AMC131M02 datasheet(72/89 Pages) TI

72 / 89 page

CLKOUT

IRQ

SCLK

PICO

CS1

MCU

GPIO

CS2

POCI

CSn

SYNC/RESET

CLKIN

DRDY

SCLK

DIN

DOUT

Device 1

SYNC/RESET

CLKIN

DRDY

SCLK

DIN

DOUT

Device 2

SYNC/RESET

CLKIN

DRDY

SCLK

DIN

DOUT

Device n

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

Gain Error

V,I

(11)

AMC131M02

SBASA56 – SEPTEMBER 2023

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