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CC1021-RTR1 датащи(PDF) 12 Page - Texas Instruments |
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CC1021-RTR1 датащи(HTML) 12 Page - Texas Instruments |
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12 / 92 page ![]() CC1021 SWRS045 Page 12 of 91 4.5. Crystal Oscillator Section Parameter Min Typ Max Unit Condition / Note Crystal Oscillator Frequency 4.9152 14.7456 19.6608 MHz Recommended frequency is 14.7456 MHz. See section 19 on page 58 for details. Crystal operation Parallel C4 and C5 are loading capacitors. See section 19 on page 58 for details. Crystal load capacitance 12 12 12 22 16 16 30 30 16 pF pF pF 4.9-6 MHz, 22 pF recommended 6-8 MHz, 16 pF recommended 8-19.6 MHz, 16 pF recommended Crystal oscillator start-up time 1.55 1.0 0.90 0.95 0.60 0.63 ms ms ms ms ms ms 4.9152 MHz, 12 pF load 7.3728 MHz, 12 pF load 9.8304 MHz, 12 pF load 14.7456 MHz, 16 pF load 17.2032 MHz, 12 pF load 19.6608 MHz, 12 pF load External clock signal drive, sine wave 300 mVpp The external clock signal must be connected to XOSC_Q1 using a DC block (10 nF). Set XOSC_BYPASS = 0 in the INTERFACE register when using an external clock signal with low amplitude or a crystal. External clock signal drive, full-swing digital external clock 0 - VDD V The external clock signal must be connected to XOSC_Q1. No DC block shall be used. Set XOSC_BYPASS = 1 in the INTERFACE register when using a full-swing digital external clock. Table 7. Crystal oscillator parameters |
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