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MC13175D Scheda tecnica(PDF) 11 Page - LANSDALE Semiconductor Inc.

Il numero della parte MC13175D
Spiegazioni elettronici  UHF FM/AM Transmitter
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Produttore elettronici  LANSDALE [LANSDALE Semiconductor Inc.]
Homepage  http://www.lansdale.com
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LANSDALE Semiconductor, Inc.
ML13175/ML13176
REFERENCE CRYSTAL OSCILLATOR
(Pins 8 and 9)
Selection of Proper Crystal: A crystal can operate in a num-
ber of mechanical modes. The lowest resonant frequency
mode is its fundamental while higher order modes are called
overtones. At each mechanical resonance, a crystal behaves
like a RLC series–tuned circuit having a large inductor and a
high Q. The inductor Ls is series resonance with a dynamic
capacitor, Cs determined by the elasticity of the crystal lattice
and a series resistance Rs, which accounts for the power dissi-
pated in heating the crystal. This series RLC circuit is in par-
allel with a static capacitance, Cp which is created by the
crystal block and by the metal plates and leads that make con-
tact with it.
Figure 20 is the equivalent circuit for a crystal in a signal res-
onant mode. It is assumed that other modes of resonance are
so far off frequency that their effects are negligible.
Series resonant frequency, fs is given by;
fs = 1/2π(LsCs)1/2
and parallel resonant frequency, fp is given by;
fp = fs(1 + Cs/Cp)1/2
the frequency separation at resonance is given by;
∆f = fp–fs = fs[1 – (1+ Cs/Cp)1/2]
Usually fp is less than 1% higher than fs, and a crystal
exhibits an extremely wide variation of the reactance with
frequency between fp and fs. A crystal oscillator circuit is
very stable with frequency. This high rate of change of
impedance with frequency stabilizes the oscillator, because
any significant change in oscillator frequency will cause a
large phase shift in the feedback loop keeping the oscillator
on frequency.
Legacy Applications Information
Figure 20. Crystal Equivalent Circuit
C3
R3
L3
Cp
www.lansdale.com
Page 11 of 16
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