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AD9122 Arkusz danych(PDF) 7 Page - Analog Devices |
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AD9122 Arkusz danych(HTML) 7 Page - Analog Devices |
7 / 8 page Circuit Note CN-0243 Rev. 0 | Page 7 of 8 PC I Q USB +5V GND USB USB ADAPTER BOARD DPG2 DIGITAL PATTERN GENERATOR EVAL-CN0243-EB1Z EVALUATION BOARD REFERENCE FREQUENCY GENERATOR 10MHz – 200MHz +3dBm SPECTRUM ANALYZER POWER SUPPLY PLL REFERENCE INPUT RF OUTPUT IQ DATA DIGITAL INTERFACE Figure 13. Test Setup Functional Block Diagram data rate should be equal to the DAC sample rate (614.4 MSPS) in Figure 13 divided by the programmed interpolation rate of the AD9122. 5. Note that as the various devices are activated and programmed, the current will increase. At the end of this exercise, the current should be between 1.4 A and 1.5 A, depending on DAC sample rate. 6. Use the DPG2 software to create a waveform (single, multi tone, or comms standard signals are available). A digital back-off of −8 dB should be used initially to optimize linearity of the DAC/ADRF6702 combination. Complex signal generation should also be selected in the DPG2 GUI. When the waveform is created, use the "load" and "play" buttons in the GUI to load the digital pattern into the DPG memory itself. 7. Start the ADRF6702 GUI. To begin with, the only options in the ADRF6702 GUI which need to be selected are the input reference frequency and LO output frequency. To program these values, click the reference input frequency or the LO output values in the top center of the ADRF6702 GUI. Another window will appear which will allow you to enter these values. Important: After entering these values, the user must finish with a carriage return to make sure that the values are entered into the GUI. 8. Programming the ADRF6702 is the last step in setting up the EVAL-CN0243-EB1Z evaluation board. As an example, if the DPG2 generates a series of tones (20 MHz to 25 MHz with 1 MHz spacing) @ −8 dB back-off, and the LO of the ADRF6702 is programmed to 1940 MHz, the spectrum should look very similar to that shown in Figure 14. –20 –30 –40 –50 –60 –120 –110 –100 –90 –80 –70 CENTER 1.94GHz 10MHz/DIV SPAN 100MHz REF –20dBm ATT 10dBm RBW 10kHz VBW 30kHz SWT 15ms MARKER 1 [T1] –104.90dB 1.89005GHz Figure 14. Spectrum of Complex Multitone Signal at LO Frequency of 1940 MHz at ADRF6702 RF Output, Desired Sideband Offset: +20 MHz, Undesired Sideband Offset: −20 MHz |
Podobny numer części - AD9122 |
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Podobny opis - AD9122 |
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