Data sheet acquired from Harris Semiconductor. SCHSD. CAUTION: The CDB, CDB, and CDB analog multiplexers are digitally-controlled . Product data sheet. Rev. 12 — 25 March 4 of Nexperia. HEFB. 8- channel analog multiplexer/demultiplexer. Fig 5. Logic diagram. An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in . Product Folder Links: CDB CDB CDB.

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This means that this chip will not work with 3. The Arduino has about 10Mohm resistance on the input side, so it shouldn’t make a difference, but the max reading was about instead of It still goes to zero.

I’m a bit lost to what dd4051b problem could be. Look at page 4 of this guide. Problematic breadboards cause loose connections within the board which you cannot see and hence lead to situations such as open connections etc.

CDB from Texas Instruments

Post as a guest Name. If I read only port 4 for 30 seconds, it starts to read correctly and stable. 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.

I’ve connected the input to 5V for testing stability of the reading. LawrenceNK1G, I’m going to read a lot of things, like pots, voltage dividers etc. Email Required, but never shown. I haven’t seen the block diagram for the chip but it seems that you may be shorting something internally inside the chip which is why the input drops to 0V after a short time.


I’ve programmed a small routine that checks for consistency of the signal reading. Though this may not be very relevant in this case, its important to note that the B is a CMOS device and hence anything less than 1.

Is there a better alternative? A 10K resistor works well in most cases. Your drawing does not correspond with the nomenclature of the chip. Wouldn’t the digital pins be able to sink fast enough that the IC would mux cd051b Also the pulldown resistor need not be that high.

So – tell more about what is connected on the analog mux pins?

CDB Datasheet(PDF) – TI store

What is the signal source that you’re reading? I’ve experimented with various delay times, and 30ms seemed to improve things a lot when reading sequantially 0, 1, 2, dd4051b If I start reading random ports datashwet 0 and 7it reads correctly for about 10 seconds, then suddenly starts reading zero. But perhaps I can calibrate it. Datasheet simulate this circuit — Schematic created using CircuitLab I’ve connected the input to 5V for testing stability of the reading. I’ve tried changing the pull-down resistor.

At the fd4051b least, connect a pullup resistor of about 10K between IN and the 5V power source. From the Arduino wiki page, it reads “Futhermore, the is able to work with analog values; in the case of the Arduino, you are able to use the analog inputs with a voltage between V and route them to an Analog-In Pin on your Arduino.


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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I’m using a breadboard of questionable quality.

I imagine it could be something with capacitance on the ports, but I have the impression that the multiplexer is actually supposed to support very fast switching?

Ideally something that would allow multiplexing without distorting the signal. That is what seems to be the source of your problems. You show that you’ve got your “Signal” leads connected to the select inputs. The is an datssheet multiplexer – it can switch analog signals between Adtasheet Is it possible that they are getting triggered?

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But the documentation on their website is generally incredibly poor, so I wouldn’t be surprised. I’d try using a different board.