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AD737JRZ-5-R7 Datasheet(PDF) 16 Page - Analog Devices

Part No. AD737JRZ-5-R7
Description  Low Cost, Low Power, True RMS-to-DC Converter
Download  24 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD737JRZ-5-R7 Datasheet(HTML) 16 Page - Analog Devices

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AD737
Data Sheet
Rev. I | Page 16 of 24
COM
+V
AD589
1.23V
CAV
CC
POWER
DOWN
0.1µF
CC
10µF
SWITCH CLOSED
ACTIVATES
POWER-DOWN
MODE. AD737 DRAWS
JUST 40µA IN THIS MODE
2V
20V
200V
9MΩ
900kΩ
90kΩ
10kΩ
VIN
200mV
VIN
–VS
+
+
+VS
+
1µF
OUTPUT
1MΩ
–VS
+VS
1N4148
1N4148
47kΩ
1W
1µF
+
COMMON
33µF
REF LOW
REF HIGH
31/2 DIGIT ICL7136
TYPE CONVERTER
LOW
HIGH
ANALOG
9V
200kΩ
20kΩ
50kΩ
+
1PRV
0.01µF
RMS
CORE
AD737
BIAS
SECTION
INPUT
AMPLIFIER
8kΩ
8kΩ
1
2
3
4
8
7
6
5
FULL-WAVE
RECTIFIER
Figure 27. 3½ Digit DVM Circuit
COM
INPUT
CAV
CAV
33µF
CF
0.47µF
C1
0.47µF
C5
1µF
C4
2.2µF
R7
100kΩ
R4
5kΩ
R2
5kΩ
R3
78.7kΩ
R5
80.6kΩ
R1
69.8kΩ
1%
R8
100kΩ
C3
0.01µF
0.01µF
C2
0.01µF
CC
POWER
DOWN
INPUT SCALE FACTOR ADJ
VIN
–VS
OUTPUT
+VS
+
OUTPUT
AD737
+
5V
5V
2.5V
AD8541AR
5V
NC
NC = NO CONNECT
OUTPUT ZERO
ADJUST
1
2
3
4
8
7
6
5
1
4
7
5
3
6
2
Figure 28. Battery-Powered Operation for 200 mV Maximum RMS Full-Scale Input
VOUT
RMS
CORE
CC
VIN
CF
10µF
COM
OUTPUT
AD737
BIAS
SECTION
INPUT
AMPLIFIER
SCALE FACTOR
ADJUST
8kΩ
8kΩ
POWER
DOWN
–VS
+VS
+
CAV
1
2
3
4
8
7
6
5
100Ω
200Ω
CAV
33µF
CC
10µF
+
+
FULL-WAVE
RECTIFIER
Figure 29. External Scale Factor Trim


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