Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1979-04-09
1982-06-15
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347AD, 340347M, 364571, H03K 1308
Patent
active
043353711
ABSTRACT:
A single chip integrated circuit analog-to-digital converter uses the successive approximation approach with resistor ladder-switching decoder digital-to-analog coverters coupled to a precision plural input comparator. An on board PROM is provided to store in digital form the information necessary to trim the digital-to-analog converters. The converter is actuated during wafer probing in the manufacturing process and the PROM is programmed with the trim information. Initially, the PROM is bypassed and the digital words needed for accurate trim applied externally. Once the correct trim words are found, the PROM is programmed with the correct words. A 13-bit converter is supplied with ten 7-bit trim words to achieve a fully trimmed product in wafer fabrication.
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Connolly, Jr. Joseph J.
Frederiksen Thomas M.
Redfern Thomas P.
National Semiconductor Corporation
Schulte Neil B.
Sheridan James A.
Sloyan Thomas J.
Woodward Gail W.
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