LMX2335LSLB datasheet(15/22 Pages) NSC

Il numero della parte	LMX2335LSLB

Spiegazioni elettronici	PLLatinum??Low Power Dual Frequency Synthesizer for RF Personal Communications

PDF	22 Pages

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Produttore elettronici	NSC [National Semiconductor (TI)]

Homepage	http://www.national.com

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Typical Application Example

DS012807-11

Operational Notes:

VCO is assumed AC coupled.

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.

***

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.

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