Appendix A
Specifications
©
National Instruments Corporation
A-5
NI PXI-6682 Series User Manual
PXI_STAR Trigger Characteristics (NI PXI-6682 only)
PXI_STAR<0..12> to
PXI_STAR<0..12> output skew
at NI PXI-6682 backplane connector..... <400 ps
1
Asynchronous delays, t
pd
PXI_STAR<0..12> to
PFI<0..2> output ............................. 11 ns, typical
PXI_STAR<0..12> to
PXI_TRIG<0..7> output ................. 22 to 36 ns, typical
PXI Trigger Characteristics
PXI_TRIG<0..7> to
PXI_TRIG<0..7> output skew
at NI PXI-6682 backplane connector..... <5 ns, typical
Asynchronous delay, t
pd
PXI_TRIG<0..7> to
PFI<0..2> output ............................. 18 to 34 ns, typical
Timestamping and Time-Synchronized Clock Generation
Time-sychronized
clock frequency range ............................ DC to 1.5 MHz
Duty cycle .............................................. Programmable
Note
Clock signals generated on PFI, PXI_STAR (NI PXI-6682 only), or PXI Trigger
lines must have a period and duty cycle that is a multiple of 10 ns.
Minimum pulse width
for timestamping .................................... 36 ns
TCXO Characteristics
Frequency............................................... 10 MHz
Initial accuracy ....................................... ±1 ppm
1
This specification applies to all asynchronous routes from the PFI inputs to the PXI_STAR lines.
