NE5521N View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
NE5521N Datasheet PDF : 5 Pages
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Philips Semiconductors Linear Products
LVDT signal conditioner
Product specification
NE/SA/SE5521
BLOCK DIAGRAM
17
CT
11
RT
18
V+
3
–IN
+IN 2
AMP 1
OUT
NOTE:
Pin numbers are for F, N packages.
VREF
16
OSC
SINE
CONV
AUX AMP
–
+
–
+
10k
10k
10k
–
+
10k
SYNCHRONOUS
DEMODULATOR
5
DOMOD OUT
15
FEEDBACK
13
OSC
14
OSC
12
VREF/2
7
GND/V–
4
LVDT IN
6
SYNC
PIN DEFINITIONS FOR D, F AND N PACKAGES
PIN NO.
D F, N
SYMBOL
DEFINITION
11
Amp Out
Auxiliary Amplifier Out.
22
+IN
Auxiliary Amplifier non-inverting input.
33
–IN
Auxiliary Amplifier inverting input.
44
LVDT IN
Input to Synchronous Demodulator from the LVDT/RVDT secondary.
55
66
77
DEMOD OUT
SYNC
GND
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.
88
NC
No internal connection.
-- 9
NC
No internal connection.
-- 10
9 11
10 12
NC
RT
VREF/2
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.
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
VREF
Reference voltage input for the oscillator and sine converter. This voltage MUST be stable and must not
exceed +V supply voltage.
15 17
CT
Oscillator frequency-determining capacitor. The capacitor connected between this pin and ground should
be a temperature-stable type.
16 18
+V
Positive supply connection.
August 31, 1994
902
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