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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. A voltage follower buffer might help to give you a better measurement.

Is the voltage pin on the arudino 5V tolerant? Mt guess is that it happens due to a slightly different internal resistor for each one IC. The voltage was the same to 2 decimal places 2 or 3, it doesn’t really make any difference.

Sign up or log in Sign up using C4051be. After that I read the values of each one voltage divider using the select lines, and it worked as expected. The ADC should be high impedance so I wouldn’t expect it to draw much current.

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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 cd4051bbe.

What was the dwell time you used when making the analogue measurement and how many samples did you average? Thank you in advance.

HandyHowie 1, 1 7 The CD is not the most accurate device, but these problems are inherent to all analog switches. Home Questions Tags Users Unanswered. 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. So I think that I should check how the cirquit reacts by adding a voltage follower buffer.

Sign up using Email and Password. That’s an interesting point. I cd4051e five pieces of CDBE in my possession bought from the same shopso I decided to try them all.

analog multiplexer CDBE – Electrical Engineering Stack Exchange

So I will have to check for any interference between the multiplexer and the analog input of the MCU. That might be a problem. Sign up using Facebook. What is the range on the ADC input? Sorry to bother you, but since my knowledge in electronics in quite limited, could you xd4051be more specific?

Post as a guest Name. I will try it soon. I set the select lines, wait for 50msec, make only one measurement, wait for 1 sec and then again the same loop. I have just repeated your test with 3 random different ICs. I presume the problem must be in the way you are reading the analogue input.

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I just used a DVM to measure the voltage on the multiplexed pin – pin 3. 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. Have you tested the voltage on pin 3 with a DVM to verify your results? What, cd4051ne, is A0, your analog measurement point? I just tried it and I have to say that you are right.

The problem is the multiplexer has resistance, this resistance can vary from device to device I wouldn’t expect that and it does change with temperature and the amount of current through the device. By using our site, you acknowledge that you have read and understand our Cookie C4d051bePrivacy Policyand our Terms of Service. You will also ce4051be common mode issues as you get near 0V.

Cd4051br this is the case, how can a multiplexer be used for cd4051bbe of several analog sensors, since accuracy errors occur?