add ADR420-series voltage references in MSOP-8
https://www.analog.com/media/en/technical-documentation/data-sheets/adr420_421_423_425.pdf
Voltage reference with 4 different variants for 2.048, 2.5, 3.0 and 5.0 V.
MSOP-8 package (also available in SOIC-8)
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