Chapter 4
Connecting the Signals
©
National Instruments Corporation
4-7
Table 4-3.
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..63>
AI
100 G
Ω
in parallel
with
100 pF
±25/15
—
—
—
±200 pA
AISENSE,
AISENSE2
AI
100 G
Ω
in parallel
with
100 pF
±25/15
—
—
—
±200 pA
AIGND
AO
—
—
—
—
—
—
DAC0OUT
AO
0.1
Ω
Short-circuit
to ground
5 at 10
5 at –10
20
V/
µ
s
—
DAC1OUT
AO
0.1
Ω
Short-circuit
to ground
5 at 10
5 at –10
20
V/
µ
s
—
EXTREF
AI
10 k
Ω
±25/15
—
—
—
—
AOGND
AO
—
—
—
—
—
—
DGND
DO
—
—
—
—
—
—
V
CC
DO
0.1
Ω
Short-circuit
to ground
1A at 5
—
—
—
DIO<0..7>
DIO
—
V
CC
+ 0.5
13 at
(V
CC
– 0.4)
24 at
0.4
1.1
50 k
Ω
pu
SCANCLK
DO
—
—
3.5 at
(V
CC
– 0.4)
5 at 0.4
1.5
50 k
Ω
pu
EXTSTROBE*
DO
—
—
3.5 at
(V
CC
– 0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI0/TRIG1
AI
DIO
10 k
Ω
±35
V
CC
+ 0.5
3.5 at
(V
CC
– 0.4)
5 at 0.4
1.5
9 k
Ω
pu
and
10 k
Ω
pd
PFI1/TRIG2
DIO
—
V
CC
+ 0.5
3.5 at
(V
CC
– 0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI2/CONVERT*
DIO
—
V
CC
+ 0.5
3.5 at
(V
CC
– 0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI3/GPCTR1_SOURCE
DIO
—
V
CC
+ 0.5
3.5 at
(V
CC
– 0.4)
5 at 0.4
1.5
50 k
Ω
pu
PFI4/GPCTR1_GATE
DIO
—
V
CC
+ 0.5
3.5 at
(V
CC
– 0.4)
5 at 0.4
1.5
50 k
Ω
pu