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ADC08034 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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ADC08034 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 24 page ADC08038 Functional Block Diagram Functional Description 1.0 MULTIPLEXER ADDRESSING The design of these converters utilizes a comparator struc- ture with built-in sample-and-hold which provides for a differ- ential analog input to be converted by a successive- approximation routine. The actual voltage converted is always the difference be- tween an assigned “+” input terminal and a “−” input terminal. The polarity of each input terminal of the pair indicates which line the converter expects to be the most positive. If the as- signed “+” input voltage is less than the “−” input voltage the converter responds with an all zeros output code. A unique input multiplexing scheme has been utilized to pro- vide multiple analog channels with software-configurable single-ended, differential, or pseudo-differential (which will convert the difference between the voltage at any analog in- put and a common terminal) operation. The analog signal conditioning required in transducer-based data acquisition systems is significantly simplified with this type of input flex- ibility. One converter package can now handle ground refer- enced inputs and true differential inputs as well as signals with some arbitrary reference voltage. A particular input configuration is assigned during the MUX addressing sequence, prior to the start of a conversion. The MUX address selects which of the analog inputs are to be www.national.com 10 |
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