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Sachin Gupta & Akshay Phatak

ADC Guide, Part 12: Input Configurations; Single-Ended & Differential Input ADCs

Sachin Gupta
CameronRobertson
CameronRobertson
9/20/2018 4:11:33 AM
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Newbie
Re: CM rejection in ADC's
I had a good time reading this whole series. I'm most likely going to have go back a number of times to make sure that I've absorbed all the information properly before I can start to apply all the things I've learnt. Just want to take the opportunity to thank you all for putting this all down so concisely! I'm sure that I'm not the only one who will appreciate this resource for their work in the future! 

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jack90
jack90
3/8/2014 2:26:07 AM
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Newbie
Re: CM rejection in ADC's
There is a pertinacious dilemma absent there about the conflict among alone-over moreover differential analog input shapes. Specifically, numerous receive the image that analog inputs configured to be  sole past cannot mete film going voltages inputs.

freelance editor needed

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Brad Albing
Brad Albing
4/1/2013 8:44:25 PM
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Blogger
Re: CM rejection in ADC's
Go here for a bit more info on the CMRR issue of which Michael speaks:

http://www.planetanalog.com/author.asp?section_id=434&doc_id=558824

 

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Tucson_Mike
Tucson_Mike
4/1/2013 12:40:45 PM
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Blogger
CM rejection in ADC's
The CM rejection thread is basically true but kind of a small part of the differential input virtues of modern ADC inputs. Also, if you are thinking EMI kind of issues, ADC's do not have infinite CM rejection and in fact roll off with increasing frequency - a plot not always included in modern high speed ADC's.

 

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Brad Albing
Brad Albing
3/24/2013 9:16:00 PM
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Blogger
Re: Re : ADC Guide, Part 12: Input Configurations; Single-Ended & Differential Input ADCs
Um, well, yes, but I think you're saying pretty much just what the authors said in the blog (above) regarding the principal of common mode rejection.

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SunitaT0
SunitaT0
3/13/2013 5:53:19 AM
User Rank
Master
Re : ADC Guide, Part 12: Input Configurations; Single-Ended & Differential Input ADCs
In differential ADCs, both input signals are physically run in parallel with each other. Thus the same amount of noise gets coupled into both the signals.

Differential parallel lines needs to be closely coupled to reduce the effect of noise. Also it will reduce the effect of electromagnetic interference(EMI). EMI acts as a common-mode noise that appears as a commonmode voltage at the ADC input. The ADC responds only to the difference between the inputs, so when the noise appears commonly to both inputs, the input differential signal amplitude is undisturbed.

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More Blogs from Sachin Gupta & Akshay Phatak
In this installment, we’ll see how to design an interfacing circuit for a given signal source to match the output impedance of the source to the input impedance of the ADC. This process is referred as impedance matching.
In the previous part of this series we looked at differential vs. single-ended drive methods for the ADC. This installment of the series looks at ADC input impedance and the effect it has on accuracy.
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