
CDB5490U
DS923DB5 7
The default attenuation network provides the following attenuation:
With the CS5490 input range of 250mVp at maximum AC line input of:
is acceptable. It is recommended to apply a 10% margin for the AC line input (270Vrms).
The CDB5490U evaluation board provides input shorting options for calibration and noise performance
measurements. With a jumper on J6 and J11 in the GND position, the inputs are connected to analog
ground (GND).
GND
LINE
CS5490
CDB5490U
NEUTRAL
LINE
J4
J11
J6
R5
1K
C9
0.027UF
C4
0.027UF
R7
1K
R6
1K
R8
422K
R12
422K
R14
422K
R15
422K
J45
VIN-
VIN+
Figure 3. Voltage Channel — High-voltage Input
1k
4 422k1k+
----------------------------------------
1
1689
-------------
=
300Vrms
250mVp
2
-----------------------
1689=
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