11/18/2023 0 Comments Surface mou t prototypingI am sure there are many ways of approaching this. It doesn't take much to induce a millivolt let alone 45uV. It looks like it may only be single ended too. Even at 16 bits with 3Vpp input, that's a resolution of 45uV. In addition, your ADC is capable of 24 bit resolution, although you'll probably only realistically get the equivalent of 18 to 20 bits if you're lucky however you roll it. Not only the PIC, but the bit clocks for the ADC and DAC. You will have plenty of stuff generating noise well into the 10s if not 100s of MHz. However, they are complex ICs and thus some experimentation is require to fully understand the implication all their features. Lets say you are a professional electronic engineer and have to design a product which uses components with high speed signals. When people want to create products with high speed signals to test it out, how to do they go about doing it? Do they start from the datasheet and then move to the manufacturers example of a board layout and pretty much copy paste it for use in their prototype? What if they realize that a connection is wrong, or they want to add more functionality? Does that mean a new printed circuit board is created wasting many days in wait? In other words. hmmm I do fully realize that 2 sided boards are required, after all, how else would a high speed signal propagate, it needs a ground plane. high speed effects when I use this crystal on a prototype board? I guess I will need to have adapter boards without any oscillator and once I put the different adapter boards onto the single prototype board, I can have the oscillator on the prototype Are you trying to say that even though I am running at a less then several 10s of MHz, I am still in a dangerous situation and can expect high speed effects? hmmm OK. I think that it is wise to supply the same clock to the PIC as well. I am using PCM1807 for ADC and PCM1753 for DAC. This is required for the data converters. By the way, I will need to use an oscillator crystal to supply clock, likely between 20 and 30 MHz. I think I should use them on the adapter boards. Any advice? Should I put zener diodes on the power supply pins of the different ICs I use along with smoothing capacitors? I intend to buy linear voltage regulators that will automatically generate the correct voltage for the IC. Then I think that maybe this is not a good idea, I should start with correct setup from the beginning. The idea there is to have the simplest setup to get up and running since if something does not work or gets busted then it will not be clear what is the source of the problem. The ICs will work but may be not optimally. Where can I find advice on how to put so many power rails onto a single PCB? I think that for purpose of prototype only, in the beginning atleast, I should be able to ignore the distinction and use a single power source. The thing here is I have analogue supply, digital supply, analogue ground, digital ground and then reference voltage for the data converters as well. So if something stops working, I need to spend a lot of time. The main concern I have is that each chip is new for me. Do you have any advice on what I should and should not do here. The other option is to have small adapter boards for each surface mount component and then use them on the prototype board like a normal through hole component is. But then there will be a problem if I want to modify the connections or expand the circuit. One thing to do is to make a whole board at once. The TSSOP and SSOP won't fit on a prototype board, and it seems that the PIC32 does not exist in a 0.1 inch through hole package as well. Usually when we do experiments like this, we would have through hole components, we put them on a prototype board and connect it up using wires and then do what we want. I am getting a SOIC PIC32 since the other 2 data converting ICs are surface mount anyway. I will need to do some "experiments" to fully understand how to use the new TSSOP (an Audio ADC) and SSOP (an Audio DAC) chips with the PIC32 in SOIC packge. I do not have experience with surface mount soldering, but lets put that aside for now. So I have searched long and hard and came to the conclusion that I shall have to get TSSOP, SSOP and SOIC packages to create my prototype.
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