Hi,
I'm in the process of designing a small function generator based on the MAX038CPP ——a sort of handheld device with just this chip and a PIC to output the frequency to a small LCD. (RF:MAX038CPP.pdf)
The PIC will also control the form of the output wave, since you can do it digitally, but I'm not sure if I can also do the same with the capacitors for selecting the range; so my first question is:
1 - Is there any way to digitally switch between the capacitors for selecting the frequency range? I mean, having a button or two connected to the PIC which would emulate the function of a rotary switch.
2 - My second question is about the Phase Detector function of the MAX038: would I be able to add this in any useful way without connecting any external device; like getting a modulated frequency or any other function that could be added to this design? I already read the section about this function on the datasheet, but I can't figure out what use I can get out of this function without an external input.
3 - I've already chosen the power supply, but I've been think about this for a long time: is there any simple way to double the +5v supplied by an USB port -getting 10v out of it-? For example, the equivalent of this simple AC circuit, but for DC:
Thanks in advance for your help!
I'm in the process of designing a small function generator based on the MAX038CPP ——a sort of handheld device with just this chip and a PIC to output the frequency to a small LCD. (RF:MAX038CPP.pdf)
The PIC will also control the form of the output wave, since you can do it digitally, but I'm not sure if I can also do the same with the capacitors for selecting the range; so my first question is:
1 - Is there any way to digitally switch between the capacitors for selecting the frequency range? I mean, having a button or two connected to the PIC which would emulate the function of a rotary switch.
2 - My second question is about the Phase Detector function of the MAX038: would I be able to add this in any useful way without connecting any external device; like getting a modulated frequency or any other function that could be added to this design? I already read the section about this function on the datasheet, but I can't figure out what use I can get out of this function without an external input.
3 - I've already chosen the power supply, but I've been think about this for a long time: is there any simple way to double the +5v supplied by an USB port -getting 10v out of it-? For example, the equivalent of this simple AC circuit, but for DC:
Thanks in advance for your help!