°C NE5521N 0407A

16-Pin Small Outline Large (SOL) Package 0 to +70°C NE5521D 0171B

18-Pin Plastic Dual In-Line Package (DIP) –40 to +85°C SA5521N 0407A

18-Pin Ceramic Dual In-Line Package (CERDIP) –55 to +125°C SE5521F 0583A

16-Pin Ceramic Dual In-Line Package (CERDIP) –40 to +85°C SA5521D 0582B

ABSOLUTE MAXIMUM RATINGS

SYMBOL PARAMETER RATING UNIT

Supply voltage +20 V

Split supply voltage ±10 V

Operating temperature range

NE5521

SA5521

SE5521

0 to 70

–40 to +85

–55 to +125

°C

STG

Storage temperature range –65 to +125 °C

Power dissipation

910 mW

NOTES:

1. For derating, see typical power dissipation versus load curves (Figure 1).

Philips Semiconductors Linear Products Product specification

NE/SA/SE5521LVDT signal conditioner

August 31, 1994

902

BLOCK DIAGRAM

NOTE:

Pin numbers are for F, N packages.

OSC

AUX AMP

DOMOD OUT

SINE

CONV

10k

–

FEEDBACK

OSC

GND/V–

LVDT IN

SYNC

–

REF

OSC

V+

–IN

+IN

AMP

OUT

SYNCHRONOUS

DEMODULATOR

PIN DEFINITIONS FOR D, F AND N PACKAGES

PIN NO.

SYMBOL

DEFINITION

D F, N

SYMBOL

DEFINITION

1 1 Amp Out Auxiliary Amplifier Out.

2 2 +IN Auxiliary Amplifier non-inverting input.

3 3 –IN Auxiliary Amplifier inverting input.

4 4 LVDT IN Input to Synchronous Demodulator from the LVDT/RVDT secondary.

5 5 DEMOD OUT Pulsating DC output from the Synchronous Demodulator output. This voltage should be filtered before

use.

6 6 SYNC Synchronizing input for the Synchronizing Demodulator. This input should be connected to the OSC or

OSC

output. Sync is referenced to V

REF

/2.

7 7 GND Device return. Should be connected to system ground or to the negative supply.

8 8 NC No internal connection.

-- 9 NC No internal connection.

-- 10 NC No internal connection.

9 11 R

A temperature stable 18kΩ resistor should be connected between this pin and Pin 7.

10 12 V

REF

/2 A high impedance source of one half the potential applied to V

REF

. 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.

11 13 OSC 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.

12 14 OSC Oscillator sine wave output. The LVDT/RVDT primaries are usually connected between OSC and OSC

pins.

13 15 FEEDBACK Usually connected to the OSC output for unity gain, a resistor between this pin and OSC, and one be-

tween this pin and ground can provide for a change in the oscillator output pin amplitudes.

14 16 V

REF

Reference voltage input for the oscillator and sine converter. This voltage MUST be stable and must not

exceed +V supply voltage.

15 17 C

Oscillator frequency-determining capacitor. The capacitor connected between this pin and ground should

be a temperature-stable type.

16 18 +V Positive supply connection.

Philips Semiconductors Linear Products Product specification

NE/SA/SE5521LVDT signal conditioner

August 31, 1994

903

DC ELECTRICAL CHARACTERISTICS

V+ = V

REF

= 10V, T

= 0 to 70°C for NE5521, T

= –55 to +125°C for SE5521, T

= –40 to 85°C for SA5521, Frequency = 1kHz, unless

otherwise noted.

SYMBOL

PARAMETER

TEST CONDITIONS

NE5521 SA/SE5521

UNIT

SYMBOL

PARAMETER

TEST CONDITIONS

Min Typ Max Min Typ Max

UNIT

Supply current 12.9 20 12.9 18 mA

REF

Reference current 5.3 8 5.3 8 mA

REF

Reference voltage range 5 V+ 5 V+ V

Power dissipation 182 280 182 260 mW

Oscillator Section

Oscillator output R

= 10kΩ

REF

8.8

REF

8.8

RMS

THD Sine wave distortion No load 1.5 1.5 %

Initial amplitude error T

= 25°C 0.4 ±3 0.4 ±3 %

Tempco of amplitude 0.005 0.01 0.005 0.01 %/°C

Init. accuracy of oscillator freq. T

= 25°C ±0.9 ±5 ±0.9 ±5 %

Temperature coeff. of frequency

0.05 0.05 %/°C

Voltage coeff. of frequency 2.5 3.3 %/V(V

REF

)

Min OSC (OSC) Load

300 170 300 170 Ω

Demodulator Section

∈

Linearity error 5V

P-P

input ±0.05 ±0.1 ±0.05 ±0.1 %FS

Maximum demodulator input

REF

P-P

Demodulator offset voltage ±1.4 ±5 ±1.4 ±5 mV

TCV

Demodulator offset voltage drift 5 25 5 25 µV/

BIAS

Demodulator input current –600 –234 –500 –234 nA

R/2

accuracy ±0.1 ±1 ±0.1 ±1 %

Auxiliary Output Amplifier

Input offset voltage ±0.5 ±5 ±0.5 ±5 mV

BIAS

Input bias current –600 –210 –500 –210 nA

Input offset current 10 50 10 50 nA

Gain 100 385 100 385 V/mV

SR Slew rate 1.3 1.3 V/µs

GBW Unity gain bandwidth product A

= 1 1.6 1.6 MHz

Output voltage swing R

= 10kΩ 7 8.2 7 8.2 V

Output short circuit current to

ground or to V

= 25°C 42 100 42 100 mA

NOTES:

1. This is temperature coefficient of frequency for the device only. It is assumed that C

and R

are fixed in value and C

leakage is fixed over

the operating temperature range.

2. Minimum load impedance for which distortion is guaranteed to be less than 5%.

Part #	SA5521N
Description	IC,LVDT CONDITIONER,BIPOLAR18Pin Plastic Dip
Category	IC
Availability	In Stock
Qty	305

Qty	Price
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38 +	$47.78926

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SA5521N

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