Datasheet

SLLU139–February 2011
Crystal or Oscillator Support
The TUSB9261 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-Ω
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 SLLU139–February 2011
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