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Chapter 4
Signal Connections
Type and
Signal Name
Direction
+ACH<0..3>
ACH<0..3>
AIGND
+DAC0OUT
DAC0OUT
+DAC1OUT
DAC1OUT
AOGND
DGND
+5 V
AI = Analog Input
DIO = Digital Input/Output
AO = Analog Output
DO = Digital Output
†
±400 V/±400 V guaranteed by design, but not tested or certified to operate beyond ±42.4 V
PCI-4451/4452 User Manual
Table 4-2. Analog I/O Signal Summary
Signal
Impedance
Input/
Output
1 M
AI
in parallel
with
50 pF to
AIGND
1 M
AI
in parallel
with
50 pF to
AIGND
AI
—
22
to
AO
DAC0OUT,
4.55 k to
AOGND
22
to
AO
+DAC0OUT,
4.55 k to
AOGND
22
to
AO
DAC1OUT,
4.55 k to
AOGND
22
to
AO
+DAC1OUT,
4.55 k to
AOGND
AO
—
DIO
—
0.7
DO
Protection
(Volts)
Source
On/Off
(mA at V)
†
±42.4 V/±42.4 V
—
†
±42.4 V/±42.4 V
—
—
—
Short-circuit to
16.7 mA at
10 V
DAC0OUT,
ground
Short-circuit to
16.7 mA at
+DAC0OUT,
10 V
ground
Short-circuit to
16.7 mA at
10 V
DAC1OUT,
ground
Short-circuit to
16.7 mA at
+DAC1OUT,
10 V
ground
—
—
—
—
Short-circuit to
0.5A
ground
4-4
Sink
Rise
(mA at
Time
V)
(ns)
Bias
±100 pA
—
—
±100 pA
—
—
—
—
—
—
—
—
—
—
—
—
—
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© National Instruments Corporation
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