November 17, 2018


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HandyHowie 1, cd4051bee 7 Sign up using Facebook. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms cd0451be Service. What is the range on the ADC input? 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.

What, cd451be, is A0, your analog measurement point? Is the voltage pin on the arudino 5V tolerant? Just check my comment for HandyHowie’s answer. The problem is the multiplexer has resistance, this resistance can vary from device to device I wouldn’t expect cx4051be and it does change with temperature and the amount of current through the device. Home Questions Tags Users Unanswered.

The voltage was the same to 2 decimal places 2 or 3, it doesn’t really make any difference. A voltage follower buffer might help to give you a better measurement. That might be a problem. Mt guess is that it happens due to a slightly different internal resistor for each one IC.


So I will have to check for any interference between the multiplexer and the analog input of the MCU.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Post as a guest Name. I want to test the analog inputs of a CDBE multiplexer, so I created four voltage dividers in order to measure four different values of analog input. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

I presume the problem must be in the way you are reading the analogue input. I set the select lines, wait for 50msec, make only one measurement, wait for 1 sec and then again the same loop. I just used a DVM to measure the voltage on the multiplexed pin – pin 3. I just tried it and I have to say that you are right.

analog multiplexer CDBE – Electrical Engineering Stack Exchange

Cd405b1e have five pieces of CDBE in my possession bought from the same shopso I decided to try them all. I will try it soon.


I have just repeated your test with 3 random different ICs. The ADC should be high impedance so I wouldn’t expect it to draw much current. Thank you in advance.

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What was the dwell time you used when making the analogue measurement and how many samples did you average? So I think that I should check how the cirquit reacts by adding a voltage follower buffer. You will also have common mode issues as you get near 0V. Sign up using Email and Password. If this is the case, how can a multiplexer be used for manupulation of several analog sensors, since accuracy errors occur?

Have you tested the voltage on pin 3 with a DVM to verify your results?

After that Cd4051bee read the values of each one voltage divider using the select lines, and it worked as expected. The CD is not the most accurate device, but these problems are inherent to all analog switches.

Sign up or log in Sign up using Google. That’s an interesting point. Sorry to bother you, but since my knowledge in electronics in quite limited, could you be more specific?