Electronics > Projects, Designs, and Technical Stuff
Analog optocoupler
StillTrying:
If I read this with the very similar thread: https://www.eevblog.com/forum/projects/optically-transparent-electrical-isolation-of-analog-signal/
Opto-isolation might not be needed to get enough RF shielding.
David Hess:
My first recommendation is the Analog Devices ADUM3190 which is inexpensive for a complete isolation amplifier. My second would be circuit based on the IL300 linear optocoupler. Anything else would be a lot more involved.
ricko_uk:
Woow, thank you all for so much info!! :)
I need to go through it all and get back with answers to the various questions.
In the meantime thank you again! :)
vk6zgo:
Such devices were fairly commonly available back in the 1980s, as an alternative to the classic, "coax wound around a ferrite ring" 'hum bucking coils' often used in TV OBs.
The disadvantage for that use compared to the latter is that they need a power source.
The ones I saw were good to well above 5MHz (PAL video), & maintained the DC component of the signal.
ricko_uk:
Thank you all! :)
Tim,
Apologies for the delay in replying but have been quite busy.
Ref that is it for: I want to achieve two things 1) optocouple two boards and 2) transfer the analog signal from the more noisy (digital and SMPS) PCB to the more silent analog PCB reducing the amount of noise transferred as much as possible
And thank you for the long detailed explanation! Always appreciated!! :)
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