National Instruments NI PXIe-6672 - Manual (Page 37)

Appendix A Specifications
NI PXIe-6672 User Manual A-2 ni.com
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%
CLKOUT Characteristics
Output frequency
From PXI_CLK10 ...........................10 MHz
From TCXO.....................................10 MHz
From DDS .......................................1 MHz 1 to 105 MHz
Duty cycle...............................................43 to 55% 2
Output impedance...................................50
Ω, nominal
Output coupling ......................................AC
Amplitude, software configurable to two voltage levels
(low and high drive)
1 The lower limit is load dependent because of the AC coupling. This limit is less than 1 MHz for high-impedance loads.
2 The duty cycle specification covers both DDS range and TCXO.
Open Load Square Wave
Low Drive 2.0 V
p-p
, typical
High Drive 5.0 V
p-p
, typical
50
Ω Load
Square Wave
Low Drive 1.0 V
p-p
, typical
High Drive 2.5 V
p-p
, typical