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A-3
NI PXI-6683 Series User Manual
Input thresholds
Voltage threshold high .............................. +2.3 V max
Voltage threshold low ............................... +0.8 V min
Asynchronous delay, t
pd
PFI<0..2> to
PXI_TRIG<0..7> output........................... 17 to 20 ns, typical
PFI<0..2> to
PXI_STAR<0..12> output
1
....................... 12 ns, typical
Synchronized trigger
input setup time, t
setup
....................................... 25 ns, max (relative to CLKOUT when
configured to route PXI_CLK10)
Synchronized trigger
input hold time, t
hold
.......................................... 0 ns (relative to CLKOUT when configured to
route PXI_CLK10)
IRIG-B Input Characteristics (PFI0)
IRIG-B AM compatibility ................................ IRIG-B 12X (200-04 standard)
Maximum Input voltage range ........................ -5 V to +5 V
Input impedance ............................................... > 5 kΩ
Decode Input voltage range ............................. 1.5 V to 10 V peak-peak mark
(3:1 ratio mark:space)
Input carrier frequency ..................................... 1 kHz
Caution
Do not connect an IRIG-B AM signal to PFI 0 when the input is
configured for digital operation, as this can result in damage of the digital input
circuitry.
IRIG-B DC compatibility ................................. IRIG-B 00X (200-04 standard)
Input characteristics for IRIG-B DC ................ same as PFI digital input characteristics listed
above
1
The NI PXI-6683H does not have star trigger lines.