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Photodiode Monitor Current Range should be Selectable #45

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opened 2024-06-12 11:01:10 +08:00 by linuswck · 0 comments
linuswck commented 2024-06-12 11:01:10 +08:00
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Hardware Revision: Rev0_3

Description:
Laser diode's integrated photodiode (PD) monitor (Mon) can have very different responsivity. STM32F407 ADC's resolution is 12bit (805.6640nA/LSB in 0-3.3mA Full range). This current resolution is not enough for laser diode with a small PD Mon full range.

Therefore, PD Mon Circuit's gain should be configurable. This can be achieved with Pin/Digitally Programmable Gain Amplifier (such as TI's PGA308) or simply some selectable gain resistor.

Hardware Revision: Rev0_3 Description: Laser diode's integrated photodiode (PD) monitor (Mon) can have very different responsivity. STM32F407 ADC's resolution is 12bit (805.6640nA/LSB in 0-3.3mA Full range). This current resolution is not enough for laser diode with a small PD Mon full range. Therefore, PD Mon Circuit's gain should be configurable. This can be achieved with Pin/Digitally Programmable Gain Amplifier (such as TI's PGA308) or simply some selectable gain resistor.
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Reference: sinara-hw/kirdy#45
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