ColdADC_P2: A 16-Channel Cryogenic ADC ASIC for the Deep Underground Neutrino Experiment

• Published in: IEEE transactions on nuclear science Vol. 69; no. 1; pp. 105 - 112
• Main Authors: Grace, C., Braga, D., Chen, H., Christian, D., Dabrowski, M., Deptuch, G., Dwyer, D., Fried, J., Gao, S., Hoff, J., Holm, S., Lin, C.-J., Lopriore, E., Lu, Y., Luk, K.-B., Miryala, S., Prakash, T., Richardson, H., Shenai, A., Tarpara, E., Vernon, E., Zhang, J.
• Format: Journal Article
• Language: English
• Published: New York The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 01-01-2022; Institute of Electrical and Electronics Engineers
• Subjects: Acidity; Analog to digital converters; Application specific integrated circuits; Argon; Crosstalk; Digitization; Neutrinos; Sodium channels
• ISSN: 0018-9499; 1558-1578
• DOI: 10.1109/TNS.2021.3136404

The second and final version of ColdADC, called ColdADC_P2, is presented. ColdADC_P2 is a 16-channel, 12-bit, 2 MS/s digitizer application-specific integrated circuit (ASIC) intended for use inside the DUNE Far Detector. ColdADC_P2 contains two 16 MS/s pipelined analog-to-digital converters (ADCs) that each digitizes the output of eight sample-and-hold amplifiers (SHAs). Because the application requires immersion in liquid argon (LAr), ColdADC_P2 was developed using specialized design techniques for long-term reliability in cryogenic environments and a customized cryogenic standard cell library. ColdADC_P2, with a die area of approximately 52.4 mm2 and fabricated in 65-nm CMOS technology, achieves 130-[Formula Omitted] rms noise performance and 11.8-bit effective-number-of-bits (ENOB) at a temperature of 77 K, with channel-to-channel crosstalk of