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Si5342A-D-GM Datasheet(PDF) 8 Page - Silicon Laboratories |
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Si5342A-D-GM Datasheet(HTML) 8 Page - Silicon Laboratories |
8 / 60 page 3.6 Digitally Controlled Oscillator (DCO) Mode The output MultiSynths support a DCO mode where their output frequencies are adjustable in predefined steps defined by frequency step words (FSW). The frequency adjustments are controlled through the serial interface or by pin control using frequency increment (FINC) or decrement (FDEC). A FINC will add the frequency step word to the DSPLL output frequency, while a FDEC will decrement it. Any number of MultiSynths can be updated at once or independently controlled. The DCO mode is available when the DSPLL is operat- ing in either free-run or locked mode. OSC XB XA 25-54MHz XTAL 2xCL 2xCL Crystal Resonator Connection OSC XB XA 25-54MHz XO 100 Differential XO Connection OSC XB XA 25-54MHz XO Single-Ended XO Connection 2xCL 2xCL 2xCL Si5345/44/42 2xCL ÷ PREF ÷ PREF ÷ PREF Si5345/44/42 Si5345/44/42 Figure 3.3. Crystal Resonator and External Reference Clock Connection Options 3.7 Inputs (IN0, IN1, IN2, IN3) There are four inputs that can be used to synchronize the DSPLL. The inputs accept both differential and single-ended clocks. Input selection can be manual (pin or register controlled) or automatic with user definable priorities. Si5345/44/42 Rev D Data Sheet Functional Description silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 7 |
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