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ADC0809CCV Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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ADC0809CCV Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 14 page Typical Performance Characteristics TRI-STATE Test Circuits and Timing Diagrams Applications Information OPERATION 1.0 RATIOMETRIC CONVERSION The ADC0808, ADC0809 is designed as a complete Data Acquisition System (DAS) for ratiometric conversion sys- tems. In ratiometric systems, the physical variable being measured is expressed as a percentage of full-scale which is not necessarily related to an absolute standard. The voltage input to the ADC0808 is expressed by the equation (1) V IN=Input voltage into the ADC0808 V fs=Full-scale voltage V Z=Zero voltage D X=Data point being measured D MAX=Maximum data limit D MIN=Minimum data limit A good example of a ratiometric transducer is a potentiom- eter used as a position sensor. The position of the wiper is di- rectly proportional to the output voltage which is a ratio of the full-scale voltage across it. Since the data is represented as a proportion of full-scale, reference requirements are greatly reduced, eliminating a large source of error and cost for many applications. A major advantage of the ADC0808, ADC0809 is that the input voltage range is equal to the sup- ply range so the transducers can be connected directly across the supply and their outputs connected directly into the multiplexer inputs, ( Figure 9). Ratiometric transducers such as potentiometers, strain gauges, thermistor bridges, pressure transducers, etc., are suitable for measuring proportional relationships; however, many types of measurements must be referred to an abso- lute standard such as voltage or current. This means a sys- DS005672-16 FIGURE 6. Comparator I IN vs VIN (V CC=VREF=5V) DS005672-17 FIGURE 7. Multiplexer R ON vs VIN (V CC=VREF=5V) t 1H,tH1 DS005672-18 t 1H,CL = 10 pF DS005672-19 t H1,CL = 50 pF DS005672-20 t 0H,tH0 DS005672-21 t 0H,CL = 10 pF DS005672-22 t H0,CL = 50 pF DS005672-23 FIGURE 8. www.national.com 8 |
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