I/O Connectors - National Instruments NI 4472 User Manual

Chapter 3 Device Overview and Theory of Operation
EXT Digital Trigger
INPUT/CAL
CH0
MUX
INPUT/CAL
CH1
MUX
INPUT/CAL
CH7
MUX
INPUT/CAL
MUX Control

I/O Connectors

Connections that exceed any of the maximum ratings for input signals on
Caution
the NI 4472 can damage the device, the computer, and the associated accessories.
National Instruments is not liable for any damage resulting from such signal connections.
NI 4472 User Manual
AC/DC
LP Filter
Coupling
AC/DC
LP Filter
Coupling
To
To
CH<0..6>
CH<0..6>
AC/DC
LP Filter
Coupling
Coupling
Control
Figure 3-2. Analog Function Block Diagram
The front panel of the NI 4472 has nine SMB male connectors for attaching
signal inputs.
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 TTL and CMOS voltage levels.
CH<0..7> are analog input channels 0 through 7. 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 analog input channel circuit
Serial/IO Hardware Linear
ADC0
Parallel
Serial/IO Hardware Linear
ADC1
Parallel
To
To
CH<0..6>
CH<0..6>
Serial/IO Hardware Linear
ADC7
Parallel
From DDS
Correction
Control
3-2
To
FIFO
Correction
To
FIFO
Correction
To
FIFO
Correction
Trigger Digital
Control Overrange
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