CDB5484U
1.6
Typical Sensor Connections
The CDB5484U evaluation board provides connections directly to different types of sensors. Flexible on-
board filter networks provide a convenient configuration for three common transducers: current shunt, cur-
rent transformer (CT), or Rogowski coil.
1.6.1
Shunt Power Meter Example
An inexpensive current shunt configuration is easily achievable with the CDB5484U evaluation board.
Figure 6 depicts the voltage and current connections for a shunt sensor and its associated filter configu-
rations.
It is strongly recommended that a low-side (neutral path) current shunt is used, especially in high-voltage
situations. Make sure that all signals are well connected before the power source is turned on. Extreme
care should be taken when connecting high-voltage signals to the CDB5484U evaluation board.
In this configuration it is unnecessary to use a burden resistor. A single anti-alias filter is all that is required
for the current channel. Below the filter corner frequency, the CS5484 inputs will see the same voltage
that is across the shunt. Therefore the shunt voltage should be kept below the maximum of 50mVp with
I-Channel PGA = 50x. A 10% margin is recommended for the shunt voltage (45mVp).
CDB5484U
J46/J52
J8/J14
R2/R22
100
R50/R53 1K
J1/J12
IIN1+/IIN2+
IIN1-/IIN2-
NO POP
R13/R24
GND
IIN1+/IIN2+
IIN1-/IIN2-
GND
0.033UF
C6/C12
0.033UF
C5/C11
0.033UF
C35/C2
0.033UF
C34/C1
J54/J55
J53/J56
SHUNT
NO POP
R11/R22
J7/J13
NO POP
R9/R23
100
R1/R21
R49/R52 1K
J44/J51
J45/J47
J6/J10
J4/J5
LINE1/LINE2
GND
VIN1+/VIN2+
VIN1-/VIN2-
R5/R10
1K
0.027UF
C4/C8
0.027UF
C9/C7
J11/J9
Figure 6. Shunt Sensor Power Meter
12
DS919DB5
CIRRUS [ CIRRUS LOGIC ]
