MAX17823B datasheet(58/121 Pages) MAXIM

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MAX17823B

12-Channel High-Voltage Data Acquisition System

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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 +

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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