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AN2317 Datasheet(PDF) 12 Page - STMicroelectronics

Part # AN2317
Description  Energy Metering IC External Circuits
PDF  27 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2317 Datasheet(HTML) 12 Page - STMicroelectronics

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External Circuit Design
AN2317 - Application
12/27
The anti-aliasing filter magnitude and phase response can be calculated as follows:
Equation 10
Note:
The cutoff frequency is expressed as:
So
Equation 10 can be changed to:
Equation 11
Equation 12
The phase is expressed as:
Equation 13
In the module:
R = 2 • 103K
Ω and
C = 10nF, so then
A
u
U
O
U
I
--------
1
j
ωc
---------
R
1
j
ωc
---------
+
--------------------
1
1j
ωRC
+
-------------------------
==
=
f
p
1
2
πτ
---------
1
2
πRC
----------------
==
A
u
1
1j
f
f
p
----
⋅
+
--------------------
1
1j
f
f
p
----
⋅
+
--------------------
==
A
u
1
1
f
f
p
----
⎝⎠
⎛⎞ 2
+
----------------------
=
ϕ
arc
–
f
f
p
----
tan
=
f
p
1
2
πRC
----------------
7961.8Hz
==



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