Analysis of information sources in references of the Wikipedia article "Maximum length sequence" in English language version.
A maximum-length sequence is a binary sequence whose circular autocorrelation (except for a small DC-error) is a delta function.
its RMS and peak values are both X, making its crest factor (peak/RMS) equal to 1, the lowest it can get.
The crest factor for MLS is very close to 1, so it makes sense to use this kind of input signal when we need a high signal-to-noise ratio for our measurement
Maximum-length sequence (MLS) theoretically fits the bill because it has a mathematical crest factor of 0dB, the lowest crest factor possible. However, in practice, the sharp transitions and bandwidth-limited reproduction of the signal result in a crest factor of about 8dB