Hello,
I would like to use a MAX038 IC for a function generator, but I have a doubt.
The datasheet says that varying the voltage from FADJ pin varies \(\pm 2.4\,\mathrm{V}\) varies the output frequency from 0.3 to 1.7 %.
At page 10 the datasheet says:
FADJ Input: The output frequency can be modulated by FADJ, which is intended principally for fine frequency control, usually inside phase-locked loops.
Then, a circuit using a PLL is shown at page 14.
If the frequency fine adjustment can be set by varying the voltage to FADJ, why it is not suggested to use (for example) a DAC regulation on FADJ ?
For my function generator, I would prefer to use a voltage regulation using a DAC.
Do you think it is a bad idea ?
Thank you for your suggestions.
I would like to use a MAX038 IC for a function generator, but I have a doubt.
The datasheet says that varying the voltage from FADJ pin varies \(\pm 2.4\,\mathrm{V}\) varies the output frequency from 0.3 to 1.7 %.
At page 10 the datasheet says:
FADJ Input: The output frequency can be modulated by FADJ, which is intended principally for fine frequency control, usually inside phase-locked loops.
Then, a circuit using a PLL is shown at page 14.
If the frequency fine adjustment can be set by varying the voltage to FADJ, why it is not suggested to use (for example) a DAC regulation on FADJ ?
For my function generator, I would prefer to use a voltage regulation using a DAC.
Do you think it is a bad idea ?
Thank you for your suggestions.