Programming Assistant - Texas Instruments CDCE906 User Manual

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The Programming Assistant starts with its own default setup. The default setup of the Programming
Assistant is different to the default setup of the CDCE906/CDCE706. This is why, the Programming
Assistant has a simple startup setup, which makes it easy to create a new user-defined setup. From this
default setup, different parameters can be edited to create a user setup. All dividers, the VCO frequency,
the SSC modulation frequency, the switch A/B settings, as well as the actual output frequency, and the
actual error of all outputs, are calculated by defining the following parameters:
signal source
fin
CDCE906/
CDCE706 Switch
SSC Modulation
fmod
fout
error
disable PLL
bypass
activate SSC
disable output
SCAU016B – August 2006 – Revised August 2007
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Figure 5. Programming Assistant
Choose among crystal oscillator, LVMOS, and differential clock source
Choose from 1 MHz to 167/200 MHz for CDCE906/CDCE706 LVCMOS/differential
input and from 8 MHz to 54 MHz for crystal oscillator
Choose if a CDCE706 or a CDCE906 setup is provided
Choose between no modulation and different center and down-spread modulations
provided by PLL 2
Choose a modulation frequency for SSC; actual fmod shows the closest possible
modulation frequency
Choose the output frequency for Y0–Y5; actual fout displays the closest possible
output frequency with an error in frequency smaller than |error|
Choose the maximum allowed error between fout and actual fout; actual error
displays the error of current frequency actual fout
If the input frequency is a multiple of fout, fout is derived directly from fin. Click
disable PLL bypass if Yx should be derived from a PLL.
Choose which outputs will have SSC. All outputs with SSC activated must be
derived from the same PLL.
Choose which outputs will be disabled. The Switch A will be set to input clock and P
Divider will be set to 1 for each disabled output.
CDCE906/CDCE706 Performance Evaluation Module
TI Pro-Clock™
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