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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MAX17823B датащи(PDF) 58 Page - Maxim Integrated Products |
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MAX17823B датащи(HTML) 58 Page - Maxim Integrated Products |
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58 / 121 page  ________________________________________________________________________________________________________________________________________________________________ MAX17823B 12-Channel High-Voltage Data Acquisition System www.maximintegrated.com Maxim Integrated | 58 LSAMP Offset Diagnostic Measurement The LSAMP diagnostic measurement (DIAGSEL[2:0] = 0b011) measures the level-shift amplifier offset by shorting the LSAMP inputs during the diagnostic portion of the acquisition. The result is available in the DIAG register after a normal acquisition. For this measurement, the ADC polarity is automatically set to bipolar mode to allow accurate measurement of voltages near zero. This measurement eliminates the chopping phase to preserve the offset error. If the diagnostic measurement exceeds the valid range for VOS_LSAMP as specified in the Electrical Characteristics table, the chopping function may not be able to cancel out all of the offset error and acquisition accuracy could be degraded accordingly. + - LSAMP HVMUX bus ADC IN - ADC IN + LV MUX ADC ADC automatically in bipolar mode G=6/13 Figure 34. LSAMP Offset Diagnostic The LSAMP offset is computed from the result in the DIAG register as follows: LSAMP Offset = ( | DIAG[15:2] - 2000h | / 16384d ) x 5V The validity of measurements through LSAMP is further confirmed by the ALTREF and VAA diagnostics, and comparison of the VBLKP measurement to the sum of the cell measurements. |
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