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PL565-68DC Datasheet(PDF) 7 Page - Micrel Semiconductor |
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PL565-68DC Datasheet(HTML) 7 Page - Micrel Semiconductor |
7 / 12 page (Preliminary) Analog Frequency Multiplier PL565-68 VCXO Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 9 44-0800 • fax +1(408) 474-1000 • www.micrel.com Rev 12/08/11 Page 7 INDUCTOR VALUE OPTIMIZAT ION The required inductor values for the best performance depend on the operating frequency, and the board layout or module specifications. The listed values in this datasheet are based on the calculated parasitic values from Micrel’s evaluation board design. These inductor values provide the user with a starting point to determine the optimum inductor values. Additional fine-tuning may be required to determine the optimal solution. The inductor is recommended to be a high Q small size 0402 or 0603 SMD component, and must be placed between L2X and adjacent VDDOSC pin. Place inductor as close to the IC as possible to minimize parasitic effects and to maintain inductor Q. To assist with the inductor value optimization, Micrel has developed AFM “Tuning Assistant” documents. You can download these documents from Micrel’s web site (www.micrel.com). The documents consist of tables with recommended inductor values for certain output frequency ranges. Figure 10: Diagram Representation of the Related System Inductance and Capacitance DIE SIDE PCB side - Cinternal at L2X = 7.625 pF - LWB1 = 2 nH, (2 places), Stray inductance - Cpad = 1.0 pF, Bond pad and its ESD circuitry - Cstray = 0.5 pF, Stray capacitance - C11 = 0.4 pF, The following amplifier stage - L2X = 2x inductor - C2X = range (0.1 to 2.7 pF), Fine tune the tank, if used. Work out the resonance of this network and you have a good first guess for the required inductor values for optimum performance. Non-linear behavior at large signal amplitudes can shift the tank resonance significantly, especially at the L2X side, to a lower frequency than the calculation suggests. The Tuning Assistant documents are based upon actual lab tests and are corrected for the non -linear behavior. |
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