Can the PXI-565x be Used as a Clock for the PXI-6562? Hardware: Digital I/O (DIO)>>High-Speed>>PXI-6562
Problem: I would like to use an external clock for my NI HSDIO PXI-6562. The clock frequency is greater than the PXI-5404 can provide (105 MHz). Since the PXI-565x can generate a sine wave at the required rate, can I use this signal for the clock of my PXI-6562? Solution: The HSDIO cards can use a sine wave as a clock assuming the frequency and peak to peak voltage fall within the specifications. For a sine wave with a frequency greater than 5.5 MHz, the peak to peak voltage must be between 0.65 to 5.0 V. The voltage of the signal generated by the PXI-565x will be dependant on the load. Since the 656x has a 50 ohm load (see the 656x Specifications) the voltage output of the PXI-565x can be found by: VoltagePtoP = 0.316*10power/20 The maximum power of the 565x is 10 dBm. This gives us, VoltagePtoP = 0.316*10(10/20) = ~1 V A 1 V sine wave meets the specifications for the 656x clock, so we can use the PXI-565x as the clock for a 656x device. Related Links: KnowledgeBase 41SI2DJQ: External Clocking for HSDIO Devices Attachments:
Report Date: 12/13/2006 Last Updated: 01/18/2007 Document ID: 44C9FHVB |
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