High-Frequency High-Accuracy Photodiode with Teensy 3.2?

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The AD8675 can handle ±18 V, so ±15 V has adequate margin. IMO, you need to be just as cautious with 10V as 30V.

If you need more than ~12 bits, I'd use an external ADC.
 
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I'll definitely need more than 12 bits eventually -- not right away, but eventually.

I'm researching external ADCs as an experimentation measure.

Interestingly, audio ADC's (24/192) appear to be within the price ballpark (<$10 for a 24bits 192KHz ADC isn't bad) -- such as PCM1804-Q1. And it has SPI! I wonder if I can repurpose these types of ADCs into my project. Though I'd prefer a simpler ADC than that, as that kind of precision is probably far beyond the op-amp's ENOB. The ADC wouldn't be a limiting factor anymore...
 
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bpw34 has high capacitance compared to hamamatsu diode.
if you are using chopper then make sure that you provide a nice clean square wave. it should have low inductance and capacitance.
use oscilloscope to look into circuit then compare it to adc reading in teensy. try to use Bandpass filter if problem still persist.
 
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