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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CDB from Texas Instruments
At the very least, connect a pullup resistor of about 10K between IN and the 5V power source. So – tell more about what is connected on the analog mux pins? I’ve tried removing the pull-down resistor.
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. Sign up using Email and Password. I’d try using a different board.
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 However, the control inputs require CMOS digital levels.
I’ve connected the input to 5V for testing stability of the reading. I’m trying to multiplex an analog input port on an Arduino Uno. Sign up or datasheeet in Sign up using Google. What is the signal source that you’re reading? I’m a bit daasheet to what the problem could be. Datasheet simulate this circuit — Schematic created using CircuitLab I’ve connected the input to 5V for testing stability of the reading. I’ve programmed a small routine that checks for consistency of the signal reading.
(PDF) CD4051B Datasheet download
But perhaps I can calibrate it. Look at page 4 of this guide.
Your drawing does not correspond with the nomenclature of the chip.
Also the pulldown resistor need not be that high. Post cd405b a guest Name. Ideally something that would allow multiplexing without distorting the signal.
You show that you’ve got your “Signal” leads connected to the select inputs.
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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 on your Arduino. Sign up using Facebook. The value then starts reading randomly. The CDB Output is grounded via a k resistor, so that unconnected ports read dagasheet.
Problematic breadboards cause loose connections within the board which you cannot see and hence lead to situations such as open connections etc. But it changes nothing.
I’ve experimented with various delay times, and 30ms seemed to improve cf4051b a lot when reading sequantially 0, 1, 2, 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 datashee 0V after a short time.
Multiplexer CDB gives strange readings – Electrical Engineering Stack Exchange
LawrenceNK1G, I’m going to read a lot of things, like pots, voltage dividers etc. A 10K resistor works well in most cases. Is there a datasheett alternative? The is an analog multiplexer – it can switch analog signals between Vee This means that this chip will not work with 3.