AD598A 查看數據表（PDF） - Analog Devices
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AD598A Datasheet PDF : 16 Pages
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AD598
–V
MASTER
+V
15k
1 –VS
+VS 20
2 EXC 1
OFFSET 1 19
3 EXC 2
OFFSET 2 18
4 LEV 1
5 LEV 2
0.015µF
6 FREQ 1
SIG REF 17
82.5kΩ
SIG OUT 16
FEEDBACK 15
7 FREQ 2 OUT FILT 14
8 B1 FILT
A1 FILT 13
9 B2 FILT
A2 FILT 12
0.1µF
10 VB AD598
VA 11
0.33µF
0.1µF
–V
SLAVE 1
+V
15k
15k
1 –VS
+VS 20
2 EXC 1
OFFSET 1 19
3 EXC 2
OFFSET 2 18
4 LEV 1
5 LEV 2
SIG REF 17
82.5kΩ
SIG OUT 16
6 FREQ 1 FEEDBACK 15
0.1µF
7 FREQ 2
8 B1 FILT
9 B2 FILT
OUT FILT 14
A1 FILT 13
A2 FILT 12
0.33µF
0.1µF
10 VB AD598 VA 11
–V
15k
1 –VS
SLAVE 2
+V
+VS 20
2 EXC 1
OFFSET 1 19
3 EXC 2
OFFSET 2 18
4 LEV 1
5 LEV 2
SIG REF 17
82.5kΩ
SIG OUT 16
6 FREQ 1 FEEDBACK 15
0.1µF
7 FREQ 2
8 B1 FILT
9 B2 FILT
OUT FILT 14
A1 FILT 13
A2 FILT 12
0.33µF
0.1µF
10 VB AD598 VA 11
SCHAEVITZ E 100 LVDT
MECHANICAL POSITION INPUT
SCHAEVITZ E 100 LVDT
MECHANICAL POSITION INPUT
Figure 21. Multiple LVDTs—Synchronous Operation
SCHAEVITZ E 100 LVDT
MECHANICAL POSITION INPUT
HIGH RESOLUTION POSITION-TO-FREQUENCY
CIRCUIT
In the circuit shown in Figure 22, the AD598 is combined with
an AD652 voltage-to-frequency (V/F) converter to produce an
effective, simple data converter which can make high resolution
measurements.
This circuit transfers the signal from the LVDT to the V/F con-
verter in the form of a current, thus eliminating the errors nor-
mally caused by the offset voltage of the V/F converter. The V/F
converter offset voltage is normally the largest source of error in
such circuits. The analog input signal to the AD652 is converted
to digital frequency output pulses which can be counted by
simple digital means.
This circuit is particularly useful if there is a large degree of
mechanical vibration (hum) on the position to be measured.
The hum may be completely rejected by counting the digital fre-
quency pulses over a gate time (fixed period) equal to a multiple
of the hum period. For the effects of the hum to be completely
rejected, the hum must be a periodic signal.
–Vs
0.1µF
GND
+Vs
0.1µF
1 –VS
2 EXC 1
+VS 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 VB AD598
VA 11
0.33µF
0.1µF
0.02µF
1 +VS
2 TRIM
3 TRIM
AD652
SYNCHRONOUS
VOLTAGE TO
FREQUENCY
CONVERTER
COMP REF 16
COMP“+” 15
COMP“–” 14
4 OP AMP OUT
ANALOG GND 13
5 OP AMP “–”
6 OP AMP “+”
7 10 VOLT INPUT
8 –VS
DIGITAL GND 12
FREQ OUT 11
2.5k
+VS
CLOCK INPUT 10
COS 9
FREQ
OUT
CK
500KHZ
+VS
REV. A
SCHAEVITZ E 100 LVDT
MECHANICAL POSITION INPUT
Figure 22. High Resolution Position-to-Frequency Converter
–11–
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