Electronics > Projects, Designs, and Technical Stuff
Analog optocoupler
ricko_uk:
Hi,
any suggestions for parts or circuits for opto-isolating two analog signals, one 0-5V and the other -/+ 5V?
I am looking for a solution without distortion at up to 30KHz (non-repetitive signal - i.e. non-sinewave).
It can amplify the signal or not, I can work around it if it does (attenuating it before or after opto-isolating).
Thank you
T3sl4co1l:
What accuracy?
Tim
ricko_uk:
Hi Tim,
Do you mean accuracy in terms of output amplitude vs input amplitude? If so then not that bothered because I can amplify/attenuate before or after.
If you mean distortion or how "identical" the o/p is to the i/p then I have no idea how to quantify/specify. My background is mostly digital and have been getting into analog only recently. :)
Benta:
Search for Broadcom (ex. HP, Avago etc.) "isolation amplifier". TI ISO124 is also an option. None of them cheap, though...
Perhaps an audio line signal transformer could be an easier solution (like earlier used for line inputs to audio amps).
ogden:
SI8920 could be used as well. Question here is: what will be done with that analog signal on the other side of isolation? Default approach in case of digital/DSP systems - converto to digital domain as soon as possible, isolate digital signals.
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