Sommes said:
I am doing a analog project.
The topic: High stability variable oscillator
Select and test an appropriate digital oscillator circuit for producing an
accurate variable oscillation from 1kHz to 1MHz
What I think is I have to use crystal oscillator to make stable oscillation.
I will chose 1MHz crystal oscillation...after I may need to adjust 1MHz to
1KHz range.
Please let me know the right track...Thanks...
If you want a continous varying crystal derived frequency over that
range (which is very large) then your best bet is a Direct Digital
Synthesis (DDS) chip like the AD9835. Basically a single chip solution.
Although if it's an "analog" project, the DDS may not be suitable
because it uses digital techniques.
You may also want to consider a MAX038 waveform generator. Although it
is not crystal derived, it can be quite stable if using the right
components. The MAX038 uses "analog" techniques, so it may be more
suitable. Another single chip solution.
The MAX038 is easier to implement than the DDS chip.
Regards
Dave