AD598 Datasheet, PDF (13/16 Pages) Analog Devices – LVDT Signal Conditioner

OUTPUT
MECHANICAL
POSITION
SCHAEVITZ E 100
LVDT
INPUT
MECHANICAL
POSITION
SCHAEVITZ E 100
LVDT
AD598
0.015µF
0.1µF
0.015µF
0.1µF
0.1µF
1 –V_S
2 EXC 1
+V_S 20
OFFSET 1 19
3 EXC 2
OFFSET 2 18
4 LEV 1
SIG REF 17
5 LEV 2
SIG OUT 16
6 FREQ 1 FEEDBACK 15
7 FREQ 2 OUT FILT 14
8 B1 FILT
A1 FILT 13
9 B2 FILT
A2 FILT 12
10 V_{B AD598} V_A 11
0.1µF
1 –V_S
2 EXC 1
+V_S 20
OFFSET 1 19
3 EXC 2
OFFSET 2 18
4 LEV 1
SIG REF 17
5 LEV 2
SIG OUT 16
6 FREQ 1 FEEDBACK 15
7 FREQ 2 OUT FILT 14
8 B1 FILT
A1 FILT 13
9 B2 FILT
A2 FILT 12
10 V_{B AD598} V_A 11
MASS ON SPRING
620 N/m
33 GRAMS
+V
30k
0.33µF ^1µF
0.1µF
0.01µF
+V
4.99k
0.33µF
0.1µF
100Ω _0.33µF
1000pF
10k
0.068µF
49.9k
150k
+V _0.1µF
LM675
4.99k
GUARDIAN SOLENOID
12 VDC 2-INT-12D
62 CONE
IN4740A
10V
+V
20k
47µF
47µF
+25V
33µF
GND
POWER SUPPLY
Figure 24. Mechanical Follower Servo-Loop
–V
0.1µF
+V
0.1µF
A
B
LVDT 1
SCHAEVITZ E 100
C
1 –V_S
2 EXC 1
+V_S 20
OFFSET 1 19
3 EXC 2
OFFSET 2 18
4 LEV 1
SIG REF 17
5 LEV 2
0.015µF
SIG OUT 16
6 FREQ 1 FEEDBACK 15
7 FREQ 2 OUT FILT 14
8 B1 FILT
A1 FILT 13
9 B2 FILT
A2 FILT 12
0.1µF
10 V_{B AD598}
V_A 11
R2 80.9kΩ
0.33µF
0.1µF
V_OUT ± 10V
FULL SCALE
D
LVDT 2
SCHAEVITZ E 100
VOUT
=
(VA–VB)+(VC–VD)
(VA+VB)+(VC+VD)
•
500µA
•
R2
Figure 25. Differential Gaging
REV. A
–13–