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AM1705DPTP3 bảng dữ liệu(PDF) 43 Page - Texas Instruments |
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AM1705DPTP3 bảng dữ liệu(HTML) 43 Page - Texas Instruments |
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43 / 165 page  C2 C1 X1 OSCOUT OSCIN OSCVSS ClockInput toPLL AM1705 www.ti.com SPRS657E – FEBRUARY 2010 – REVISED JUNE 2014 6.5 Crystal Oscillator or External Clock Input The device includes two choices to provide an external clock input, which is fed to the on-chip PLL to generate high-frequency system clocks. These options are illustrated in Figure 6-6 and Figure 6-7. For input clock frequencies between 12 and 20 MHz, a crystal with 80 ohm max ESR is recommended. For input clock frequencies between 20 and 30 MHz, a crystal with 60 ohm max ESR is recommended. Typical load capacitance values are 10-20 pF, where the load capacitance is the series combination of C1 and C2. The CLKMODE bit in the PLLCTL register must be 0 to use the on-chip oscillator. If CLKMODE is set to 1, the internal oscillator is disabled. • Figure 6-6 illustrates the option that uses on-chip 1.2V oscillator with external crystal circuit. • Figure 6-7 illustrates the option that uses an external 1.2V clock input. Figure 6-6. On-Chip 1.2V Oscillator Table 6-2. Oscillator Timing Requirements PARAMETER MIN MAX UNIT fosc Oscillator frequency range (OSCIN/OSCOUT) 12 30 MHz Copyright © 2010–2014, Texas Instruments Incorporated Peripheral Information and Electrical Specifications 43 Submit Documentation Feedback Product Folder Links: AM1705 |
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