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That’s an interesting point.
I have five pieces of CDBE in my possession bought from the cd4051b shopso I decided to try them all. Is the voltage pin on the arudino 5V tolerant? A voltage follower buffer might help to give you a better measurement.
I just tried it and I have to say that you are right. Sign up using Facebook. In each case, the voltage on pin 3 was the same to 3 decimal places and was the same as the voltage on the potential divider on the input. If this xd4051be the case, how can a multiplexer be used for manupulation of several analog sensors, since accuracy errors occur?
The CD is not the most accurate device, but these problems are inherent to all analog switches. I want to test the cd4501be inputs of a CDBE multiplexer, so I created four voltage dividers in order to measure four different values of analog input. After that I read the values of each one voltage divider using the select lines, and it worked as expected. So I think that I should check how the cirquit reacts by adding a voltage follower buffer.
HandyHowie 1, 1 7 Have you tested the voltage on pin 3 with a DVM to verify your results? So I will have to cd40051be for any interference between the multiplexer and the analog input of the MCU. I have just repeated your test with 3 random different ICs.
What, exactly, is A0, your analog measurement point?
You will also have common mode issues as you get near 0V. I presume the problem must be in the way you are reading the analogue input. Sign up or log in Sign up using Google. Thank you in advance. What was the dwell time you used when making the analogue measurement and how many samples did you average?
Sorry to bother you, but since my knowledge in electronics in quite limited, could you be more specific? What is the range on the ADC input?
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analog multiplexer CDBE – Electrical Engineering Stack Exchange
Mt guess is that it happens due to a slightly different internal resistor for each one IC. The ADC should be cd4051ne impedance so I wouldn’t expect it to draw much current.
That might be a problem. Sign up using Email and Password. Home Questions Tags Users Unanswered. I will try it soon. I just used a Cx4051be to measure the voltage on the multiplexed pin – pin 3.