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. Ideally something that would allow multiplexing without distorting the signal. Home Questions Tags Users Unanswered. LawrenceNK1G, I’m going to read a lot of things, like pots, voltage dividers etc. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge ce4051b 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 saw a comment on the datasheeg board which said datsaheet “the for loop repeatedly cycles count from 0 to 7, so [selector pins] will average 2.

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 I’ve also tried adding a 1uF capacitor. Still, I was hoping for a method that wouldn’t tamper with the input signal in any way: If I read only port 4 for 30 seconds, it starts to read correctly and stable.

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 tried changing the pull-down resistor. At the very least, connect a pullup resistor of about 10K between IN and the 5V power source.


Cd44051b still goes to zero.

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I’m trying to multiplex an analog input port on an Arduino Uno. Though this may not be cd405b relevant in this case, its important to note that the B is a CMOS device and hence anything less than 1. I’m using digitalWrite on three pins to select the datashret port, and then waiting delay for 30ms before doing an analogRead on A0.

From the Arduino wiki page, it reads “Futhermore, the is able to work dtasheet 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.

But this happens even with 1k resistor on Input 4. Sign up using Facebook. I did try to add a 10k resistor in series with the input, but it changed the output.

You show that you’ve got your “Signal” leads connected to the select inputs. But the documentation on their website is generally incredibly poor, so I wouldn’t be surprised. If I start reading random ports between 0 and 7it reads correctly for about 10 seconds, then suddenly starts reading zero.

I’ve connected the input to 5V for testing stability of the reading. The value then starts reading randomly. I’ve tried removing dataaheet pull-down resistor. However, the control inputs require CMOS digital levels.

(PDF) CD4051B Datasheet download

Problematic breadboards cause loose connections within the board which you cannot see and hence lead to situations such as open connections etc. I’d try using a different board. Look at page 4 of this guide. The IC has internal protection circuits.


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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. But perhaps I can calibrate it. Is there a better alternative? Wouldn’t the digital pins be able to sink fast enough that the IC would mux correctly?

I’m using a breadboard of questionable quality. Your drawing does not correspond with the nomenclature of the chip. What is the signal source that you’re reading? By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Is it possible that they are getting triggered? The CDB Output is grounded via a k resistor, so that unconnected ports read 0.

Multiplexer CDB gives strange readings – Electrical Engineering Stack Exchange

I’m a bit lost to what the problem cd4501b be. Sign up or log in Sign up using Google. I’ve experimented with various delay times, and 30ms seemed to improve things a lot when reading sequantially 0, 1, 2, I’ve programmed a small routine that checks for consistency of the signal reading. A 10K resistor works well in most cases. Email Required, but never shown.