LTSpice Modell of DC1858A

Hello Community,

for my Bachelorthesis i need to modify the DC1858A-Unit for different frequencies and amplitudes.
For verification i want to simulate the results in LTSpice. I recreated the circuit from the schematic but cant find a model for the VTL5C10 optocoupler. So at the moment my oscillator is working but none of the AGC.

Can you help me out with this?