Cirrus Logic CDB5490U - Manual (Page 7)

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
NEU
TRA
L
LI
N
E
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 422k    1k +
----------------------------------------
1
1689
------------- =
300Vrms
250mVp
2
----------------------- 1689  =