AMC131M02DFMR datasheet(78/89 Pages) TI

78 / 89 page

To measure this shunt voltage, configure channel 0 of the AMC131M02 for gain = 32, which allows differential

voltage measurements of VIN1 = VAIN1P – VAIN1N = ±VREF / 8 = ±1.2 V / 32 = ±37.5 mV. The integrated charge

pump in the device allows voltage measurements 1.3 V below HGND while using a unipolar analog power

supply. This bipolar voltage measurement capability is important because one side of the shunt is connected to

the same ISO_GND potential as the HGND pin of the AMC131M02, which means that the absolute voltage that

the device must measure during the current measurement is up to 37.5 mV below HGND.

9.2.3 Application Curves

Electromagnetic interference (EMI) testing is common in many applications using the AMC131M02 to verify the

system does not produce radiated emissions that exceed the defined levels that can possibly negatively impact

other components or circuits in the system. See the Understanding electromagnetic compliance tests in digital

isolators white paper for a more in-depth description of EMI. The magnitude of acceptable radiation and testing

procedure for radiated emissions is put in place by the Comité International Spécial des Perturbations Radio,

also known as CISPR. Industrial applications measure according to the CISPR 11 standard, and automotive

applications measure to the CISPR 25 standard. For more information on the CISPR standards and the

respective magnitudes over frequency, see the An overview of radiated EMI specifications for power supplies

white paper.

Figure 9-6 and Figure 9-7 show the radiated emissions measurement for the AMC131M02 using the evaluation

module available at AMC131M03EVM.

The measurements were done following CISPR 11 requirements, that is in a in a semi-anechoic chamber using

a broadband antenna configured for horizontal and vertical polarizations with a 3-meter distance. The ADC is

receiving a continuous clock at the CLKIN pin, and is generating conversion results, however there is no SPI

communication while the emission profile is characterized.

Frequency (MHz)

40 50 6070

100

200

300 400500 700 1000

-10

RE Horizontal

CISPR11A

CISPR11B

Figure 9-6. AMC131M02 Horizontal Radiated

Emission CISPR11 Measurement

Frequency (MHz)

40 50 6070

100

200

300 400500 700 1000

-10

RE Vertical

CISPR11A

CISPR11B

Figure 9-7. AMC131M02 Vertical Radiated Emission

CISPR11 Measurement

AMC131M02

SBASA56 – SEPTEMBER 2023

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