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© National Instruments Corporation 17 NI 5441 Specifications
Onboard Clock
(Internal VCXO)
Phase-Locked Loop (PLL) Reference Clock
Specification Valu e Comments
Clock Source Internal sample clocks can either be locked to a Reference
Clock using a phase-locked loop or be derived from the
onboard VCXO frequency reference.
—
Frequency
Accuracy
±25 ppm —
Specification Valu e Comments
Sources 1. PXI_CLK10 (backplane connector)
2. CLK IN (SMB front panel connector)
The PLL
Reference Clock
provides the
reference
frequency for the
PLL.
Frequency
Accuracy
When using the PLL, the Frequency Accuracy of the
NI 5441 is solely dependent on the Frequency Accuracy
of the PLL Reference Clock Source.
—
Lock Time Typical: 70 ms.
Maximum: 200 ms.
—
Frequency
Range
5 MHz to 20 MHz in increments of 1 MHz.
Default of 10 MHz.
The PLL Reference Clock Frequency has to be accurate
to ±50 ppm.
—
Duty Cycle
Range
40% to 60% —
Exported PLL
Reference
Clock
Destinations
1. PFI<0..1> (SMB front panel connectors)
2. PXI_Trig<0..7> (backplane connector)
—