National Instruments NI PXI-562X User Manual

Contents

National Instruments NI PXI-562X User Manual Manual pdf 19 page image

Chapter 2 Hardware Overview© National Instruments Corporation 2-5 NI PXI-562x User ManualBlock DiagramThe block diagram below illustrates the operation of the NI 562x.An explanation of some of these features follows.Figure 2-3. NI 562x Block DiagramThe digital downconverter is a digital signal processor (DSP) that allowsyou to digitally zoom in on data, which reduces the amount of datatransferred into memory and speeds up the rate of data transfer. The digitaldownconverter performs frequency-translation, filtering, and decimationafter signals go through the ADC. Refer to the Incorporating the DDCsection for more information.The PLL uses a phase detector to synchronize the acquisition clock to eithera 10 MHz reference clock supplied through REF CLK IN or to the CLK 10signal from the PXI backplane. You can also leave the acquisition clock inTIO(Timing and Control)DigitalDownconverterVoltageControlledOscillatorPXIData PathLogicOnboardMemoryFilter MITE(PXI Interface)ADCDither+AnalogInput(INPUT)Trigger andClock Routing10 MHzReferenceInput(REF CLK IN)EXT TRIG(PFI)External Trigger PXI TriggerCLK 10PhaseDetectorCalDACPLL