Texas Instruments TSW4806EVM, User Manual

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TSW4806 GUI Operation
7 SLAU454A – July 2012 – Revised April 2016
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TSW4806EVM
3 TSW4806 GUI Operation
1. Apply 5 V to the board. Start the TSW4806 GUI by going to the Start Menu → All Programs → Texas
Instruments ADCs → TSW4806 GUI .
2. Make sure the USB Status green indicator lights.
3. Click the Load button and select the file named 122.88_61.44.txt . Click OK .
4. Click Send All . At this point, the LED labeled D1 on the TSW4806 lights, indicating a PLL lock.
5. Configure the board such that a 122.88-MHz clock is present on SMA’s J2, J3, J4, and J6. SMA’s J1,
J7, J15 and J17 have 61.44-MHz clock outputs.
The output clocks are determined by the value the internal VCO is running at and the divide value
selected for the output. In this example, the VCO is operating in single PLL mode and locked to the on-
board 10-MHz oscillator. The value the PLL2 is setting the VCO too is determined as follows:
REF CLK / R divider = VCO / N divider / Prescaler
10MHz / 125 = VCO / 3840 / 8
VCO = 2457.6MHz
Figure 5. PLL2 Settings
Using the divided values shown in Figure 6 results in the following for Clock Out 0, 1, 2, and 3: 2457.6 / 20
= 122.88 MHz.
Using the divided values shown in Figure 6 results in the following for Clock Out 6, 7, 8, 9, 10 and 11:
2457.6 / 40 = 61.44 MHz.