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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I’ve tried removing the pull-down resistor. This means that this chip will not work with 3. Still, I was hoping for a method that wouldn’t tamper with the input signal in any way: I’ve also tried adding a 1uF capacitor.

I’d try using a different board. Problematic breadboards cause loose connections within the board which you cannot see and hence lead to situations such daasheet open connections etc.

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Wouldn’t the digital pins be able to sink fast enough that the IC would mux correctly? I’m using digitalWrite on three pins to select the input port, and then waiting delay for 30ms before doing an analogRead on A0.

CDB Datasheet(PDF) – TI store

The is an analog multiplexer – it can switch analog signals between Vee Sign up using Email and Password. I did try to add a 10k resistor in series with the input, but it changed the output.

But it changes nothing. But perhaps I can calibrate it. Ideally something that would allow multiplexing without distorting the signal. Also the pulldown resistor need not be that high.

I’ve tried changing the pull-down resistor. I saw a comment on the ‘arduino’ board which said that “the for loop repeatedly cycles count from 0 to 7, so [selector pins] will average 2. A 10K resistor works well in most cases. LawrenceNK1G, I’m going to read a lot of things, like pots, voltage dividers etc.

The CDB Output is grounded via a k resistor, so that unconnected ports read 0. 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 this happens even with 1k datqsheet on Input 4.


Home Questions Tags Users Unanswered. 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’m trying to multiplex an analog input port on an Arduino Uno. So – tell more about what is connected on the analog mux pins? Sign up using Facebook. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge ratasheet you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Multiplexer CDB gives strange readings – Electrical Engineering Stack Exchange

At the very least, connect a pullup resistor of about 10K cx4051b IN and the 5V power source. Look at page 4 of this guide. 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? The value then starts reading randomly.