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AM1806 数据表(PDF) 69 Page - Texas Instruments |
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AM1806 数据表(HTML) 69 Page - Texas Instruments |
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69 / 241 page  C2 C1 X1 OSCOUT OSCIN OSCVSS ClockInput toPLL AM1806 www.ti.com SPRS658B – FEBRUARY 2010 – REVISED MAY 2010 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 PLLs 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 C1, C2 values are 10-20 pF. 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 Oscillator Table 6-2. Oscillator Timing Requirements PARAMETER MIN MAX UNIT fosc Oscillator frequency range (OSCIN/OSCOUT) 12 30 MHz Copyright © 2010, Texas Instruments Incorporated Peripheral Information and Electrical Specifications 69 Submit Documentation Feedback Product Folder Link(s): AM1806 |
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