sa5521n NXP Semiconductors, sa5521n Datasheet - Page 3

• Manufacturer Part Number: sa5521n
• Description: Lvdt Signal Conditioner
• Manufacturer: NXP Semiconductors

Philips Semiconductors
BLOCK DIAGRAM
PIN DEFINITIONS
2003 Dec 03
PIN NO.
LVDT signal conditioner
NOTE:
Pin numbers are for N packages.
10
12
13
14
15
16
17
18
11
1
2
3
4
5
6
7
8
9
DEMOD OUT
FEEDBACK
SYMBOL
SYMBOL
Amp Out
LVDT IN
V
SYNC
GND
OSC
OSC
V
REF
+IN
–IN
NC
NC
NC
R
C
+V
REF
T
T
/2
AMP
OUT
–IN
+IN
C
R
V+
T
T
17
18
11
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 V
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 18 k resistor should be connected between this pin and Pin 7.
A high impedance source of one half the potential applied to V
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.
3
2
1
V
OSC
REF
–
+
16
AUX AMP
SINE
CONV
Figure 2. Block diagram.
DEMOD OUT
10 k
REF
/2.
–
+
5
3
SYNCHRONOUS
DEMODULATOR
10 k
DEFINITION
DEFINITION
10 k
–
+
10 k
REF
. The LVDT/RVDT secondary return
15
13
14
12
7
4
6
SL00327
FEEDBACK
OSC
V
GND/V–
SYNC
OSC
LVDT IN
REF
/2
NE/SA5521
Product data