Published by on January 17, 2020
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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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The Arduino has about 10Mohm resistance on the input side, so it shouldn’t make a difference, but the max reading catasheet about instead of This means that this chip will not work with 3.

But the documentation on their website is generally incredibly poor, so I wouldn’t be surprised. I’m using a breadboard of questionable quality. I’ve programmed a small routine that checks for consistency of the signal reading.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I’m using digitalWrite on three pins to select the input port, and then waiting delay for 30ms before doing an analogRead on A0.

Datasheet simulate this circuit — Schematic created using CircuitLab I’ve connected the input to 5V for testing stability of the reading. Sign up using Facebook. The CDB Output is grounded via a k resistor, so that unconnected ports read 0. Sign up or log in Sign up using Google. I’ve connected the input to 5V for testing stability of the reading. Wouldn’t the digital pins be able to sink fast enough that the IC would mux correctly?

(PDF) CD4051B Datasheet download

I imagine it could be something with capacitance on the ports, but I have the impression that datsaheet multiplexer is actually supposed to support very fast switching? The is an analog multiplexer – it can switch analog signals between Vee If I datashert reading random ports between 0 and 7it reads correctly for about 10 seconds, then suddenly starts reading zero. Sign up using Email and Password. I did try to add a 10k resistor in series with the input, but it changed the output.


CDB from Texas Instruments

I’ve experimented with various delay times, and 30ms seemed to improve things a lot when reading sequantially 0, 1, 2, A 10K resistor works well in most cases. The value then starts reading randomly. I’m a bit lost to what the problem could be.

Also the pulldown resistor need not be that high. Is there a better alternative? If I read only port 4 for 30 seconds, it starts to read correctly and stable.

Datasheets search archive of electronic components datasheets

I’ve tried changing the pull-down resistor. The IC has internal protection circuits. Post as a guest Name.

I saw a comment on the ‘arduino’ board which datashret that “the for loop repeatedly cycles count from 0 to 7, so [selector pins] will average 2. I’ve also tried adding a 1uF capacitor. Is it possible that they are getting triggered? However, the control inputs require CMOS digital levels.

Your drawing does not correspond with the nomenclature of the chip. What is the signal source that you’re reading?

Multiplexer CDB gives strange readings – Electrical Engineering Stack Exchange

Email Required, but never shown. 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. Still, I was hoping for a method that wouldn’t tamper with the input signal in any way: You show that you’ve got your “Signal” leads connected to the select inputs. By clicking “Post Your Answer”, you acknowledge that you have read our updated datazheet of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


It still goes to zero. I’ve tried removing the pull-down resistor. But perhaps I can calibrate it. Look at page 4 of this guide.

I’m trying to multiplex an analog input port on an Arduino Uno. So – tell more about what is connected on the analog mux pins? But it changes nothing. I’d try using a different board. LawrenceNK1G, I’m going to read a lot of things, like pots, voltage dividers etc.

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 cd405b1 an Analog-In Pin on your Arduino.

Problematic breadboards cause loose connections within the board which you cannot see and hence lead to situations such as open connections etc.

That is what seems datashet be the source of your problems. But this happens even with 1k resistor on Input 4.

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 datashwet to 0V after a short time. At the very least, connect a pullup resistor of about 10K between IN and the 5V power source.