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So I think that I should check how the cirquit reacts by adding a voltage follower buffer.
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. Sign up using Email and Cd4051bs.
analog multiplexer CDBE – Electrical Engineering Stack Exchange
Home Questions Tags Users Unanswered. Sign up or log in Sign up using Google. A voltage follower buffer might cd4051bbe to give you a better measurement.
Post as a guest Name. The voltage was the same to 2 decimal places 2 or 3, it doesn’t really make any difference. I just used a DVM to measure the voltage on the multiplexed cv4051be – pin 3.
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. 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. I have cd405b1e repeated your test with 3 random different ICs. I have five pieces of CDBE in my possession bought from the same shopso I decided to try them all.
The ADC should be high impedance so I wouldn’t expect it to draw much current. What was the dwell time you used when making the analogue measurement and how many samples did you average?
If this is the case, how can a multiplexer be used for manupulation of several analog sensors, since accuracy errors occur? I just tried it and I have to say that you are right. What, exactly, is A0, your analog measurement point? You will also have common mode issues as you get near 0V. The CD is not the most accurate device, but these problems are inherent to all analog switches.
Mt guess is that it happens due to a slightly different internal resistor for each one IC. What is the range on the ADC input?
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. Have you tested the voltage on pin 3 with ce4051be DVM to verify your results?