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LMX2335LSLB датащи(PDF) 15 Page - National Semiconductor (TI) |
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LMX2335LSLB датащи(HTML) 15 Page - National Semiconductor (TI) |
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15 / 22 page ![]() Typical Application Example DS012807-11 Operational Notes: * VCO is assumed AC coupled. ** R IN increases impedance so that VCO output power is provided to the load rather than the PLL. Typical values are 10Ω to 200 Ω depending on the VCO power level. f IN RF impedance ranges from 40Ω to 100Ω.fIN IF impedances are higher. *** 50 Ω termination is often used on test boards to allow use of external reference oscillator. For most typical products a CMOS clock is used and no terminating resistor is required. OSC inmay be AC or DC coupled. AC coupling is recom- mended because the input circuit provides its own bias. (See Figure below). **** R2 configured F oLD for use in FastLock mode. ***** Adding RC filters to the V CC lines is recommended to reduce loop-to-loop noise coupling. DS012807-12 Application Hints: Proper use of grounds and bypass capacitors is essential to achieve a high level of performance. Crosstalk between pins can be reduced by careful board layout. This is an electrostatic sensitive device. It should be handled only at static free work stations. www.national.com 15 |
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