© National Instruments Corporation A-1 NI PXIe-6672 User Manual
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Specifications

CLKIN Characteristics

CLKIN fundamental
frequency range1....................................1 MHz to 105 MHz,
sine or square wave
Input impedance.....................................50 Ω, nominal
Input coupling........................................ AC
Voltage range
DC...................................................±20 V
AC...................................................400 mVp-p to 5 Vp-p
Absolute maximum input voltage2.........±26 V, max
CLKIN to PXI_CLK10_IN delay
without PLL........................................... 14 ns to 14.7 ns, typical
CLKIN to PXI_CLK10 delay
with PLL................................................ ±1 ns, max
CLKIN frequency accuracy requirement
For PLL and TCXO........................ ±5.0 ppm
For replacing PXI_CLK10
(no PLL)..........................................±100 ppm3
1 CLKIN fundamental frequency can be any multiple of 1MHz within the range specified when the PLL is engaged and
PXI_CLK10 is locking to it. The frequency must be 10MHz when replacing PXI_CLK10 without the PLL.
2 Stresses beyond those listed can cause permanent damage to the device. Exposure to absolute maximum rated conditions for
extended periods of time can affect device reliability. Functional operation of the device outside the conditions indicated in
the operational parts of the specification is not implied.
3 This is a requirement of the PXI specification.