I plan to use an optocoupler for isolated analog signal transmission. I looked at the datasheet of SFH617A2. The problem is the current transfer ratio is too much temperature dependant. When Temp rise from 25Degree to 50degree the CTR changes %35-%40.
Linear optocouplers are alternative but they require an isolated power supply on input (because of opamps circuitary).
Is there a less temperature dependant alternatives to SFH617.