I read that having a low-noise power supply is important for 14 to 16 bit ADCs. My question is how quiet is
quiet enough? Is a low-noise switcher OK, or is a linear regulator necessary? LTC (oops!) has some low-noise
switchers with 100-400uVpp output noise. Is that necessary? I'd rather use a fairly low noise topology like a
buck-boost and not have to post regulate. Are there any guidelines?