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LMX2335 Datasheet(PDF) 12 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2335
Description  PLLatinum™ Dual Frequency Synthesizer for RF Personal Communications
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX2335 Datasheet(HTML) 12 Page - National Semiconductor (TI)

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Typical Application Example
Application Information
A block diagram of the basic phase locked loop is shown in
Figure 1.
DS012332-10
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
in may be AC or DC coupled. AC coupling is recom-
mended because the input circuit provides its own bias. (See
Figure below).
**** Adding RC filters to the V
CC lines is recommended to reduce loop-to-loop noise coupling.
DS012332-11
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.
DS012332-12
FIGURE 1. Conventional PLL Architecture
www.national.com
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