@aero, I'd have to do the math, but it seems to me that with 2MHz sampling rate you would have two samples to work with to get your desired resolution, and would need to determine the difference between a 10 KhZ and a 15 KHz single with samples a half microsecond apart. I would think they would be indistinguishable without a whole lot of bits of resolution, and any noise would certainly defeat you.
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