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ADRF6807ACPZ-R7 数据表(PDF) 12 Page - Analog Devices |
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ADRF6807ACPZ-R7 数据表(HTML) 12 Page - Analog Devices |
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12 / 36 page  ADRF6807 Data Sheet Rev. B | Page 12 of 36 SYNTHESIZER/PLL VS1 = 5 V, VS2 = 3.3 V, see the Register Structure section for recommended settings used. External loop filter bandwidth of ~67 kHz, fREF = fPFD = 26 MHz, measured at BB output, fBB = 50 MHz, unless otherwise noted. –160 –150 –140 –130 –120 –110 –100 –90 –60 –70 –80 1k 10k 100k 1M 10M OFFSET FREQUENCY (Hz) TA =+85°C TA = +25°C TA = –40°C 67kHz LOOP FILTER 2.5kHz LOOP FILTER Figure 21. Phase Noise vs. Offset Frequency, fLO = 900 MHz –110 –105 –100 –95 –90 –85 –80 –75 –70 700 750 800 850 900 950 1000 1050 LO FREQUENCY (MHz) 0.5× PFD FREQUENCY 1× PFD FREQUENCY 3× PFD FREQUENCY TA = +85°C TA = +25°C TA = –40°C Figure 22. PLL Reference Spurs vs. LO Frequency –110 –105 –100 –95 –90 –85 –80 –75 –70 700 750 800 850 900 950 1000 1050 LO FREQUENCY (MHz) 2× PFD FREQUENCY 4× PFD FREQUENCY TA = +85°C TA = +25°C TA =–40°C Figure 23. PLL Reference Spurs vs. LO Frequency 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 700 750 800 850 900 950 1000 1050 LO FREQUENCY (MHz) TA =+85°C TA =+25°C TA = –40°C Figure 24. Integrated Phase Noise vs. LO Frequency (Spurs Omitted) –160 –150 –140 –130 –120 –110 –100 –80 –60 –90 –70 700 750 800 850 900 950 1000 1050 LO FREQUENCY (MHz) 67kHz LOOP FILTER BANDWIDTH 2.5kHz LOOP FILTER BANDWIDTH 1kHz OFFSET 10kHz OFFSET 5MHz OFFSET 1kHz OFFSET 10kHz OFFSET TA = +85°C TA = +25°C TA = –40°C Figure 25. Phase Noise vs. LO Frequency (1 kHz, 10 kHz, and 5 MHz Offsets) –160 –150 –140 –130 –120 –110 –100 –90 –80 700 750 800 850 900 950 1000 1050 LO FREQUENCY (MHz) 67kHz LOOP FILTER BANDWIDTH 2.5kHz LOOP FILTER BANDWIDTH TA =+85°C TA = +25°C TA = –40°C 100kHz OFFSET 100kHz OFFSET 1MHz OFFSET Figure 26. Phase Noise vs. LO Frequency (100 kHz and 1 MHz Offsets) |
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