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 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 also tried adding a 1uF capacitor.
But perhaps I can calibrate it. Is it possible that they are getting triggered?
Ideally something that would allow multiplexing without distorting the signal. From the Arduino wiki page, it reads “Futhermore, datasyeet 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.
Is cd405b a better alternative? I’m using digitalWrite on three pins to select the input port, and then waiting delay for 30ms before doing an analogRead on A0.
Your drawing does not correspond with the nomenclature of the chip.
I’ve tried removing the pull-down resistor. So – tell more about what is connected on the analog mux pins? This means that this chip will not work with 3.
CDB Datasheet(PDF) – TI store
I’d try using a different board. That adtasheet what seems to be the source of your problems.
(PDF) CD4051B Datasheet download
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. I’ve tried changing the pull-down resistor. Wouldn’t the digital pins be able to sink fast enough that datasheeet IC would mux correctly?
Multiplexer CDB gives strange readings – Electrical Engineering Stack Exchange
I’m a bit lost to what the problem could be. I’m trying to multiplex an analog input port on an Arduino Uno. The is an analog multiplexer – it can switch analog signals between Vee But this happens even with 1k resistor on Input 4.
Problematic breadboards cause loose connections within the board which you cannot see and hence lead to situations such as open connections etc. You show that you’ve got your “Signal” leads connected to the select inputs.
Email Required, but never shown. Sign cd0451b using Facebook. What is the signal source that you’re reading? The value then starts reading randomly. Home Questions Tags Users Unanswered. Look at page 4 of this guide. Also the pulldown resistor need not be that high.