CMOS analog Switch vs. Solid state relay

[nolsqn86]

Hi guys,

I wanted to ask a general question whats the difference between CMOS analog switch and a SSR ? by difference i dont mean working principle , i want to know that both can be used for analog signals but which is better ?

Acutally I am trying to make a multiplexer for a sensor system for which I need to measure electrical paramters (RCL) using an agilent LCR meter. I already did it for a single sensor but now I want to integrate more sensors so I am thinking of using 16:1 mux. Upon reading online mostly all the mux have cmos switches inside with very low on-resistance and leakage current. My voltage limits are also not that exterme as for measurements I use 0.1 volts to calculate all the parameters.

so my main questions are
1. Is it a good approach to use mux to integrate more than one sensors and digitally controlling it one by one take the measurements.
2. there are SSR multiplexers also available , which is better low cost cmos mux or SSR in terms of performance, also i would mention my operating frequncy is alos 40K to 48K so I am not worried about high frequncy

Best Regard
AA

 

[dick_freebird]

The main virtues of SSRs are isolation and higher working
voltages - however many SSRs work only on reversing /
AC waveforms (the opto SCR / TRIAC types). An analog
mux ought to be fine if all of the voltages are on one
ground or can be counted on to remain within the stated
off-voltage limits, and no safety isolation concerns exist.

 

[crutschow]

1. CMOS analog switches are used to switch low level analog signals and are what you want use to multiplex your sensor signals. That's a common application for analog multiplexers.

2) SSRs are used to control AC or DC power. So I don't understand your reference to an SSR multiplexer(?).

- - - Updated - - -

however many SSRs work only on reversing /
AC waveforms (the opto SCR / TRIAC types). ........................

Yes, most of the SSRs are SCR/Triac types that operate only to control AC but there are opto/MOSFET type isolated SSRs that can switch either AC or DC.

 

[nolsqn86]

hey guys thanks for the reply I would go with Analog multiplexers also I have some other design question but I will post them on a new thread.

Thanks once again