Chapter2 HardwareOverview
NIPXI-562x User Manual 2-8 ni.com
Synchronizing Multiple PXI Devices
TheNI 562xuses a PLL to synchroni zeth e6 4 MHz sample clock to a
10 MHz reference clock. You can either supply the reference clock through
the SMA connector (REF CLK IN) on the front panel or use the system
reference clockon the PXI backplane.
The PXI busand th e NI 562xhavethe following timing and trigger ing
features that you can use for synchronizing multiple digitizers:
•SystemReference Clock—A1 0 MHz clock on the PXI backplane
with ±100 ppmaccuracy. It is independently distributed to each PXI
peripherals lot through equal-length traces with a skewof less than
1 ns between slots. Multiple devicescan use this common timebase for
synchronization,w hich allowseach NI 562xto phase lock to the
systemreference clock.
•SMA connector (REF CLK IN)—A 10 MHz reference input that you
can uset o connect an external frequencysource for synchronizatio n.