National Instruments PXI Express PXIe-1085 Series, User Manual

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Appendix A Specifications
100 MHz System Reference Clock: PXIe_CLK100 and
PXIe_SYNC100
Maximum slot-to-slot skew ..............................100 ps
Accuracy ...........................................................±25 ppm max. (guaranteed over the operating
temperature range)
Maximum jitter .................................................3 ps RMS phase-jitter (10 Hz to 12 kHz range);
2 ps RMS phase-jitter (12 kHz to 20 MHz range)
Duty-factor for PXIe_CLK100.........................45% to 55%
Absolute single-ended voltage swing
(When each line in the differential pair
has 50 W termination to 1.30 V
or Thévenin equivalent) ....................................400 mV to 1000 mV
Note
For other specifications refer to the PXI-5 PXI Express Hardware
Specification .
External 10 MHz Reference Out (SMA on front panel of chassis)
Accuracy ...........................................................±25 ppm max. (guaranteed over the operating
temperature range)
Maximum jitter .................................................5 ps RMS phase-jitter (10 Hz to 1 MHz range)
Output amplitude ..............................................1 VPP ±20% square-wave into 50 Ω
2 VPP unloaded
Output impedance .............................................50 Ω ±5 Ω
External Clock Source
Frequency..........................................................10 MHz ±100 PPM
Input amplitude
Rear panel BNC ........................................200 mVPP to 5 VPP square-wave or sine-wave
System timing slot
PXI_CLK10_IN........................................5 V or 3.3 V TTL signal
Front panel SMA input impedance...................50 Ω ±5 Ω
Maximum jitter introduced
by backplane .....................................................1 ps RMS phase-jitter (10 Hz to 1 MHz range)
PXIe_SYNC_CTRL
VIH ...................................................................2.0 V to 5.5 V
VIL....................................................................0 V to 0.8 V
PXI Star Trigger
Maximum slot-to-slot skew ..............................250 ps
Backplane characteristic impedance.................65 Ω ±10%
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