Selection of 2 microcircuits for the project

Hi 

There is a cheat sheet document for your reference. Take a look first.

Switches & Multiplexers - Cheat Sheet Document (analog.com)

Regards,

edo

Hi Student640,

For your power switch.  To start you could look at some of our load switches.  Selection Table for PowerPath, Ideal Diodes, and Load Switches | Parametric Search | Analog,  Here are the  Load switches.   

One option might be ADP1290 Datasheet and Product Info | Analog Devices , it is only one SPST switch so you will need 3 of them.  It would be worth asking this question on the Power Management forum as well.  JayBee can you comment here?  

For the Signal switch.  Its a 5V supply I see.  Initially I would recommend the ADG7xx family.  You will need to think about other parameters though, e.g. what voltage, current and frequency of signal will you pass? Is this an audio signal?  Is turn on turn off time important? Is series resistance Ron going to be a limiting factor?  Off capacitance important?  

Here is a table of parts you can start filtering on.  We don't have a triple 3:1 part.  The ADG709 is a Dual 4:1 mux, you could use 2 to them.  Having some extra switch paths can be useful.  

Selection Table for Single-Supply Analog Switches and Multiplexers | Parametric Search | Analog Devices

Regards,

Eric.

Hi EricC  

Thank you very much for the detailed answer.

EricC said:

Load switches.

Thank you, this is what I was looking for, I know that you can switch the power on transistors, but I had a feeling that there are ready-made microcircuits)

EricC said:

e.g. what voltage, current and frequency of signal will you pass? Is this an audio signal?  Is turn on turn off time important? Is series resistance Ron going to be a limiting factor?  Off capacitance important?  

this is a video signal from analog surveillance cameras. if I measured everything correctly, the signal voltage and current are very low. In my project, the switching speed is most important.

EricC said:

We don't have a triple 3:1 part.  The ADG709 is a Dual 4:1 mux, you could use 2 to them.

I looked at many multiplexers and came to the same conclusion that two chips are needed, which is bad news(

Thanks for the help it was helpful

EricC said:

Is turn on turn off time important? Is series resistance Ron going to be a limiting factor?  Off capacitance important?  

One more thing, сan you recommend a book or document to read to better understand this?

Here are some good video's we made describing basic Switch parameters.  It will help you understand more about them.  

VT1001: Basic Structure of a CMOS Switch | Analog Devices

VT1002: RON Switch On Resistance | Analog Devices

VT1003: Switch Capacitance and Leakage | Analog Devices

VT1004: Switch Charge Injection | Analog Devices

VT1005: Switch AC Parameters and Timing Specifications | Analog Devices

Here is an older app note with some good background on switches.  Worth a look.  

MT-088: Analog Switches and Multiplexers Basics

ok, so you are switching video signals. Bandwidth would also be important in this application to preserve the faster signal speeds.  edo maybe you comment.  You would need a few 100MHz of bandwidth I should think.  

Here is a basic switch that targets video applications.  ADG752 Datasheet and Product Info | Analog Devices.  Sharing so you can see the specs.  Low Ron and reasonable bandwidth would be important, it has very very fast switching speed as well.  

Maxim did some specific video switches.  Here is an example.  MAX4887 DS (analog.com)