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ADRF6801 Datasheet(PDF) 12 Page - Analog Devices |
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ADRF6801 Datasheet(HTML) 12 Page - Analog Devices |
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12 / 36 page  ADRF6801 Rev. 0 | Page 12 of 36 SYNTHESIZER/PLL VS = 5 V. See the Register Structure section for recommended settings used. External loop filter bandwidths of ~130 kHz and 2.5 kHz used (see plots within this section for annotations), fREF = fPFD = 26 MHz, measured at BB output, fBB = 50 MHz, unless otherwise noted. –160 –140 –120 –100 –80 –60 –40 1k 10k 100k 1M 10M OFFSET FREQUENCY (Hz) 2.5kHz LOOP FILTER BANDWIDTH 130kHz LOOP FILTER BANDWIDTH TA = +85°C TA = +25°C TA = –40°C Figure 21. Phase Noise vs. Offset Frequency, fLO = 900 MHz, Shown for Loop Filter Bandwidths of 2.5 kHz and 130 kHz –110 –105 –100 –95 –90 –85 –80 –75 –70 750 800 850 900 950 1000 1050 1100 1150 LO FREQUENCY (MHz) TA = +85°C TA = +25°C TA = –40°C 1 × PFD FREQUENCY 3 × PFD FREQUENCY 0.5 × PFD FREQUENCY Figure 22. PLL Reference Spurs vs. LO Frequency, Using Loop Filter Bandwidth of 130 kHz –110 –105 –100 –95 –90 –85 –80 –75 –70 750 800 850 900 950 1000 1050 1100 1150 LO FREQUENCY (MHz) TA = +85°C TA = +25°C TA = –40°C 2 × PFD FREQUENCY 4 × PFD FREQUENCY Figure 23. PLL Reference Spurs vs. LO Frequency, Using Loop Filter Bandwidth of 130 kHz 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 750 800 850 900 950 1000 1050 1100 1150 LO FREQUENCY (MHz) TA = +85°C TA = +25°C TA = –40°C Figure 24. Integrated Phase Noise vs. LO Frequency (Spurs Omitted), Using Loop Filter Bandwidth of 130 kHz –170 –150 –130 –110 –90 –70 –50 750 800 850 900 950 1000 1050 1100 1150 LO FREQUENCY (MHz) 1kHz OFFSET 10kHz OFFSET 5MHz OFFSET 10kHz OFFSET 1kHz OFFSET 5MHz OFFSET 130kHz LOOP FILTER BANDWIDTH 2.5kHz LOOP FILTER BANDWIDTH TA = +85°C TA = +25°C TA = –40°C Figure 25. Phase Noise vs. LO Frequency (1 kHz, 10 kHz, and 5 MHz Offsets), Shown for Loop Filter Bandwidths of 2.5 kHz and 130 kHz –160 –150 –140 –130 –120 –110 –100 –90 750 800 850 900 950 1000 1050 1100 1150 LO FREQUENCY (MHz) 100kHz OFFSET 1MHz OFFSET 100kHz OFFSET 130kHz LOOP FILTER BANDWIDTH 2.5kHz LOOP FILTER BANDWIDTH TA = +85°C TA = +25°C TA = –40°C 1MHz OFFSET Figure 26. Phase Noise vs. LO Frequency (100 kHz and 1 MHz Offsets), Shown for Loop Filter Bandwidths of 2.5 kHz and 130 kHz |
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