SLLU131B – July 2010 – Revised February 2011
Crystal or Oscillator Support
The TUSB9260 DEMO can support either a crystal or oscillator reference clock. By default the board is
configured to use a 25-MHz crystal. To use an oscillator R23 and R37 need to be populated with a 0-ohm
resistor. C17 and C19 need to be de-populated. The crystal or oscillator should be rated for 1.8 V with
PPM of ±100 or better. The frequency of the clock is configurable via resistors R10-R13.
Table 1
shows
how to populate resistors R10-R13 for desired clock frequency.
Table 1. Table 1. Frequency Select Map
FREQUENCY (MHz)
R10
R11
R12
R13
20
POP
POP
25
POP
POP
30
POP
POP
40
POP
POP
12
Crystal or Oscillator Support
SLLU131B – July 2010 – Revised February 2011
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