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AM1808AZCED3 Scheda tecnica(PDF) 74 Page - Texas Instruments

Il numero della parte AM1808AZCED3
Spiegazioni elettronici  AM1808 ARM Microprocessor
PDF  264 Pages
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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AM1808AZCED3 Scheda tecnica(HTML) 74 Page - Texas Instruments

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C2
C1
X1
OSCOUT
OSCIN
OSCVSS
ClockInput
toPLL
AM1808
SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010
www.ti.com
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
74
Peripheral Information and Electrical Specifications
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