LMX2305 datasheet(10/14 Pages) NSC | PLLatinumTM 550 MHz Frequency Synthesizer for RF Personal Communications

Part No.	LMX2305

Description	PLLatinumTM 550 MHz Frequency Synthesizer for RF Personal Communications

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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Typical Application Example

Operational Notes

TLW12459 – 22

VCO is assumed AC coupled

RIN increases impedance so that VCO output power is provided to the load rather than the PLL Typical values are 10X to 200X depending on the VCO power

level fIN RF impedance ranges from 40X to 100X

50X 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 OSCIN may be AC or DC coupled AC coupling is recommended because the input circuit provides its own bias (See Figure below)

TLW12459 – 23

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

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LMX2305 Datasheet(PDF) 10 Page - National Semiconductor (TI)

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