NJU9214FG1 Просмотр технического описания (PDF) - Japan Radio Corporation
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NJU9214FG1 Datasheet PDF : 28 Pages
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NJU9214
(4) Application circuit of AC voltage and AC current measurement
In case of AC voltage and AC current measurement, AC-DC conversion is required in the external circuit. In
use of the mean square circuit, the measurement circuit realizes low cost system. And also in use of RMS/DC
converter, it realizes a root-mean-square measurement. The circuit example using AD736 ( Analog Devices,
Inc. ) is shown below for a root-mean-square measurement.
( The circuit is for only reference, so please refer to the data book of Analog Devices, Inc. for details. )
0.022uF
10M
VR2(PIN99)
ACOUT(PIN1)
NJU9214
VR7(PIN94)
RMSIN(PIN3)
AC4V to 4000 Vrange
others
SW8
DCmA,ACmA
AC400mV,ACA
AGND
+-
SW4_1 VDDA
1N4148
47K
10uF
1
SW4_2
2
AC400mV
3
1N4148
AC400mV
4
VSSA
Rectifier circuit block
AD736
Full-wave
8
rectifier
7
6
RMS
Converter
5
block
10uF
AGND
VDDA
+
33uF
VSSA
(5) Notes of application circuits
1. The power source for NJU9214 is required stable, and enough current drivability.
2. Capacitors marked with ∗1 require low-leak type like as the polypropylene film.
3. Resistance ratio precision of input attenuator block affects measurement precision.
Resistances marked with ∗2 requires within 0.01% tolerance resistors or adjustment by the trimmer
potentiometer.
4. Designing of circuit pattern requires low wiring resistance between AGND terminal and SGND terminal.
5. Constants of resistances for voltage dividing and decoupling capacitor are not guaranteed value as to
characteristic. Re adjustment is sometime required depending on elements and peripheral circuit.
6. RMS / DC converter requires full-scale and zero adjustment.
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
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