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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Datasheet simulate this circuit — Schematic created using CircuitLab I’ve connected the input to 5V for testing stability of the reading. I’ve experimented with various delay times, and 30ms seemed to improve things a lot when reading sequantially 0, 1, 2, I’ve tried removing the pull-down resistor.
I’m a bit lost to what the problem could be. But perhaps I can calibrate it. Your drawing does not correspond with the nomenclature of the chip.
(PDF) CD4051B Datasheet download
I’m trying to multiplex an analog input port on an Arduino Uno. 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. That is what seems to be the source of your problems.
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I did try to add a 10k resistor in series with the input, but it changed the output. Is there a better alternative?
Post as a guest Name. I imagine it could be something with capacitance on the ports, but I have the impression that the fatasheet is actually supposed to support very fast switching?
CDB Datasheet Harris Semiconductor pdf data sheet FREE from
I’ve programmed a small routine that checks for consistency of the signal reading. 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 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.
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Multiplexer CDB gives strange readings – Electrical Engineering Stack Exchange
Wouldn’t the digital pins be able to sink fast enough that the IC would mux correctly? I’ve also tried adding a 1uF capacitor. But it changes nothing. It still goes to zero. I’ve tried changing the pull-down resistor. If I read only port 4 for 30 seconds, it starts to read correctly and stable. I haven’t seen datasueet 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 connected the input to 5V for testing stability of the reading. What is the signal source that you’re reading?
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Still, I was hoping for a method that wouldn’t tamper with the input signal in any way: At the very least, connect a pullup resistor of about 10K between IN and the 5V power source. If I start reading random ports between 0 and 7it reads correctly for about 10 seconds, then suddenly starts vd4051b zero.
The is an analog multiplexer – it can switch analog signals between Vee