Analog Section; Figure 2. Voltage Channel - Low-Voltage Input - Cirrus Logic CDB5480U General Description Manual

1.3

Analog Section

The analog section of the CDB5480U is highly configurable. Onboard signal conditioning options for the
voltage and current channels enable most applications to interface directly to the sensors. The following
two sections define the voltage and current channels configurations.
1.3.1 Voltage Sensor Connection
There are three input signal options for the voltage channel input (VIN±): an external low-voltage signal
(via screw terminals or XLR connections), high-voltage line input, or GND. Table 1 illustrates the options
available.
High Voltage
The CDB5480U evaluation board provides screw-type terminals (J3) or XLR connectors (J30) to connect
the low-voltage input signal to the voltage channel (see Figure 2). The screw terminals are labeled as
VIN+ / VIN-. An R-C network at the channel input provides a simple configurable anti-alias filter. By
installing jumpers on J6 to position VIN+ and J11 to position VIN-, the input voltage signal is supplied from
the screw terminals or XLR connection.
250 mVp
DS893DB5
Table 1. Voltage Channel Input Signal Selection
INPUT Description
Selects External
VIN± Low-voltage Fully
Differential Signal
Selects External
VIN± Low-voltage Sin-
gle-ended Signal
Selects Grounding
GND
the Input
Selects External
High-voltage AC
Line
Line Signal
CDB5480U
J3
VIN+
VIN-
J11
Figure 2. Voltage Channel — Low-voltage Input
J11
O

VIN- VIN-
O O
GND
VIN-
(Default)
 O
VIN- VIN-
O O
GND
VIN-
O

VIN- VIN-
O O
GND VIN-
O

VIN- VIN-
O O
GND VIN-
J45
J6
CDB5480U
J6
O
 
GND
VIN+
O O
Line
VIN+
O O
VIN+
VIN+
(Default)
  O
GND
VIN+
O O
Line
VIN+
O O
VIN+
VIN+
O
 
GND VIN+
O O
Line VIN+
O O
VIN+ VIN+
O
 
GND VIN+
O O
Line VIN+
O O
VIN+ VIN+
VIN+
C4
0.027UF
CS5480
C9
0.027UF
VIN-
5