AD71056AR-RL Analog Devices Inc, AD71056AR-RL Datasheet - Page 11
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AD71056AR-RL
Manufacturer Part Number
AD71056AR-RL
Description
IC ENERGY METER W/OSC 16-SOIC
Manufacturer
Analog Devices Inc
Datasheet
1.AD71056ARZ-RL.pdf
(20 pages)
Specifications of AD71056AR-RL
Input Impedance
320 KOhm
Measurement Error
0.1%
Voltage - I/o High
2.4V
Voltage - I/o Low
0.8V
Current - Supply
5mA
Voltage - Supply
4.75 V ~ 5.25 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.154", 3.90mm Width)
Meter Type
Single Phase
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
where:
i(t) is the instantaneous current.
I
I
β
Using Equation 2 and Equation 3, the real power, P, can be
expressed in terms of its fundamental real power (P
harmonic real power (P
where:
and P
0
h
h
is the dc component.
is the rms value of Current Harmonic h.
is the phase angle of the current harmonic.
P = P
P
ϕ
ϕ
t i
P
) (
H
1
1
h
H
= V
= α
= α
=
=
0 I
1
h
1
∞
∑
h
1
≠1
+ P
− β
− β
× I
V
+
h
H
1
1
h
× I
2
cos ϕ
×
h
h
cos ϕ
∞
∑
≠
1
o
H
I
) as
h
h
×
sin
(
h
ω
t
+
β
h
)
1
) and
Rev. A | Page 11 of 20
(5)
(3)
(4)
In Equation 5, a harmonic real power component is generated
for every harmonic, provided that harmonic is present in both
the voltage and current waveforms. The power factor calculation
has previously been shown to be accurate in the case of a pure
sinusoid. Therefore, the harmonic real power must also correctly
account for the power factor because it is made up of a series of
pure sinusoids.
Note that the input bandwidth of the analog inputs is 7 kHz at
the nominal internal oscillator frequency of 450 kHz.
AD71056