NI PXI-5404
CLOCK Out
CLOCK out provides the clock output. The maximum output levels on this connector depend on the type of load termination. If the CLOCK out of the NI PXI-5404 terminates into a high-impedance load (HiZ), you can configure the output levels with the software to 5 V, 3.3 V, or 1.8 V, as shown in the following figure. Therefore, the maximum level is 5 V.
If the CLOCK out of the NI PXI-5404 terminates into a 50 Ω load, the output levels are 2.5 V, 1.65 V, or 0.9 V. Thus, the maximum level you can obtain is 2.5 V. If the output terminates into any other load, the levels are as follows:
Vout = [ RL / (RL + RO) ] × 5 V
where
Vout is the maximum output voltage level.
RL is the load impedance in ohms.
RO is the output impedance on the NI PXI-5404 and is equal to 50 Ω.
By default, the CLOCK out is set to 5 V into HiZ, but you can use software to set it to 3.3 V or 1.8 V into HiZ.
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Note Software sets the voltage output levels assuming a HiZ load termination. |