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PulseBlasterDDS-I-300

IV. PCI Connection - Connecting to the 
PulseBlasterDDS-I-300-PCI boards

Connector Information

There are two main connector types on the PulseBlasterDDS-I-300 PCI board: the BNC connectors and the IDC 

headers – see Figure 11 below.  BNC connectors are mounted on the PCI bracket and are available outside of the 
computer.  The IDC connectors are mounted on-board and are available inside the computer only.  There are two long IDC
headers and one short IDC header.

BNC Connectors

The four BNC connectors provide the primary output interface of the PulseBlasterDDS-I-300 PCI board.  All connectors 

are impedance matched to 50 Ω.  BNC2 is the Analog Output port.  BNC1 and BNC0 are both general purpose digital 
outputs which can be controlled through the pulse program.  BNC3 is not used for the PulseBlasterDDS-I-300.

The analog output connector (BNC2), is not equipped with an interpolating filter.  This allows for maximum flexibility in 

output frequency, but it means that the output may appear quantized if no filter is used on the output.  To eliminate this 
behavior and obtain a smooth RF pulse, the user may filter the output with a bandpass or lowpass filter which will cut off 
the undesired frequency components above the intended RF signal.

Long IDC Headers

There are two long (2x13 pins) IDC headers on the PulseBlasterDDS-I-300 PCI board.  The headers provide access to 

all 24 bits of the flag word, nine of which are available to the user as general purpose digital outputs.  These are labeled 
Flag0..11_Out and Flag12..23_Out.  On each IDC header the top row of pins (14-26) are grounds, and the signals are 
carried on pins 1-13.

http://www.spincore.com

                           20

2017-11-14

Figure 12:

 IDC header pinout.

14 15 16 17 18 19 20 21 22 23 24 25 26

 1  2  3  4  5  6  7  8  9 10 11 12 13

Figure 11:

 PCI Board Connector Locations.

IDC Headers 

BNC3 (Not Used)

BNC1 (Digital Out)

BNC0 (Digital Out)

Hardware Trigger/Reset 

(Digital Out) 

BNC2 (Analog Out)

IDC Headers 

Flag0..11_Out

Flag12..23_Out

Содержание DDS-I-300

Страница 1: ...PulseBlasterDDS Model DDS I 300 USB Board Version SP7 Owner s Manual SpinCore Technologies Inc http www spincore com...

Страница 2: ...nologies Inc reserves the right to make changes to the product s or information herein without notice PulseBlasterDDS PulseBlaster SpinCore and the SpinCore Technologies Inc logos are trademarks of Sp...

Страница 3: ...lock output on BNC0 18 Clock Input Signal Standard 19 IV PCI Connection Connecting to the PulseBlasterDDS I 300 PCI boards 20 Connector Information 20 BNC Connectors 20 Long IDC Headers 20 HWTrig Rese...

Страница 4: ...he user the opportunity to explore novel excitation modes Select designs allow for external frequency modulation using dedicated hardware input lines Packaged in a small USB form factor the PulseBlast...

Страница 5: ...are driven from a common clock source the 50 MHz1 Reference Clock in Figure 1 The on board clock source is removable and in lieu of the on board clock any 3 3 V TTL compatible clock source of arbitra...

Страница 6: ...at 10 MHz See RF Output Level section on the next page for more information 2 Phase offset control word is 12 bit wide 3 Assuming a 50 MHz reference clock and a 300 MHz NCO frequency Frequency contro...

Страница 7: ...the same frequency range as the standard gain board Please note the sustained analog output voltage feature is only available on PCI boards To obtain a sustained analog output voltage set the frequen...

Страница 8: ...crew For the USB board Plug one end of the USB cable into the PulseBlasterDDS I 300 board and the other end into the host computer Next power the board through the 5 pin DIN type connector or 6 positi...

Страница 9: ...hes the characteristic impedance of the transmission line in parallel with the coaxial transmission line at the oscilloscope input by attaching it to the line through a T Adapter e g a 50 resistor wit...

Страница 10: ...hase offset registers one every 2 s 90 degrees apart and will repeat indefinitely To test the AWG feature of the board use pbdds_i_300_awg This program will ask for two amplitude values and one freque...

Страница 11: ...iew and Matlab provide mechanisms for accessing the functionality of standard libraries such as SpinAPI Please see the example programs described in the preceding section Testing the PulseBlasterDDS I...

Страница 12: ...ut Figure 5 below shows an example RF 70 MHz output pulse that was generated by the board The data was captured using a Tektronix TDS224 oscilloscope Notice the time base of 25 ns division 2 Firmware...

Страница 13: ...phase offset and a 70 MHz carrier frequency expanded view Figure 7 below demonstrates the frequency shift agility In this figure the frequency jumps from 20 MHz to 10 MHz with no latency http www spin...

Страница 14: ...he pb_dds_load function amp This selects which amplitude register to use The values stored in the amplitude register can be set with the pb_set_amp function Relevant SpinAPI functions pb_start_program...

Страница 15: ...PulseBlasterDDS I 300 Figure 8 Sinc shaped soft pulse Pulse duration of 0 5 ms Figure 9 Combination of soft RF pulses with variable amplitudes http www spincore com 15 2017 11 14...

Страница 16: ...nal Instruction data inst_data field which elaborates on that action In addition each instruction specifies the desired value for the flags as well as the execution time of the given instruction i e t...

Страница 17: ...of the PulseBlasterDDS I 300 each instruction in the pulse program specifies a flag word which sets both the internal control lines and user programmable digital outputs The control lines stay in the...

Страница 18: ...oards or on one of the on board IDC headers USB boards This signal is a 50 duty cycle square wave derived directly from the on board 50 MHz clock oscillator and is intended for synchronization purpose...

Страница 19: ...source It will accept external clock signals that conform to the low voltage 3 3 V TTL standard only Negative voltage below 0 2 Volts would damage the processor chip and thus any external sinusoidal...

Страница 20: ...n interpolating filter This allows for maximum flexibility in output frequency but it means that the output may appear quantized if no filter is used on the output To eliminate this behavior and obtai...

Страница 21: ...t detects a falling edge for example by shorting it with pin 4 a hardware trigger is produced This has the same effects as issuing a trigger through software although the hardware trigger is more prec...

Страница 22: ...log Ground Power sources should be connected as follows Digital Ground should be connected to the ground point of 5 V supply Analog Ground should be connected to the center point Ground Point of the 6...

Страница 23: ...pply is optionally available from SpinCore Technologies Inc For more information please see http spincore com products SP11 RadioProcessor USB Power Supply shtml or the Related Products and Accessorie...

Страница 24: ...list Table 7 Shrouded IDC Output Header J301 signal list http www spincore com 24 2017 11 14 Figure 17 Shrouded IDC Output Header J301 Pin number Function 1 Ground 2 Flag bit 0 3 Ground 4 Flag bit 1 5...

Страница 25: ...signal list HW_Trigger pin 8 When this input detects a falling edge for example by shorting it with pin 4 a hardware trigger is produced This has the same effects as issuing a trigger through software...

Страница 26: ...o perform FSK modulation The use of these frequency control lines to select between frequency registers is described below Header JP302 Frequency Select and HW Trigger Reset The unshrouded male header...

Страница 27: ...requency Register Selection list In order to use the hardware frequency select lines be sure to set the software frequency register select value to 0 Important Notes To select between frequency regist...

Страница 28: ...the parameters as described in this manual and run the program to control the digital pulse and RF generation of the board A sample screenshot is shown on the next page For more information see the La...

Страница 29: ...alternative clock frequencies or an Oven Controlled Crystal Oscillator OCXO please inquire with SpinCore Technologies through our contact form which is available at http www spincore com contact shtml...

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