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ADC9708CMJ Arkusz danych(PDF) 6 Page - National Semiconductor (TI) |
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ADC9708CMJ Arkusz danych(HTML) 6 Page - National Semiconductor (TI) |
6 / 8 page Typical Applications (Continued) 3 The auto-zeroauto-full-scale (See Figures 5 – 8 ) should use double precision rounded (as opposed to truncated) arithmatic Several points are worth noting a The subtractions are single op code instructions b The full scale correction uses a multiply by 256 and can be accomplished by a shift left 8 bits (usually one instruction) or placing (N b NZ) in the MSB register and setting the LSB register to zero for the double precision divide c The divisor (NFS b NZ) of the MSB register will al- ways be zero These schemes have the following advantages a No access to the data bus or address bus is required by the AD system b 5 IO bits completely support the AD system c Since auto full scaleauto zero are implemented in software and long term drift (aging) effects are elimi- nated d Software overhead is minimal (typically 30 bytes) e Where ratiometric operation is permissible the 4 exter- nal components may be g5% tolerance including the power supply TLH10409 – 11 Note D VI e (Applied Force) and can be Linearized (if necessary) in Software FIGURE 9 Ratiometric Strain Gage SensoreController TLH10409 – 12 Applications Beverage BrewersDispensers Ramp Current e IR e VCC a R1 R1 a R2 J 1R 3 J Chemical Solution Control Automatic Liquid Mixing Control VI e RX RX a RB J VCCa Ramp Time e VI CHI R J e RX RX a RB J1aR2R 1 JCHR3J FIGURE 10 6 |
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Podobny opis - ADC9708CMJ |
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