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Chapter 4
Connecting Signals
Signal
Type and
Signal Name
Direction
ACH<0..3>+
ACH<0..3>–
Differential Pair
ACH<0..3>+ to
ACH<0..3>–
DAC0OUT
DAC1OUT
Applies to range ≤
±
1
10 V, impedance refers to ACH<0..3>–.
±
2
Applies to range >
10 V, impedance refers to ACH<0..3>–.
Signal Name
VCC
DIO<0..7>
SCANCLK
EXTSTROBE*
PFI0/TRIG1
PFI1/TRIG2
PFI2/CONVERT*
NI 6115/6120 User Manual
Table 4-4. Analog I/O Summary for the NI 6120
Impedance
Input/
Output
AI
100 GΩ
to GND
AI
100 GΩ
to GND
AI
1 MΩ in parallel
1
with 100 pF
or
10k in parallel
2
with 40 pF
50 Ω
AO
50 Ω
AO
Table 4-5. Digital I/O Signal Summary
Signal
Impedance
Type and
Input/
Direction
Output
0.1 Ω
DO
DIO
—
DO
—
DO
—
AI
10 kΩ
DIO
DIO
—
DIO
—
Protection
(Volts)
Source
On/Off
(mA at V)
±42 V to
—
GND
±42 V to
—
GND
—
—
Short-circuit
5 at 10
to ground
Short-circuit
5 at 10
to ground
Protection
(Volts)
Source
On/Off
(mA at V)
Short-circuit
1 A
to ground
V
+0.5
13 at
CC
(V
–0.4)
CC
—
3.5 at
(V
–0.4)
CC
—
3.5 at
(V
–0.4)
CC
±35
3.5 at
V
+0.5
(V
–0.4)
CC
CC
V
+0.5
3.5 at
CC
(V
–0.4)
CC
V
+0.5
3.5 at
CC
(V
–0.4)
CC
4-6
Rise
Sink
Time
(mA at V)
(ns)
Bias
—
—
±300 pA
—
—
±200 pA
—
—
±300 pA
5 at –10
—
5 at –10
—
Rise
Sink
Time
(mA at V)
(ns)
—
—
24 at 0.4
1.1
50 kΩ
pu
5 at 0.4
1.5
50 kΩ
pu
5 at 0.4
1.5
50 kΩ
pu
5 at 0.4
1.5
9 kΩ
pu and
10 k
pd
5 at 0.4
1.5
50 kΩ
pu
5 at 0.4
1.5
50 kΩ
pu
—
—
Bias
—
Ω
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