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ICS81006I Datasheet(PDF) 8 Page - Integrated Device Technology |
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ICS81006I Datasheet(HTML) 8 Page - Integrated Device Technology |
8 / 14 page IDT™ / ICS™ VCXO-TO-LVCMOS OUTPUTS 8 ICS81006AKI REV A OCTOBER 2, 2006 ICS81006I VCXO-TO-6 LVCMOS OUTPUTS APPLICATION INFORMATION Oscillator FIGURE 1: VCXO OSCILLATOR CIRCUIT V C C V C S1 C L1 C S2 C L2 C V XTAL VCXO (Internal) Optional ➤ ➤ ➤ ➤ Control Voltage TABLE 5. EXAMPLE CRYSTAL PARAMETERS l o b m y Sr e t e m a r a Ps n o i t i d n o C t s e Tm u m i n i Ml a c i p y Tm u m i x a Ms t i n U f N y c n e u q e r F l a n i m o N 4 4 . 9 1z H M f T e c n a r e l o T y c n e u q e r F 0 2 ±m p p f S y t il i b a t S y c n e u q e r F 0 2 ±m p p e g n a R e r u t a r e p m e T g n i t a r e p O 00 7C ° C L e c n a t i c a p a C d a o L 2 1F p C O e c n a t i c a p a C t n u h S 4F p C , 0 C1 o i t a R y t il i b a ll u P 0 2 20 4 2 R S Ee c n a t s i s e R s e i r e S t n e l a v i u q E 0 2 l e v e L e v i r D 1W m C ° 5 2 @ g n i g A r a e y r e p 3 ±m p p n o i t a r e p O f o e d o M l a t n e m a d n u F VCXO CRYSTAL SELECTION Choosing a crystal with the correct characteristics is one of the most critical steps in using a Voltage Controlled Crystal Oscillator (VCXO). The crystal parameters affect the tuning range and V C Control voltage used to tune frequency C V Varactor capacitance, varies due to the change in control voltage accuracy of a VCXO. Below are the key variables and an example of using the crystal parameters to calculate the tuning range of the VCXO. C L1, CL2 Load tuning capacitance used for fine tuning or centering nominal frequency C S1, CS2 Stray Capacitance caused by pads, vias, and other board parasitics |
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