CXA3106Q
Divisor
This is used to input the frequency division ratio of the program counter. The value can be changed as
desired from 9 to 4111 by moving the cursor to the position of the number and pressing the Return or Enter
key. (Note: The operating range of the CXA3106Q is from 256 to 4096.) The value can also be incremented
or decremented by one step by pressing the Page Up or Page Down key, respectively.
The internal VCO has an oscillator frequency of 40 to 120MHz, so the output frequency and Divider (VCO
frequency divider) setting range are as follows.
40
Divider = 1
120
1/1
1/2
20 Divider = 2 60
10
30
1/4
Divider = 4
40
80
120
O/P Frequency [MHz]
Divider
This sets the VCO output frequency division ratio to 1/1, 1/2 or 1/4. The frequency division ratio changes
repeatedly in the order of 1/1 → 1/2 → 1/4 → 1/1 each time the cursor is moved to the position of the number
and the Return or Enter key is pressed.
Coarse Delay
This is the DSYNC upper delay time setting. The value can be changed by moving the cursor to the position
of the number and pressing the Return or Enter key. The delay time variable range settings are "00" (1 CLK),
"01" (2 CLK), "10" (3 CLK) or "11" (4 CLK).
Fine Delay
This is the DSYNC lower delay time setting. The value can be changed by moving the cursor to the position
of the number and pressing the Return or Enter key. The value can also be incremented or decremented by
one step by pressing the Page Up or Page Down key, respectively. The delay time can be varied from 1/16
CLK to 32/16 CLK by setting "0" to "31", respectively.
Charge Pump
This is the charge pump circuit KI setting. The value can be changed by moving the cursor to the position of
the number and pressing the Return or Enter key. KI can be set to "00" (about 100µA), "10" (about 400µA) or
"11" (about 1.6mA).
The setting "01" is not used. (Setting "01" is the same as setting "00".)
Polarity
These are the SYNC, DSYNC and PD (Phase Detector) polarity inversion settings, and should be set as
necessary such as when inverting the SYNC input and DSYNC output waveforms. The setting value "1" is
positive polarity, and "0" is negative polarity. These should normally all be set to "1". (Fix PD to "1" other than
during test mode.)
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