Texas Instruments TUSB9261 Demonstration & Reference Design TUSB9261DEMO TUSB9261DEMO 数据表
产品代码
TUSB9261DEMO
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-
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.
PPM of ±100 or better. The frequency of the clock is configurable via resistors R10-R13.
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
© 2011, Texas Instruments Incorporated