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Chapter 4 Signal Connections
PCI-4451/4452 User Manual 4-4
©
National Instruments Corporation
Table 4-2.
Analog I/O Signal Summary
Signal Name
Signal
Type and
Direction
Impedance
Input/
Output
Protection
(Volts)
On/Off
Source
(mA at V)
Sink
(mA at
V)
Rise
Time
(ns)
Bias
+ACH<0..3>
AI
1 MΩ
in parallel
with
50 pF to
AIGND
±42.4 V/±42.4 V
†
— — —
±100 pA
−
ACH<0..3>
AI
1 MΩ
in parallel
with
50 pF to
AIGND
±42.4 V/±42.4 V
†
— — —
±100 pA
AIGND
AI — — — — — —
+DAC0OUT
AO
22 Ω to
−
DAC0OUT,
4.55 kΩ to
AOGND
Short-circuit to
−
DAC0OUT,
ground
16.7 mA at
10 V
— — —
−
DAC0OUT
AO
22 Ω to
+DAC0OUT,
4.55 kΩ to
AOGND
Short-circuit to
+DAC0OUT,
ground
16.7 mA at
10 V
— — —
+DAC1OUT
AO
22 Ω to
−
DAC1OUT,
4.55 kΩ to
AOGND
Short-circuit to
−
DAC1OUT,
ground
16.7 mA at
10 V
— — —
−
DAC1OUT
AO
22 Ω to
+DAC1OUT,
4.55 kΩ to
AOGND
Short-circuit to
+DAC1OUT,
ground
16.7 mA at
10 V
— — —
AOGND
AO — — — — — —
DGND
DIO — — — — — —
+5 V
DO
0.7 Ω Short-circuit to
ground
0.5A
— — —
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
User.book Page 4 Tuesday, April 14, 1998 10:20 AM