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The Cherenkov Telescope Array (CTA) is the next generation ground-based veryhigh energy gamma-ray observatory. The Large-Sized Telescope (LST) of CTAtargets 20 GeV -- 1 TeV gamma rays and has 1855 photomultiplier tubes (PMTs)installed in the focal plane camera. With the 23 m mirror dish, the night skybackground (NSB) rate amounts to several hundreds MHz per pixel. In order torecord clean images of gamma-ray showers with minimal NSB contamination, a fastsampling of the signal waveform is required so that the signal integration timecan be as short as the Cherenkov light flash duration (a few ns). We havedeveloped a readout board which samples waveforms of seven PMTs per board at aGHz rate. Since a GHz FADC has a high power consumption, leading to large heatdissipation, we adopted the analog memory ASIC "DRS4". The sampler has 1024capacitors per channel and can sample the waveform at a GHz rate. Four channelsof a chip are cascaded to obtain deeper sampling depth with 4096 capacitors.After a trigger is generated in a mezzanine on the board, the waveform storedin the capacitor array is subsequently digitized with a low speed (33 MHz) ADCand transferred via the FPGA-based Gigabit Ethernet to a data acquisitionsystem. Both a low power consumption (2.64 W per channel) and high speedsampling with a bandwidth of $>$300 MHz have been achieved. In addition, inorder to increase the dynamic range of the readout we adopted a two gain systemachieving from 0.2 up to 2000 photoelectrons in total. We finalized the boarddesign for the first LST and proceeded to mass production. Performance ofproduced boards are being checked with a series of quality control (QC) tests.We report the readout board specifications and QC results.

Development of the photomultiplier tube readout system for the first Large-Sized Telescope of the Cherenkov Telescope Array