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AMC131M02DFMR Datasheet(PDF) 72 Page - Texas Instruments |
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AMC131M02DFMR Datasheet(HTML) 72 Page - Texas Instruments |
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72 / 89 page  CLKOUT IRQ SCLK PICO CS1 MCU GPIO CS2 POCI CSn SYNC/RESET CLKIN DRDY SCLK DIN DOUT Device 1 CS SYNC/RESET CLKIN DRDY SCLK DIN DOUT Device 2 CS SYNC/RESET CLKIN DRDY SCLK DIN DOUT Device n CS Figure 9-3. Multiple Device Configuration 9.1.5 Calibration Certain signal chain errors can be corrected through a single room-temperature calibration. The AMC131M02 can store calibration values and uses the values to correct the results in real time. Among the errors that can be corrected in real time with the AMC131M02 are offset error, gain error, and phase error. Offset calibration is performed by determining the measured output of the signal chain when the input is zero voltage for a voltage channel or zero current for a current channel. The ADC conversion result for zero input can be measured and recorded in external nonvolatile memory for each channel. When the system is deployed, these values can be provided to the CHn_OCAL_MSB and CHn_OCAL_LSB registers for the corresponding channels. The AMC131M02 then subtracts these values from the conversion results prior to providing them to the host. Similar to offset error correction, system gain error can be determined prior to deployment and can be used to correct the gain error on each channel in real time. Gain error is defined as the percentage difference in the ADC transfer function from the PGA gain corrected ideal value of 1. This error can be determined by measuring the results from both a maximum and minimum input signal, finding the difference between these results, and dividing by the difference between the ideal difference. Equation 11 describes how to calculate gain error. Max,Measured Min,Measured Max Min V,I V,I Gain Error 1 V,I V,I (11) AMC131M02 SBASA56 – SEPTEMBER 2023 www.ti.com 72 Submit Document Feedback Copyright © 2023 Texas Instruments Incorporated Product Folder Links: AMC131M02 |
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