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OPA320: Designing a transimpedance amplifier for a phototransistor using OPA320

Part Number: OPA320
Other Parts Discussed in Thread: TINA-TI

Hi Team,
We are using the phototransistor ALS-PT204-6C/L177 in one of our applications to measure the ambient light.

From the dataset of the phototransistor,

In our case, VCC is 3.3V.
What changes do we need to make in the following circuit in the application note TIDU535 to make the circuit suitable for a phototransistor?.


The dark current of the phototransistor is 100nA and the photocurrent is 3.6mA, I need my output in the range of 0V to 3.2V.