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ML145145 Folha de dados(PDF) 9 Page - LANSDALE Semiconductor Inc.

Nome de Peças ML145145
Descrição Electrónicos  4-Bit Data Bus Input PLL Frequency Synthesizer
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Fabricante Electrônico  LANSDALE [LANSDALE Semiconductor Inc.]
Página de início  http://www.lansdale.com
Logo LANSDALE - LANSDALE Semiconductor Inc.

ML145145 Folha de dados(HTML) 9 Page - LANSDALE Semiconductor Inc.

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LANSDALE Semiconductor, Inc.
ML145145
RECOMMENDED READING
Technical Note TN–24, Stated Corp.
Technical Note TN–\7, Stated Corp.
E. Hafner, “The Piezoelectric Crystal Unit – Definitions and
Method of Measurement”, Proc IEEE, Vol. 57, No. 2 Feb.,
1969
D. Kemper, L. Rosine, “Quartz Crystals for Frequency
Control”, Electro–Technology, June, 1969.
P.J. Ottowitz, “A Guide to Crystal Selection”, Electronic
Design, May, 1966.
LEGACY APPLICATIONS
The features of the ML145145 permit bus operation with a
dedicated wire needed only for the strobe input. In a micro-
processor–controlled system this strobe input is accessed when
the PLL is addressed. The remaining data and address inputs
will directly interface to the microprocessor’s data and address
buses.
The ÷ R programability is used to advantage in Figure 10.
Here, the nominal ÷ R value is 3667, but by programming
small changes in this value, fine tuning is accomplised. Better
tuning resolution is achievable with this method than by chang-
ing the ÷ N due to the use of the large fixed prescaling value
of ÷ 256 provided by the ML12079.
The two–loop synthesizer, in Figure 11, takes advantage of
these features to control the phase–locked loop with a minu-
mum of dedicated lines while preserving optimal loop per-
formance. Both 25 Hz and 100 Hz steps are provided while the
relatively large reference frequencies of 10 Khz or 10.1 kHz
are maintained.
Issue b


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