© National Instruments
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A-5
NI PXI-6683 Series User Manual
Timestamping and Time-Synchronized Clock
Generation
Time-sychronized
clock period and duty cycle resolution ............. 10 ns
Note
Clock signals generated on PFI, PXI_STAR (NI PXI-6683 only), or
PXI Trigger lines must have a period and duty cycle that is a multiple of 10 ns.
Minimum pulse width for timestamping .......... 22 ns
TCXO Characteristics
Nominal frequency ........................................... 10 MHz
Accuracy within 1 year of calibration
adjustment within 0 °C to 55 °C
operating temperature range ............................. ±3.5 ppm
Long-term stability ........................................... ±1 ppm/year
Stability vs temperature .................................... <2 ppm peak-to-peak
within 0 °C to 55 °C operating temperature
range
Tuning voltage range
1
....................................... 0.6 V to 3.0 V
Tuning range..................................................... ±17.5 ppm minimum
Duty cycle......................................................... 45 to 55%
Recommended calibration interval................... 1 year
1
The TCXO will operate with a tuning voltage between 0 V and 0.6 V, but the frequency curve is flat below
0.6 V.
