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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD7294 датащи(PDF) 20 Page - Analog Devices |
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AD7294 датащи(HTML) 20 Page - Analog Devices |
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20 / 45 page  AD7294 Preliminary Technical Data Rev. PrB | Page 20 of 45 is preferred. In addition, choosing a reference with an output trim adjustment, such as the on-chip internal reference or the AD431, allows a system designer to trim system errors by setting a reference voltage to a voltage other than the nominal. Long-term drift is a measure of how much the reference drifts over time. A reference with a tight long-term drift specification ensures that the overall solution remains stable during its entire lifetime. If choosing an external reference, consider a tight tem- perature coefficient specification to reduce the temperature dependence of the system output voltage on ambient conditions. ANALOG COMPARATOR LOOP The AD7294 consists of two set-point comparators that are used for independent analog control. The advantage of using analog control for current sensing is the dynamic speed of the analog loop vs. the speed of the digital loop, in that the analog control loop does not have the digital delays inherent in ADC- to-DAC signal processing. The ISENSEOVERRANGE pins signal whether the instrumentation amplifiers voltage from the current sense is greater then or less then the set point 240 mV. The 240 mV is the fixed threshold voltage of the over-range comparator and the current sense amplifier will saturate above this. |
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