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Specifications
This appendix lists the system specifications for NI PXI-665
x
modules. These specifications are
typical at 25 °C, unless otherwise stated.
Note
Specifications are subject to change without notice.
CLKIN Characteristics
CLKIN fundamental
frequency range
1
............................................... 1 MHz to 105 MHz, sine or square wave
Input impedance ............................................... 50
Ω
, nominal
Input coupling................................................... AC
Voltage range .................................................... 400 mVp-p to 5 Vp-p
Absolute maximum input voltage
2
................... 6 Vp-p, max
CLKIN to PXI_CLK10_IN delay (No PLL).... 14 ns to 14.7 ns, typical
CLKIN to PXI_CLK10
offset when using PLL...................................... ±1 ns, max
CLKIN frequency accuracy requirement
For PLL and OCXO ................................. ±1.5 ppm
For PLL and TCXO.................................. ±5.0 ppm
For replacing PXI_CLK10
(no PLL) ................................................... ±100 ppm
3
Jitter added to CLKIN
Without PLL ............................................. 0.5 ps
rms
, 10 Hz to 100 kHz, typical
With PLL .................................................. 0.6 ps
rms
, 10 Hz to 100 kHz, typical
Duty cycle distortion of CLKIN to
PXI_CLK10_IN without PLL .......................... ±1%, max
Required input duty cycle
when using PLL................................................ 45 to 55%
1
CLKIN fundamental frequency can be any multiple of 1 MHz within the range specified when the PLL is
engaged and PXI_CLK10 is locking to it. The frequency must be 10 MHz 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.
