NI 5421 Specifications
14
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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
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
µ
Hz
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