© National Instruments
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2-9
I/O Connector Signal Descriptions
Table 2-2 describes the signals found on the I/O connector.
PXIe-4340 Block Diagram
Figure 2-8 shows the block diagram of the PXIe-4340. The analog signal conditioning for each
channel consists of a lowpass filter for each input and remote sense channel. Each conditioned
signal is then digitized by a dedicated 24-bit delta-sigma ADC to achieve simultaneous data
acquisition. After the signal is digitized, it is demodulated before being sent to software.
Table 2-2.
I/O Connector Signal Descriptions
Signal Names
Direction
Description
AIGND
—
Analog Input Ground
AI<0..3>+
Input
Positive inputs of the differential analog input
channels 0 to 3.
AI<0..3>-
Input
Negative inputs of the differential analog input
channels 0 to 3.
EX<0..3>+
Output
Positive outputs of the differential excitation
channels 0 to 3.
EX<0..3>-
Output
Negative outputs of the differential excitation
channels 0 to 3.
RS<0..3>+
Input
Positive inputs of the remote sense input channels
0 to 3.
RS<0..3>-
Input
Negative inputs of the remote sense input channels
0 to 3.
RSVD
—
These pins are reserved for communication with the
accessory.
DGND
—
Digital ground—this pin supplies the reference for
module digital signals and is connected to the module
digital ground.
PFI0
Input or Output
3.3 V digital signal for sending or receiving trigger
and synchronization signals.