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I would like to know how many minimum millivolts can pass through the optocoupler, for example in a working range of 1mv to 10mV (input output) will there be problems in its operation?
Where in the LOC110 linear optocoupler data sheet is it specified?
In a simulation R5 and R4 have a maximum current of 22 uA for a transfer of 2.5V, R2 = 499omhs, R5 and R4 = 100K.
So 22uA is nowhere near 1mA
Sounds reasonable enough, the CTR from LED to photodiode is quite low, K1 & K2 are specified as typically 0.007 A/A
22 uA is a little on the low end where the part has been characterized for closed loop servo linearity:
So the operating range of the LED is from 1mA to 10mA, I have an input signal of "0 to 2.5V", so I have to scale from "1V to 2.5V" so that 1V is the minimum voltage it will give me the minimum current 1mA approximately and 2.5V the maximum current. To adjust the minimum current I will have to calculate the resistor referring to K1 until I obtain 1mA of LED current for 1V input.
Because in the schematic example it uses a "0 to 2V" input signal. It is assumed that 0V is equal to 0mA for the LED.
What if I use different voltages for VCC1=5V and VCC2=18V will it affect the K3 gain?
