  The electronics of the LZ experiment, the 7-tonne dark matter detector to be
installed at the Sanford Underground Research Facility (SURF), is designed to
permit studies of physics where the energies deposited range from 1 keV of
nuclear-recoil energy up to 3,000 keV of electron-recoil energy. The system is
designed to provide a 70% efficiency for events that produce three
photoelectrons in the photomultiplier tubes (PMTs). This corresponds
approximately to the lowest energy threshold achievable in multi-tonne
time-projection chambers, and drives the noise specifications for the front
end. The upper limit of the LZ dynamic range is defined to accommodate the
electroluminescence (S2) signals. The low-energy channels of the LZ amplifiers
provide the dynamic range required for the tritium and krypton calibrations.
The high-energy channels provide the dynamic range required to measure the
activated Xe lines.
