поискавой системы для электроныых деталей |
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AD2S90 датащи(PDF) 10 Page - Analog Devices |
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AD2S90 датащи(HTML) 10 Page - Analog Devices |
10 / 12 page AD2S90 REV. D –10– The small step response is given in Figure 20, and is the time taken for the converter to settle to within 1 LSB. ts = 7.00 ms (maximum) The large step response (steps >20 °) applies when the error voltage will exceed the linear range of the converter. Typically it will take three times longer to reach the first peak for a 179 ° step. In response to a velocity step [VELOUT/(d θ/dt)] the velocity output will exhibit the same response characteristics as outlined above. 0 10 20 016 4 812 Figure 20. Small Step Response SOURCES OF ERROR Acceleration Error A tracking converter employing a Type 2 servo loop does not suffer any velocity lag, however, there is an additional error due to acceleration. This additional error can be defined using the acceleration constant Ka of the converter. K a = Input Acceleration Error in Output Angle (10) The numerator and denominator’s units must be consistent. Ka does not define maximum input acceleration, only the error due to its acceleration. The maximum acceleration allowable before the converter loses track is dependent on the angular accuracy requirements of the system. Angular Error × K a = degrees/sec 2 (11) Ka can be used to predict the output position error for a given input acceleration. The AD2S90 has a fixed Ka = 3.0 × 10 6 sec –2 if we apply an input accelerating at 100 revs/sec2, the error can be calculated as follows: Error in LSBs = Input Acceleration LSB / sec 2 [] Ka sec − 2 [] = []× [] × [] = 100 2 30 10 014 12 62 rev LSB rev LSBs // . sec . – sec2 (12) |
Аналогичный номер детали - AD2S90 |
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Аналогичное описание - AD2S90 |
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