But it does not help using a 18 or 24 bit ADC. If the design is bad and and full of noise. I think the reason for that most MCUs most often has 10 bits ADCs. Is the that internal noise make it hard to make something better and still keep the price down.Oops,forgot to mention my biggest reason to use it: it can do up to an 18 bit conversion.
I need the bits. <grin>
agree, I am working on digital power supply for myself, and there are a few know fault on my design at ADC end, result? my 10bit ADC in my MCU is not nonperforming as it should beBut it does not help using a 18 or 24 bit ADC. If the design is bad and and full of noise. I think the reason for that most MCUs most often has 10 bits ADCs. Is the that internal noise make it hard to make something better and still keep the price down.
Ps Ernie I do not imply in any way that your design is noisy or bad designed. I was speaking in general terms here
In It's reading, it should be between 0 to 1023, but it usually skip a few count at the LSB, eg it might read 0, 3, 4, 5, but can't read 1 or 2.Then you need to tackle one problem at a time.
What do you mean by "my 10bit ADC in my MCU is not nonperforming as it should be"?
A voltage reference will need a lot of cap on the output, say 1.0 uf or even more, see the data sheet. They are incredibly noisy without a big cap on the output.
If your input is 0.1V max then a 2.048V ref means your max scale reading for a 10 bit A2D is only about 50 counts, so an amplifier may well be in order.
but I do need an amplifier in my next design, should have thought of that before I order I PCBThe LM4040's advanced design eliminates the need for an external
stabilizing capacitor while ensuring stability with any capacitive load, thus making the LM4040 easy to use.
I was a little too excited for my first PCB, so I went ahead and order the PCB (after a few weeks of reading PCB design, and tweaking the PCB), but I think I have learned my lesson from this mistake.By the time I do all the thinking and planning and checking to spin a PCB without building a prototype I could have built the prototype anyway, and eliminated at least one respin of the board (typically it takes me 2 to 3 spins to get it 100%).
Have you looked at your reference with a scope? Being "stable" is not the same thing as being quiet (low noise).
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