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© National Instruments

|

3-15

NI PXI-665x User Manual

Using Front Panel PFIs As Inputs

The front-panel PFIs can receive external signals from 0 to +5 V. The input impedance of PFI 
inputs can be programmatically set to 10 k

Ω

 or 50

Ω

 , to match the cable impedance and 

minimize reflections.

Note

Terminating the signals with a 50

Ω

resistance is recommended when the 

source is another NI PXI-665

x

 or any other source with a 50

Ω

 output.

The voltage thresholds for the front-panel PFI inputs are programmable. The input signal is 
generated by comparing the input voltage on the PFI connectors to the voltage output of 
software-programmable DACs. The thresholds for the PFI lines are individually programmable, 
which is useful if you are importing signals from multiple sources with different voltage swings. 
The front panel PFI inputs can be routed to any PXI star triggers, PXI/RTSI triggers, or other 
front panel PFI outputs.

Using Front Panel PFIs As Outputs

The front panel PFI outputs are +3.3 V drivers with 50

Ω

 output impedance. The outputs can 

drive high-impedance loads or 50

Ω

 loads, such as a 50

Ω

 coaxial cable with a 50

Ω

 receiver. 

When driving a high-impedance load, the receiver sees a +3.3V signal. When driving a 50

Ω

 

load the receiver sees a 1.6 V step—a +3.3 V step split across the 50

Ω

 resistors at the 

source and the destination. This cable configuration is the recommended setup to minimize 
reflections.

You can independently select the output signal source for each PFI line from one of the following 
sources:
•

Another PFI <0..5>

•

PXI/RTSI triggers <0..7> (PXI_TRIG <0..7>)

•

PXI_STAR <0..12>

•

Global software trigger

•

PFI synchronization clock

The PFI synchronization clock may be any of the following signals:
•

DDS clock

•

PXI_CLK10

•

PFI 0 Input

•

Any of the previously listed signals divided by the first frequency divider (2

n

, up to 512)

•

Any of the previously listed signals divided by the second frequency divider (2

m

, up to 512)

Refer to the 

Choosing the Type of Routing

 section for more information on the synchronization 

clock.

Содержание NI PXI-665 Series

Страница 1: ...PXI NI PXI 665x User Manual Timing and Synchronization Module for PXI NI PXI 665x User Manual February 2016 370711D 01...

Страница 2: ...port phone numbers email addresses and current events National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin Texas 78759 3504 USA Tel 512 683 0100 For further support informat...

Страница 3: ...ESS FOR A PARTICULAR PURPOSE TITLE OR NON INFRINGEMENT AND ANY WARRANTIES THAT MAY ARISE FROM USAGE OF TRADE OR COURSE OF DEALING NI DOES NOT WARRANT GUARANTEE OR MAKE ANY REPRESENTATIONS REGARDING TH...

Страница 4: ...es independent from National Instruments and have no agency partnership or joint venture relationship with National Instruments Patents For patents covering National Instruments products technology re...

Страница 5: ...e encouraged to try to correct the interference by one or more of the following measures Reorient the antenna of the receiver the device suffering interference Relocate the transmitter the device gene...

Страница 6: ...2 Front Panel 3 5 NI PXI 6651 Front Panel 3 6 Access LED 3 7 Active LED 3 7 Connectors 3 8 Hardware Features 3 9 Clock Generation 3 10 Direct Digital Synthesis DDS 3 10 PXI_CLK10 and OCXO or TCXO 3 11...

Страница 7: ...libration Factory Calibration 4 1 OCXO Frequency 4 1 TCXO Frequency 4 1 PXI_CLK10 Phase 4 1 DDS Start Trigger Phase 4 1 DDS Initial Phase 4 2 Additional Information 4 2 Appendix A Specifications Appen...

Страница 8: ...g your hardware and software Use the documentation you have as follows Measurement hardware documentation This documentation contains detailed information about the measurement hardware that plugs int...

Страница 9: ...use the NI PXI 665x you need the following items NI PXI 665x Timing and Triggering Module NI PXI 665x User Manual NI VISA software NI Sync software One of the following software packages and documenta...

Страница 10: ...ther ADEs such as Visual C C LabVIEW features interactive graphics a state of the art interface and a powerful graphical programming language The LabVIEW Data Acquisition VI Library a series of virtua...

Страница 11: ...wer from signal lines before connecting them to or disconnecting them from the product Operate the product at or below the measurement category1 marked on the hardware label Measurement circuits are s...

Страница 12: ...n hard wired hardware such as hardware in fixed installations distribution boards and circuit breakers Other examples are wiring including cables bus bars junction boxes switches socket outlets in the...

Страница 13: ...he chassis 2 Choose an available PXI slot in the PXI chassis Note The PXI_STAR and PXI_CLK10_IN signals are only available in the System Timing Slot Slot 2 3 Remove the filler panel for the PXI slot y...

Страница 14: ...665x is completely software configurable The system software automatically allocates all module resources The two LEDs on the front panel provide information about module status The front panel descri...

Страница 15: ...pter presents an overview of the hardware functions of the NI PXI 6653 NI PXI 6652 and NI PXI 6651 Figure 3 1 provides a functional overview of the NI PXI 6653 and NI PXI 6652 hardware Figure 3 2 prov...

Страница 16: ...PXI_CLK10_IN OCXO Calibration DAC OCXO Clock PXI_CLK10 DDS Clock PFI 0 Threshold DAC PFI 0 Driver Comparator PFI 1 Driver Comparator PFI 2 Driver Comparator PFI 3 Driver Comparator PFI 4 Driver Compar...

Страница 17: ...re 3 2 Functional Overview of the NI PXI 6651 CLOCK and TRIGGER Routing PCI Interface PXI PCI PXI_TRIG 0 7 CLKIN AC Coupled Clock Detector PXI_CLK10_IN PFI 0 Driver Comparator PFI 1 Driver Comparator...

Страница 18: ...he connectors and LEDs on the front panel of the NI PXI 6653 Figure 3 3 NI PXI 6653 Front Panel 1 Access LED 2 Active LED 3 CLKOUT Connector 4 CLKIN Connector 5 PFI 0 5 Connectors NI PXI 6653 Timing M...

Страница 19: ...hows the connectors and LEDs on the front panel of the NI PXI 6652 Figure 3 4 NI PXI 6652 Front Panel 1 Access LED 2 Active LED 3 CLKOUT Connector 4 CLKIN Connector 5 PFI 0 5 Connectors 2 1 3 4 5 CLK...

Страница 20: ...nt Panel Figure 3 5 shows the connectors and LEDs on the front panel of the NI PXI 6651 Figure 3 5 NI PXI 6651 Front Panel 1 Access LED 2 Active LED 3 CLKIN Connector 4 PFI 0 1 Connectors 1 3 4 2 NI P...

Страница 21: ...er is helpful when you want to identify devices in a multichassis situation or when you want an indication that your application has reached a predetermined section of the code Table 3 2 illustrates t...

Страница 22: ...cally from the oven controlled crystal oscillator OCXO or temperature compensated crystal oscillator TCXO direct digital synthesis DDS or backplane clock PXI_CLK10 PFI 0 5 Programmable Function Interf...

Страница 23: ...ck By default this signal is the output of the native 10 MHz oscillator in the chassis An NI PXI 665x in Slot 2 can replace this signal with PXI_CLK10_IN OCXO Clock NI PXI 6653 or TCXO Clock NI PXI 66...

Страница 24: ...word is added to the accumulator which rolls over when it gets to its maximum value The accumulator value is used to get a point in the sine lookup table which is converted to an analog voltage by th...

Страница 25: ...sely controlled operating temperature for the oscillator This temperature control scheme minimizes frequency error to low enough levels that other sources of error become considerable The user can do...

Страница 26: ...oftware The OCXO or TCXO output also can be routed out to the CLKOUT connector In addition to replacing the native backplane clock directly the OCXO or TCXO can phase lock to an external frequency sou...

Страница 27: ...I 0 DDS PXI_CLK10 2N 2M 2N 2M Selection Circuitry Selection Circuitry Selection Circuitry Selection Circuitry Selection Circuitry Selection Circuitry Selection Circuitry Selection Circuitry Selection...

Страница 28: ...t A in a cell indicates that the source and destination combination defined by that cell is a valid routing combination Table 3 4 Sources and Destinations for NI PXI 665x Signal Routing Operations Des...

Страница 29: ...I outputs Using Front Panel PFIs As Outputs The front panel PFI outputs are 3 3 V drivers with 50 output impedance The outputs can drive high impedance loads or 50 loads such as a 50 coaxial cable wit...

Страница 30: ...igger Bus PXI star triggers and PXI_CLK10 are PXI features that enhance synchronization The PXI trigger bus is a multi drop 8 line bus that goes to every slot The PXI star trigger bus is a set of up t...

Страница 31: ...n introduce signal integrity issues Therefore National Instruments does not recommend the use of PXI_Trigger lines for clock distribution The preferred method for clock distribution is the use of the...

Страница 32: ...PXI_Trig PXI_Star synchronization clock CLKIN Refer to the Using the PXI RTSI Triggers section for a list of possible sources for the synchronization clock for PXI Star trigger outputs Note The PXI_T...

Страница 33: ...chronous routing operation on the NI PXI 665x can be any of the following lines Any front panel PFI pin PFI 0 5 Any PXI star trigger line PXI_STAR 0 12 Any PXI RTSI trigger line PXI_TRIG 0 7 Synchrono...

Страница 34: ...igh state within a window of time around the clock edge This window of time around the clock edge is defined by the setup time tsetup and hold time thold If the input signal changes within this window...

Страница 35: ...ces for synchronous routing include the following sources Any front panel PFI pin Any PXI star trigger line PXI_STAR 0 12 Any PXI RTSI trigger line PXI_TRIG 0 7 Global software trigger The synchroniza...

Страница 36: ...ion The first option is to replace PXI_CLK10 directly with the OCXO output on the NI PXI 6653 or TCXO output on the NI PXI 6652 This oscillator is a more stable and accurate reference than the native...

Страница 37: ...becomes disconnected PXI_CLK10 is still present in the chassis If CLKIN is 10 MHz the NI PXI 6653 or NI PXI 6652 can compensate for distribution delays in the backplane The feedback in the PLL comes f...

Страница 38: ...ctions OCXO Frequency The OCXO frequency can be varied over a small range The output frequency of the OCXO is adjusted using this constant to meet the specification listed in Appendix A Specifications...

Страница 39: ...The phase of the DDS output is adjusted using this constant so that the DDS outputs from multiple NI PXI 6653 or NI PXI 6652 modules are aligned Additional Information Refer to ni com calibration for...

Страница 40: ...0 ppm For replacing PXI_CLK10 no PLL 100 ppm3 Jitter added to CLKIN Without PLL 0 5 psrms 10 Hz to 100 kHz typical With PLL 0 6 psrms 10 Hz to 100 kHz typical Duty cycle distortion of CLKIN to PXI_CL...

Страница 41: ...ctable Input coupling DC Voltage level 0 V to 5 V Absolute maximum input voltage2 5 25 V max 1 The lower limit is load dependent because of the AC coupling This limit is less than 1 MHz for high imped...

Страница 42: ...48 mA max Synchronized trigger clock to out time tCtoQ 1 8 4 ns typical Output to output skew synchronous 500 ps typical PXI_STAR Trigger Characteristics PXI_STAR 0 12 to PXI_STAR 0 12 output skew at...

Страница 43: ...kHz typical Recommended calibration interval 1 year TCXO Characteristics Nominal frequency 10 MHz Accuracy within 1 year of calibration adjustment within 0 C to 55 C operating temperature range 3 5 p...

Страница 44: ...00 m CLKOUT High Gain 105 MHz1 100 m PFI CLKOUT Low Gain 105 MHz1 30 m Power Requirements 5 V 2 A max 3 3 V 600 mA max 12 V 500 mA max 12 V 0 A max Environmental Operating Environment Ambient temperat...

Страница 45: ...grms Nonoperating 5 to 500 Hz 2 4 grms Tested in accordance with IEC 60068 2 64 Nonoperating test profile exceeds the requirements of MIL PRF 28800F Class 3 Caution Clean the NI PXI 665x module with...

Страница 46: ...108 EC Electromagnetic Compatibility Directive EMC Online Product Certification Refer to the product Declaration of Conformity DoC for additional regulatory compliance information To obtain product c...

Страница 47: ...ing center For more information about WEEE recycling centers National Instruments WEEE initiatives and compliance with WEEE Directive 2002 96 EC on Waste and Electronic Equipment visit ni com environm...

Страница 48: ...fy your systems accuracy and reliability requirements and provides warranty sparing and calibration services to help you maintain accuracy and minimize downtime over the life of your system Visit ni c...

Страница 49: ...tions Engineers make sure every question submitted online receives an answer Software Support Service Membership The Standard Service Program SSP is a renewable one year subscription included with alm...

Страница 50: ...103 M mega 106 Symbols percent plus or minus positive of or plus negative of or minus per degree ohm A accumulator a part where numbers are totaled or stored ADE application development environment as...

Страница 51: ...the signal on the SMB output pin of the same name Either the OCXO clock or PXI_CLK10 can be routed to CLKOUT clock hardware component that controls timing for reading from or writing to groups Compac...

Страница 52: ...ed in events or oscillations per second using a frequency counter or spectrum analyzer Frequency is the reciprocal of the period of a signal frequency tuning word a number that specifies the frequency...

Страница 53: ...ources The most important specifications on oscillators are frequency accuracy frequency stability and phase noise output impedance the measured resistance and capacitance between the output terminals...

Страница 54: ...at connects DAQ devices directly by means of connectors on top of the devices for precise synchronization of functions S s seconds skew the actual time difference between two events that would ideally...

Страница 55: ...output time thold hold time tpd propagation delay time TRIG trigger signal trigger a digital signal that starts or times a hardware event for example starting a data acquisition operation tsetup setup...

Страница 56: ...cation diagram 3 4 3 5 3 6 signal description table 3 9 specifications A 2 clock generation DDS 3 10 overview 3 10 PXI_CLK10 and OCXO 3 11 color Access LED color explanation table 3 7 Active LED color...

Страница 57: ...4 1 configuring 2 2 connector descriptions 3 8 installing 2 1 overview 3 9 I installation hardware 2 1 software 2 1 L LED Access LED 3 7 Active LED 3 7 light emitting diode See LED M maximum signal r...

Страница 58: ...s routing 3 19 3 21 signal description table 3 10 specifications A 4 using front panel PFIs as outputs 3 15 using the PXI star triggers 3 18 using the PXI RTSI triggers 3 17 PXI_Trig PXI_Star synchron...

Страница 59: ...TAR 0 12 3 10 synchronous routing overview 3 19 possible sources and destinations 3 21 synchronization clock sources 3 21 timing diagram 3 20 T TCXO clock generation 3 11 clock using the PXI_CLK10 PLL...

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