CXA1786N 데이터 시트보기 (PDF) - Sony Semiconductor
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CXA1786N Datasheet PDF : 12 Pages
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CXA1786N
6. Reference signal (the input signal of reference counter)
The external oscillator signal can be used as the reference signal by inputting the signal of the external
oscillator to the OSCI pin, and the reference signal can be also generated by connecting the crystal resonator
to the OSCI and OSCO pins.
(1) Generation of the reference signal by the external oscillator
Input the signal to the OSCI pin via a capacitor as shown below when the external oscillator signal is use as
the reference signal.
OSCI
1
NC OSCO
2
3
(2) Generation of the reference signal by the built-in oscillator
Connect the crystal resonator between OSCI and OSCO pins as shown below. Use the crystal resonator of
several MHz and confirm the stability of the oscillation and others. The capacitance ratio of CI and Co
should be 1 to 2:1, and their values should be selected so that the serial capacitance of CI and Co may be
the load capacitance specified by the crystal vibrator.
OSCI
1
NC OSCO
2
3
CI
CO
Notes on Operation
• Be careful to use this IC because the electrostatic resistance is the rank "A" due to handling the higher
frequency signal of 1GHz
• Make the input route of the RF signal from the VCO as short as possible.
• Connect the Vcc and Vp pins to the ground respectively via the by-pass capacitors as short as possible
because the frequency of signal used in this IC is higher.
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