  The pixel detectors for the High Luminosity upgrades of the ATLAS and CMS
detectors will preserve digitized charge information in spite of extremely high
hit rates. Both circuit physical size and output bandwidth will limit the
number of bits to which charge can be digitized and stored. We therefore study
the effect of the number of bits used for digitization and storage on single
and multi-particle cluster resolution, efficiency, classification, and particle
identification. We show how performance degrades as fewer bits are used to
digitize and to store charge. We find that with limited charge information (4
bits), one can achieve near optimal performance on a variety of tasks.
