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LMX2604 Folha de dados(PDF) 12 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LMX2604
Descrição Electrónicos  Triple-band VCO for GSM900/DCS1800/PCS1900
PDF  14 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX2604 Folha de dados(HTML) 12 Page - National Semiconductor (TI)

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Functional Description (Continued)
FREQUENCY ACQUISITION
On the rising edge of CE the VCO goes through a frequency
acquisition mode which coarse locks the PLL to the approxi-
mate final frequency. This portion of the lock digitally sets the
frequency such that the final tuning voltage on the CPin line
of the VCO is approximately Vdd/2. Benefits of this system is
the maximum required charge pump voltage is reduced as
large frequency ranges may be tuned with a small tuning
voltage. This makes the digitally tuned VCO different from
conventional analog VCOs.
Frequency Acquisition Timing Diagram
20066122
www.national.com
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