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AMPL138ZCE3 Datasheet(PDF) 77 Page - Texas Instruments

Part # AMPL138ZCE3
Description  OMAP-L138 Low-Power Applications Processor
PDF  268 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

AMPL138ZCE3 Datasheet(HTML) 77 Page - Texas Instruments

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6.5 Crystal Oscillator or External Clock Input
C2
C1
X1
OSCOUT
OSCIN
OSCVSS
ClockInput
toPLL
OMAP-L138 Low-Power Applications Processor
www.ti.com
SPRS586A – JUNE 2009 – REVISED AUGUST 2009
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
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Peripheral Information and Electrical Specifications
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