The OLH7000 linear optocoupler consists of two LEDs in a series coupled to two PIN photodiode detectors.
The photodiode on the input side acts as a feedback device that
permits an external feedback loop to ensure constant LED light
output. A similar matching photodiode on the output side is used
to drive an output circuit that is electrically isolated from the
input. A fixed relationship is thus maintained between the input
and output, and compensates for the LED's nonlinear, time, and
temperature characteristics.
Each OLH7000 is mounted and coupled in a hermetic 8-pin
ceramic dual in-line package (DIP) that provides 1000 VDC
electrical isolation between the input and output.