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.
|Published (Last):||14 July 2009|
|PDF File Size:||20.54 Mb|
|ePub File Size:||14.43 Mb|
|Price:||Free* [*Free Regsitration Required]|
Still, I was hoping for a method that wouldn’t tamper with the input signal in any way: I did try to add a 10k resistor in series with the input, but it changed the output. I’m a bit lost to what the problem could be.
(PDF) CDB Datasheet PDF Download – CMOS Analog Multiplexers / Demultiplexers
At the very least, connect a pullup resistor of about 10K between IN and the 5V power source. The value then starts reading randomly. Home Questions Tags Users Unanswered. So – tell more about what is connected on the analog mux pins? Post as a guest Name. LawrenceNK1G, I’m going to read a lot of things, like pots, voltage dividers etc. The IC has internal protection circuits.
Email Required, but never shown. 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? Wouldn’t the digital pins be able to sink fast enough that the IC would mux correctly? However, the control inputs require CMOS digital levels.
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.
Also the pulldown resistor need not be that high. Is it possible that they are getting triggered?
I’ve tried changing the pull-down resistor. It still goes to zero.
Multiplexer CDB gives strange readings – Electrical Engineering Stack Exchange
I’m trying to multiplex an analog input port on an Datashfet Uno. If I start reading random ports between 0 and 7it reads correctly for about 10 seconds, then suddenly starts reading zero. But the documentation on their website is generally incredibly poor, so I wouldn’t be surprised. But perhaps I can calibrate it.
I’ve tried removing the pull-down resistor. Ideally something that would allow multiplexing without distorting the signal. But it changes nothing. Your drawing does not correspond cd4051 the nomenclature of the chip. But this happens even with 1k resistor on Input 4. 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.
Is there a better alternative? Sign up using Email and Password. What is cd4051g signal source that you’re reading? Problematic breadboards cause loose connections within the board which you cannot see and hence lead to situations dstasheet as open connections etc.
Look at page 4 of this guide.
Datasheets search archive of electronic components datasheets
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. That is what seems to be the source of your problems. You show that you’ve got your “Signal” leads connected to the select inputs. Sign up cd405b log in Sign up using Google.