PDX10R User Guide

Quickstart

1. Supply VCC pin with 5 V.

2. Illuminate the photodetectors with a maximum of 4 mW optical power per photodiode.

3. (Optional) Set log A/B offset with the potentiometer. Set log A/B gain with the jumpers x1, x10.

4. The outputs are available on the terminal block.

Output voltage versus input optical power

The voltage V_out at the logarithmic amplifier output is related to the input optical power P_in according to

V_out = V_Y log₁₀(S P_in / I_Z),

where V_Y = 300 mV/decade is the logarithmic slope, I_Z = 100 pA is the intercept current, and S is the photodiode responsivity (0.55 A/W at 800 nm).