An interesting question. Although I can't imagine what you would get. That histogram is created by turning on the VCSEL maybe a million times, catching a bunch of photons after every flash and building up the bin data.
I don't think the histogram would have any meaning if you just started capturing photons.
ST makes the SPAD array and we would be overjoyed to build an array for you. Initial cost is kind of high though.
I think it's a million or two dollars for the first 5 wafers.
So it has to be a REALLY high volume application to make it worth it.
The thing that makes this chip work is the tight coupling of the VCSEL driver and the SPAD array. I'm afraid if you decoupled these elements, it would be extremely hard to get the timing right.
But if that is what you really wanted to do, I expect we could find some way to disable the VCSEL.
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- john
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