chip news...
So I've narrowed it down to two sensors- probably the IBIS-14000 from Cypress or the FTF-5033 from Dalsa. I like the Dalsa more- it has better fill factor, it's a newer design, and their spec sheet indicates that there's little problem with incident angles because it doesn't have microlenses. Also, you get a few more megapixels for your buck.
And in other chip news, I've found an ADC (analog to digital converter) that fits the bill- the LTC-2203 from Linear Technology. 25msps, 16 bit, 225mw of funkin'.
Other thoughts: Should I go ahead and design custom logic, or find a DSP that does what I need? Basically, the sensor sends voltages to the ADC, and the ADC spits out a datastream that should go to some high-speed ram (I'm thinking I should get a 1Gb chip, just to be excessive). Then that data needs to get written to a flash card/chip (and I'm on the fence right now as to what kind of storage to use, removable or not. Depends really on what is easier to implement). I have a feeling this kind of thing is already commercially available. No need to reinvent the wheel, and that part of the imaging chain has almost nothing to do with how the final image looks- once it's bits, it's bits, and it's not going to change.
I've decided I might need a shutter, too. I think it might be possible to get away without a mechanical one, though. If I can find one in approxamately the right size, there are those near-opaque LCDs that would be good. It only has to be 99.902% opaque to get a clean readout from a 1/2000th exposure. Which I think is doable... can't seem to find specs on any lcd's, though. it'll happen, and I'll keep you all posted.
And in other chip news, I've found an ADC (analog to digital converter) that fits the bill- the LTC-2203 from Linear Technology. 25msps, 16 bit, 225mw of funkin'.
Other thoughts: Should I go ahead and design custom logic, or find a DSP that does what I need? Basically, the sensor sends voltages to the ADC, and the ADC spits out a datastream that should go to some high-speed ram (I'm thinking I should get a 1Gb chip, just to be excessive). Then that data needs to get written to a flash card/chip (and I'm on the fence right now as to what kind of storage to use, removable or not. Depends really on what is easier to implement). I have a feeling this kind of thing is already commercially available. No need to reinvent the wheel, and that part of the imaging chain has almost nothing to do with how the final image looks- once it's bits, it's bits, and it's not going to change.
I've decided I might need a shutter, too. I think it might be possible to get away without a mechanical one, though. If I can find one in approxamately the right size, there are those near-opaque LCDs that would be good. It only has to be 99.902% opaque to get a clean readout from a 1/2000th exposure. Which I think is doable... can't seem to find specs on any lcd's, though. it'll happen, and I'll keep you all posted.
posted by matt at
11:42 PM
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