formed by common components 4 input 12-bit A-D converter diagram

Published:2011/5/11 3:23:00 Author:Fiona | Keyword: formed by common components, 4 input | From:SeekIC

Circuit function Recently, there is a variety of general-purpose AD conversion expansion board as a personal computer expanded with being sold on the market , if limited specific use, production costs can be low. This circuit is a 12-bit AD converterusing in sample and hold circuits which is composed of the universal element and 4 inputs. It can enter positive and negative analog signals. Circuit work Analog input mux using the standard analog switch DG201, chooses 1~4 channel with decoder IC , channel selection input control by the two positive logic. After selecting channel, input about 10US wide sampling pulse to the sample and hold circuit to keep the analog voltage.The pulse starts to pulse by the AD pulse, using the pulse rising edge to begin 12-bit conversion. The conversion time is about 25US, 12-bit data output from D0 ~ D11. About EOC signal: when A-D conversion starts, EOC is H level and count the clock pulse.After conversion, EOC is back L level, so we can use the method of detecting EOC signai's rising and falling to read the slide 12-bit data. Component selection



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