Datenblatt-Suchmaschine für elektronische Bauteile |
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ADF4212L Datenblatt(PDF) 9 Page - Analog Devices |
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ADF4212L Datenblatt(HTML) 9 Page - Analog Devices |
9 / 20 page REV. 0 ADF4212L –9– 0 –20 –40 –60 –40 –20 0 20 40 TEMPERATURE – C 100 –80 –100 –120 60 80 TPC 19. RF Spurs vs. Temperature 0 –20 –40 –60 –40 –20 0 20 40 TEMPERATURE – C 100 –80 –100 –120 60 80 TPC 20. IF Spurs vs. Temperature FREQ/ MHz 0.561872 0.529742 0.514244 0.405754 0.379354 0.312959 0.322646 0.288881 0.199294 0.206914 0.168344 0.092764 0.036125 0.037007 –0.053842 50 150 250 350 450 550 650 750 850 950 1050 1150 1250 1350 1450 s11.REAL s11.IMAG s11.REAL s11.IMAG –0.021077 –0.110459 –0.085802 –0.18583 –0.245482 –0.282399 –0.305457 –0.358884 –0.541032 –0.585687 –0.482539 –0.530108 –0.590526 –0.592498 –0.655932 0.97692 0.942115 0.961217 0.920667 0.897441 0.888164 0.850012 0.760189 0.767363 0.779511 0.761034 0.624825 0.635364 0.630242 0.634506 1550 1650 1750 1850 1950 2050 2150 2250 2350 2450 2550 2650 2750 2850 2950 –0.648879 –0.668172 –0.702192 –0.714541 –0.703593 –0.802878 –0.80397 –0.807055 –0.758619 –0.725029 –0.770837 –0.778619 –0.706197 –0.716939 –0.736527 FREQ/ MHz TPC 21. S Parameter Data for the RF Input CIRCUIT DESCRIPTION Reference Input Section The Reference Input Stage is shown in Figure 2. SW1 and SW2 are normally-closed switches. SW3 is normally open. When power-down is initiated, SW3 is closed and SW1 and SW2 are opened. This ensures that there is no loading of the REFIN pin on power-down. POWER-DOWN CONTROL REFIN NC NC NO SW3 SW2 SW1 100k BUFFER TO R COUNTER NC = NO CONNECT Figure 2. Reference Input Stage RF/IF Input Stage The RF/IF Input Stage is shown in Figure 3. It is followed by a two-stage limiting amplifier to generate the CML (Current Mode Logic) clock levels needed for the prescaler. 2k 2k 1.6V BIAS GENERATOR RFINA RFINB AVDD AGND Figure 3. RF/IF Input Stage |
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