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MC12061

Part Number	MC12061
Manufacturer	Motorola
Description	(MC12060 / MC12061) Crystal Switching Methods
Published	Jan 29, 2008
Detailed Description	www.DataSheet4U.com CRYSTAL MC1206[ @ “ ‘Semiconductor products .. gnc. ~ MOTOROLA ,, ..- ,. www.DataSheet4U.c...
Datasheet	MC12061 PDF File

Overview

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: MCI 2060/MC12061OSCILLATORS : is dso an economical dual diode in the configuration needed for tfis circuit.
The MPN3401 is used with the MC 12061 circuit because it offers a large off-to-on impedance ratio for low dc bias currents at frequencies within the range of the ,*!.
MC12061.
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tbk+ DC BIAS REQUIREMENTS .
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J\, ~orward bias for ,the.
,desired cryst~=~$~~yti:g diode (Dl ,’ D2; .
D3Y D4, or .
D5) is applie~,~b~~~~ing the five ‘position switch.
The’ bias current is#~~,#~y set.
by R17 desired to electronically switch series-resonant crystals ~ ‘ !<<,~r,.
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and R2 (R4, R6, R&,’and R1.
Oh$~e *$fl: @ remaining sets of Advantages to this switchitig scheme include the following: ‘ ~‘, R2 when fiey are switched~in}~Th~fiur bias “resistors, correspondi~$~$ the unselected crystals, 1.
Eliminates the need to run high frequency signals add a smaller arnoun~$~t, hkrent to the forward-biased through a mechanicrd switch; ~,,<$” diode.
The total for~$d~$i~s current, ID, can be describ2.
Permits switching crystals from a remote position ed by the formulas’Y~~~ti? with a minimum of disturbance to the oscillator; ~.
a.
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‘,$:$~22v 3.
Minimizes RF radiation; ID= 4.
Adapts easily to electronic scanning methods; - (~) (For MCI 2060); ‘:’’sS~’::”R3 + R4 t R19 5.
Operates from a sin~e polarity, low voltage sUPPIY , R2 + ],~~~ [J,J] , .
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4 ~{;t:;t>, ,%‘( )} (5.
0 volts).
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V-VD IQ’-’’*>(, - (~) (For MC1206 ‘1) .
GENERAL “: “’$~lR~+{R~711 (R3+ ‘~R13)} The MC 12060 and MC 12061 crystal oscillators are :J&~$i$~ specified for operating frequency ranges of 100 kHz to $y~~~~~$ 2.
O MHz, and 2.
0 MHz to 20 MHz respectively.
Their’ “ ‘ti’:$.
While one diode (or one diode pair in th...

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