I/O Connectors - National Instruments NI 447 Series User Manual

Chapter 3 Device Overview and Theory of Operation
EXT Digital Trigger
INPUT/CAL
CH0
MUX
INPUT/CAL
CH1
MUX
INPUT/CAL
CH n
MUX
INPUT/CAL
MUX Control

I/O Connectors

Connections that exceed any of the maximum ratings for input signals on
Caution
the NI 447X can damage the device, the computer, and the associated accessories.
NI is not liable for any damage resulting from such signal connections.
NI 447X User Manual
AC/DC
LP Filter
Coupling
AC/DC
LP Filter
Coupling
To
To
CH<0.. n– 1>
CH<0.. n– 1>
AC/DC
LP Filter
Coupling
Coupling
Control
The front panel of the NI PCI/PXI-4472 has nine SMB male connectors,
and the front panel of the NI PCI-4474 has five SMB male connectors.
These connectors are used for attaching analog and digital signals.
The EXT TRIG connector is the input for the PFI0/EXT_TRIG signal.
Triggers cannot be output from the EXT TRIG connector. The EXT TRIG
line is compatible with 5V TTL and CMOS voltage levels.
CH<0..n> are AI channels 0 through n. Input impedance on the positive
(signal) wire of each input channel is 1 MΩ in parallel with 60 pF to
ground. Input impedance on the negative (shield) wire is 50 Ω in parallel
with 0.02 µF to ground. The signal line of each AI channel circuit is
protected to ±42.4 V, whether power is on or off. The shield side of the
Serial/IO
ADC0
Parallel
Serial/IO
ADC1
Parallel
To
CH<0.. n– 1>
CH<0.. n– 1>
Serial/IO
ADC n
Parallel
From DDS
Correction
Control
Figure 3-2. Analog Function Block Diagram
3-2
Hardware Linear
Correction
Hardware Linear
Correction
To
Hardware Linear
Correction
Trigger Digital
Control Overrange
To
FIFO
To
FIFO
To
FIFO
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