12-bit a d converter

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GLCD Designer. GLCD Developer. AWS Home. Easy Start Kit - Price :. If the engineers and not the marketing team develop the datasheet and have the final responsbilities, you are sure to get factual numbers. Marketing can quote anything and justify it. Some will average the last few bits in ADC and give you a datasheet that looks high-performing until you put them in operations. Yet, any good engineer withe experience can see within the datasheet what matters most. I have seen that the internal result of ADC was some 52 bits long but final result register is jut 24 bits.

So, there must be some averaging or some linearizing circuit present which end up giving just 24 bit result from 52 bits. Given all of these variables, it could easily be established that one successful lay out that provides twelve noise free bits from an analog signal may easily fail in another setting. You are absolutely right. PCB layout with proper definition of Analog and Digital Grounds can work better with the same chip which would otherwise perform badly.

JK — and that's another reason why those of us who are analog design engineers will always be employable — knowing the special tricks like grounding to maximize performance. Even for embedded engineers a clear understanding of grounds is necessary as mcus are increasingly becoming analog intensive. My favorite pastime is to look at how PCB tracks are routed in evaluation boards.

Many chip companies provide clear guidelines on this. JK — I agree — I used to advise customers previous job that if they studied the Eval boards, they would get a clear idea on how the do their own PC board layout.

It may be true for analog ic evaluation boards. However my experience with mixed signal mcu evaluation boards shows the PCB design was not the best of what is expected. The eval board designs were just that — allow evaluation of each of the features.

However, if one would like to do some signal processing with an eval board, the experience could be far from pleasant. But that is how must commercial ADCs are being designed.

You average the lower bits by have excess bits than required. But even the 25 bits you noted may actually be marketing bits. I have done that easily with pipelined ADC. Even SAR can give you a 12 bit system.

The challenge comes when you move into the domain of 16 bits where the resolution becomes challenging limited by the opamp performance.

Sunita, PCB design is one of the most overlooked areas inexperienced project managers can fail. Unfortunately, it is unlikely you can get any chip in operation without a board.

So board design matters in the business. Brad, yes, I agree that analog designers have more job security than digital ones. Generally, the disruption in digital is not always possible in analog as you cannot automate much in analog design. There are some some nice applications notes from the likes of Analog Devices, Maxim and TI that can also help. Do they give only 6 bit resolution? That is not the case. That must be truly excessive averaging.

Getting 24 bits from 52 seems to be over the top. That way you save power and real estate on silicon. The commenter might have pointed that when you average, you lose some effective bits of course. You must Sign in or Register to post a comment. This site uses Akismet to reduce spam. Learn how your comment data is processed.

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About Us. A little history is in order here. Bernie Gordon's paper describing his converter and a letter to George Rostky. Click here to see a larger version with all pages. Reprinted with the kind permission of Analogic. Share this: Twitter Facebook. August 15, Log in to Reply. Scott Elder. August 16, August 18, Vishal Prajapati. August 19, August 20, August 26, Sunita, You are absolutely right. BA, Even for embedded engineers a clear understanding of grounds is necessary as mcus are increasingly becoming analog intensive.