CD4051B DATASHEET PDF

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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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Also the pulldown resistor need not be that high. I did try daasheet add a 10k resistor in series with the input, but it changed the output.

The IC has internal protection circuits. Sign up or log in Sign up using Google. However, the control inputs require CMOS digital levels. I’ve connected the input to 5V for testing stability of the reading. Problematic breadboards cause loose connections within the board which you cannot see and hence lead to situations such as open connections etc. Look at page 4 of this guide.

Email Required, but never shown. Though this may not be very relevant in this case, its important dqtasheet note that the B is a CMOS device and hence anything less than 1.

But perhaps I can calibrate it. At the very least, connect a pullup resistor of about 10K between IN and the 5V power source. The value then starts reading randomly.

Wouldn’t the digital pins be able to sink fast enough that the IC would mux correctly? I’ve programmed a small routine that checks for consistency of the signal reading. I’ve tried removing the pull-down resistor. I’ve also tried adding a 1uF capacitor. Sign up using Email and Password.

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Post as a guest Name. 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, So – tell more datashedt what is connected on the analog mux pins?

Your drawing does not correspond with the nomenclature of the chip. You show that you’ve got your “Signal” leads connected to the select inputs. I’m trying to multiplex an analog input port on an Arduino Uno. Datasheet simulate this circuit — Schematic created using CircuitLab I’ve connected the input to 5V for testing stability of the reading.

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But this happens even with 1k resistor on Input 4.

I’m using a breadboard of questionable quality. 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 cd401b your Arduino. Is there a better alternative? If I read only port 4 for 30 seconds, it starts to read cv4051b and stable.

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CDB Datasheet(PDF) – TI store

LawrenceNK1G, I’m going to read a lot of things, like pots, voltage dividers etc. That is what seems to be the source of your problems. The CDB Output is grounded via a k resistor, so that unconnected ports read 0. 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. Ideally something that would allow multiplexing without distorting the signal.

I’d try using a different board. But it changes nothing. I’m a bit lost to what the problem could be. A 10K resistor works well in most cases. If I start reading random ports between 0 and 7it reads correctly for about 10 seconds, then suddenly starts dafasheet zero. By clicking “Post Your Answer”, you acknowledge that you have read our datwsheet terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

I’m using digitalWrite on three pins to select the input port, and then waiting delay for 30ms before doing an analogRead on A0. It still goes to zero. I imagine it could be something with capacitance on the dayasheet, but I have cd4051bb impression that the multiplexer is actually supposed to support very fast switching?

The is an analog multiplexer – it can switch datadheet signals between Vee Still, I was hoping for a method that wouldn’t tamper with the input signal in any way: 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 Home Questions Tags Users Unanswered.