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TSW4806 GUI Operation

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.

SLAU454–July 2012 TSW4806EVM

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