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High precision and large dynamic range measurement are required in thereadout systems for the Water Cherenkov Detector Array (WCDA) in Large HighAltitude Air Shower Observatory (LHAASO). This paper presents a prototype of12-bit 40 MSPS Analog-to-Digital Converter (ADC) Application SpecificIntegrated Circuit (ASIC) designed for the readout of LHAASO WCDA. Combiningthis ADC and the front-end ASIC finished in our previous work, high precisioncharge measurement can be achieved based on the digital peak detection method.This ADC is implemented based on power-efficient Successive ApproximationRegister (SAR) architecture, which incorporates the key parts such asCapacitive Digital-to-Analog Converter (CDAC), dynamic comparator andasynchronous SAR control logic. The simulation results indicate that theEffective Number Of Bits (ENOB) with a sampling rate of 40 MSPS is better than10 bits in an input frequency range below 20 MHz, while its core powerconsumption is 6.6 mW per channel. The above results are good enough for thereadout requirements of the WCDA.

Design and simulation of a 12-bit, 40 MSPS asynchronous SAR ADC for the readout of PMT signal