LMX2320 National Semiconductor, LMX2320 Datasheet - Page 14

• Manufacturer Part Number: LMX2320
• Description: Frequency Synthesizer for RF Personal Communications
• Manufacturer: National Semiconductor

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Typical Application Example
Operational Notes
Layout Hints
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VCO is assumed AC coupled
R
level f
50
resistor is required OSC
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 a static sensitive device It should be handled only at static free work stations
IN
increases impedance so that VCO output power is provided to the load rather than the PLL Typical values are 10
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
IN
RF impedance ranges from 40
IN
may be AC or DC coupled AC coupling is recommended because the input circuit provides its own bias (See Figure below)
to 100
14
TL W 12339 – 28
to 200
depending on the VCO power
TL W 12339 – 27