I'm trying to figure out how to use an ALS-PT19-315C/L177/TR8 phototransistor (or something like it).
The datasheet has this sample circuit for converting current to voltage so that I can measure it with an IC.
What does CL do? How do I select the appropriate value for it? I've also seen similar circuits where there is no CL so I assume it's optional and for filtering/smoothing maybe?
The datasheet further describes the relationship with the capacitor:
Vout(max.) = IPH(max.) × RL ≦ Vout(saturation)＝Vcc－0.4V
RL × CL ≧ 0.5 (empirical data)
What does the part about RL x CL ≧ 0.5 mean?