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NI 5421 Specifications 14 ni.com
Sample Clock
Table 2.
Specification Value Comments
Sources 1. Internal, Divide-by-N (N ≥ 1)
2. Internal, DDS-based, High-Resolution
3. External, CLK IN (SMB front panel connector)
4. External, DDC CLK IN (DIGITAL DATA &
CONTROL front panel connector)
5. NI PXI-5421: External, PXI Star trigger
(backplane connector)
6. NI PXI-5421: External, PXI_Trig<0..7>
(backplane connector)
NI PCI-5421: External, RTSI<0..7>
Refer to the
Onboard Clock
section for more
information
about Internal
Clock Sources.
Sample Rate Range and Resolution
Sample Clock
Source
Sample Rate Range Sample Rate Resolution
—
Divide-by-N 23.84 S/s to 100 MS/s Settable to (100 MS/s) / N
(1 ≤ N ≤ 4,194,304)
High
Resolution
10 S/s to 100 MS/s 1.06 µHz
CLK IN 200 kS/s to 105 MS/s Resolution determined by
external clock source.
External Sample Clock duty
cycle tolerance 40% to 60%.
DDC CLK IN 10 S/s to 105 MS/s
NI PXI-5421
PXI Star
Trigger
10 S/s to 105 MS/s
NI PXI-5421
PXI_Trig<0..7>
10 S/s to 20 MS/s
NI PCI-5421
RTSI<0..7>
10 S/s to 20 MS/s