Data Sheet AD736
Rev. I | Page 15 of 20
ADDITIONAL APPLICATION CONCEPTS
Figure 25 through Figure 28 show four application concepts.
Figure 25 shows the high input impedance FET input connected to
a multitap attenuator network used in various types of instruments
requiring wide ranges of voltages. For a direct network connection,
the gate-charge bleeding resistor is not required. The impedance of
the FET input is high enough (10
12
Ω) so that the loading error
is negligible. Manufacturers and distributors of the matched
precision resistor networks shown in these figures can easily be
found on the Web. The voltages shown in the diagrams are the
input levels corresponding to 200 mV at each tap. Finally, the
47 kΩ, 1 W resistor and diode pair are a practical input
protection scheme for ac line connection measurements.
Figure 26 shows both inputs connected differentially. Figure 27
shows additional components used for offset correction of the
output amplifier, and Figure 28 shows connections for single-
supply operation such as is the case for handheld devices.
Further information can be found in the AN-268 Application
NoteRMS-to-DC Converters Ease Measurement Tasksand
the RMS to DC Converter Application Guide, both of which
can be found on the Analog Devices, Inc., website.
+V
S
+V
S
C
AV
33µF
47kΩ
1W
C
C
10µF
COM
(OPTIONAL)
OUTPUT
8
7
6
5
1
2
3
4
AD736
+
rms
CORE
+
C
C
V
IN
FULL
WAVE
RECTIFIER
C
F
–V
S
–V
S
+V
S
–V
S
C
AV
BIAS
SECTION
INPUT
AMPLIFIER
8kΩ
OUTPUT
AMPLIFIER
8kΩ
C
F
10µF
1µF
1µF
(OPTIONAL)
+
OPTIONAL
AC COUPLING
CAPACITOR
VIN FOR FULL
SCALE OUTPUT
0.01µF
1kV
2V
20V
200V
9MΩ
900kΩ
90kΩ
10kΩ
V
IN
200mV
BAV199
00834-020
Figure 25. AD736 with a High Impedance Input Attenuator
+V
S
+V
S
C
AV
33µF
COM
OUTPUT
OUTPUT
8
7
6
5
1
2
3
4
AD736
+
rms
CORE
C
C
V
IN
FULL
WAVE
RECTIFIER
C
F
–V
S
–V
S
C
AV
BIAS
SECTION
INPUT
AMPLIFIER
8kΩ
OUTPUT
AMPLIFIER
8kΩ
C
F
10µF
C
C
10µF
1µF
1µF
(OPTIONAL)
+
+IN
INPUT IMPEDANCE: 10
12
Ω||10pF
–IN
AD711
+
3
2
6
00834-021
Figure 26. Differential Input Connection
AD736 Data Sheet
Rev. I | Page 16 of 20
7
+V
S
+V
S
C
AV
33µF
C
C
10µF
COM
OUTPUT
(OPTIONAL)
OUTPUT
8
6
5
1
2
3
4
AD736
+
rms
CORE
+
C
C
V
IN
FULL
WAVE
RECTIFIER
C
F
–V
S
–V
S
+V
S
C
AV
BIAS
SECTION
INPUT
AMPLIFIER
8kΩ
OUTPUT
AMPLIFIER
8kΩ
C
F
10µF
1µF
1µF
(OPTIONAL)
+
V
IN
OUTPUT
V
OS
ADJUST
1MΩ
39MΩ
AC-COUPLED
DC-COUPLED
1MΩ
0.1µF
00834-022
Figure 27. External Output V
OS
Adjustment
+V
S
C
C
10µF
COM
OUTPUT
8
7
6
5
1
2
3
4
AD736
rms
CORE
+
C
C
V
IN
V
IN
FULL
WAVE
RECTIFIER
C
F
–V
S
C
AV
BIAS
SECTION
INPUT
AMPLIFIER
8kΩ
OUTPUT
AMPLIFIER
8kΩ
C
F
10µF
(OPTIONAL)
+
+
1MΩ
0.1µF
33µF
9V
100kΩ
100kΩ
4.7µF
4.7µF
V
S
2
V
S
2
00834-023
Figure 28. Battery-Powered Option
Data Sheet AD736
Rev. I | Page 17 of 20
EVALUATION BOARD
An evaluation board, AD736-EVALZ, is available for
experimentation or becoming familiar with rms-to-dc converters.
Figure 29 is a photograph of the board, and Figure 30 is the top
silkscreen showing the component locations. Figure 31, Figure 32,
Figure 33, and Figure 34 show the layers of copper, and Figure 35
shows the schematic of the board configured as shipped. The board
is designed for multipurpose applications and can be used for the
AD737 as well.
00834-030
Figure 29. AD736 Evaluation Board
00834-032
Figure 30. Evaluation BoardComponent-Side Silkscreen
As shipped, the board is configured for dual supplies and high
impedance input. Optional jumper locations enable low impedance
and dc input connections. Using the low impedance input (Pin 1)
often enables higher input signals than otherwise possible. A dc
connection enables an ac plus dc measurement, but care must
be taken so that the opposite polarity input is not dc-coupled
to ground.
Figure 35 shows the board schematic with all movable jumpers.
The jumper positions in black are default connections; the dotted-
outline jumpers are optional connections. The board is tested prior
to shipment and only requires a power supply connection and a
precision meter to perform measurements.
00834-033
Figure 31. Evaluation BoardComponent-Side Copper
00834-034
Figure 32. Evaluation BoardSecondary-Side Copper
00834-035
Figure 33. Evaluation BoardInternal Power Plane
00834-036
Figure 34. Evaluation BoardInternal Ground Plane

AD736ARZ

Mfr. #:
Manufacturer:
Analog Devices Inc.
Description:
Power Management Specialized - PMIC RMS-DC CONVERTER IC Low Cost-Pwr
Lifecycle:
New from this manufacturer.
Delivery:
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