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AD637JQ Datasheet(PDF) 9 Page - Analog Devices

No. de pieza AD637JQ
Descripción Electrónicos  High Precision, Wide-Band RMS-to-DC Converter
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD637JQ Datasheet(HTML) 9 Page - Analog Devices

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REV. E
–9–
AD637
VECTOR SUMMATION
Vector summation can be accomplished through the use of two
AD637s as shown in Figure 16. Here the averaging capacitors
are omitted (nominal 100 pF capacitors are used to insure
stability of the filter amplifier), and the outputs are summed as
shown. The output of the circuit is
VO = V X
2 +V
Y
2
This concept can be expanded to include additional terms by
feeding the signal from Pin 9 of each additional AD637 through
a 10 k
Ω resistor to the summing junction of the AD711, and ty-
ing all of the denominator inputs (Pin 6) together.
If CAV is added to IC1 in this configuration, the output is
V X
2 +V
Y
2 . If the averaging capacitor is included on both
IC1 and IC2, the output will be
V X
2 +V
Y
2 .
This circuit has a dynamic range of 10 V to 10 mV and is lim-
ited only by the 0.5 mV offset voltage of the AD637. The useful
bandwidth is 100 kHz.
BUFFER
AD637
SQUARER/DIVIDER
BIAS
SECTION
FILTER
25k
25k
1
2
3
4
5
6
7
14
13
12
11
10
9
8
CAV
–VS
+VS
+
ABSOLUTE
VALUE
NC
SIGNAL
INPUT
NC
100 F
AD548JN
–VS
+VS
FILTERED
V rms OUTPUT
1 F
1 F
1000pF
6.8M
NOTE: VALUES CHOSEN TO GIVE 0.1%
AVERAGING ERROR @ 1Hz
1M
50k
–VS
+VS
OUTPUT
OFFSET
ADJUST
CAV1
3.3 F
499k
1%
R
3.3M
3.3M
VIN
2
V rms
Figure 15. AD637 as a Low Frequency RMS Converter
BUFFER
AD637
SQUARER/DIVIDER
BIAS
SECTION
FILTER
25k
25k
1
2
3
4
5
6
7
14
13
12
11
10
9
8
–VS
+VS
ABSOLUTE
VALUE
100pF
VX IN
BUFFER
AD637
SQUARER/DIVIDER
BIAS
SECTION
FILTER
25k
25k
1
2
3
4
5
6
7
14
13
12
11
10
9
8
–VS
+VS
ABSOLUTE
VALUE
100pF
VX IN
VOUT =
VX2 + VV2
5pF
10k
AD711K
EXPANDABLE
10k
10k
20k
Figure 16. AD637 Vector Sum Configuration


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