I do not need a precise VCO, actually I want to control the frequency by the help of R2R (ladder network), where the digital input value will increase/decrease the DC voltage of R2R network, so the frequency may be varied from 1Hz to 5Khz (i.e. My desired frequency). So what should I do?
I do not need a precise VCO, actually I want to control the frequency by the help of R2R (ladder network), where the digital input value will increase/decrease the DC voltage of R2R network, so the frequency may be varied from 1Hz to 5Khz (i.e. My desired frequency). So what should I do?
Go here:
Scroll down until you find fig. 10. It's a little complex, but it allows wide freq variation and maintains 50% duty cycle, or 1:1 mark/space as our British friends say![]()
I do not need a precise VCO, actually I want to control the frequency by the help of R2R (ladder network), where the digital input value will increase/decrease the DC voltage of R2R network, so the frequency may be varied from 1Hz to 5Khz (i.e. My desired frequency). So what should I do?
...Did you try simply using the 'control voltage' input? That's what it does, it varies the frequency as the voltage changes.