Resolution of an Analog Multiplexer?

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21

lynes:
and this:

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Website with more details:
https://bildr.org/page/18/

You are looking at the wrong image. :astonished: The green arrow coming out of the bottom of the board is what you connect to your actual ADC input, as shown on the adjacent diagram:

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In which case you are using the resolution of the ATmega328 ADC, 10 bits.

Note that these multiplexers are as raschemmel points out, a sort of "rotary switch". Amongst the things you have to take into consideration are the fact that the "switch" contains a series resistance of about 60 Ohms and various capacitances.

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270 ohms

23

You are correct. I was quoting for the full-spec version - the 74HC4067. That board shows the inferior older part.

24

Hi,
How often do you want to read these 48 inputs?
Are you aware that if you use the UNO ADC you will probably have to read each analog input twice to get a stable value?

Tom... :slight_smile:

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I can't seem to catch up to you