AMC131M03 datasheet(23/90 Pages) TI

23 / 90 page

Equation 7 calculates the transfer function of a sinc3 filter in terms of the continuous-time frequency parameter f.

½H(f) =

sin

N f

MOD

sin

MOD

(7)

where:

• N is the OSR

Figure 8-7 and Figure 8-8 show the digital filter response of the fast-settling filter and the sinc3 filter for OSRs of

1024 and lower. Figure 8-9 and Figure 8-10 show the digital filter response of the sinc3 + sinc1 filter for an OSR

of 4096.

Frequency (fIN/fDATA)

-140

-120

-100

-80

-60

-40

-20

Fast-settling filter

Sinc3 filter

Figure 8-7. Fast-Settling and Sinc3 Digital Filter

Response

Frequency (fIN/fDATA)

0.1

0.2

0.3

0.4

0.5

-12

-10.5

-9

-7.5

-6

-4.5

-3

-1.5

Fast-settling filter

Sinc3 filter

Figure 8-8. Fast-Settling and Sinc3 Digital Filter

Response, Pass-Band Detail

Frequency (fIN/fDATA)

-140

-120

-100

-80

-60

-40

-20

Sinc3 filter (1024)

Sinc3 + Sinc1 filter

Figure 8-9. Digital Filter Response for OSR = 4096

as a Combination of Sinc3 + Sinc1

Frequency (fIN/fDATA)

0.1

0.2

0.3

0.4

0.5

-12

-10

-8

-6

-4

-2

Sinc3 filter (1024)

Sinc3 + Sinc1 filter

Figure 8-10. Sinc3 + Sinc1 Digital Filter Response

at OSR = 4096, Pass-Band Detail

8.3.12 Channel Phase Calibration

The AMC131M03-Q1 allows fine adjustment of the sample phase between channels by using channel phase

calibration. This feature is helpful when different channels are measuring the outputs of different types of

sensors that have different phase responses. For example, in power metrology applications, voltage can be

measured by a voltage divider, whereas current is measured using a current transformer that exhibits a phase

difference between the input and output signals. The differences in phase between the voltage and current

measurement must be compensated to measure the power and related parameters accurately.

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AMC131M03-Q1

SBASAO3 – MAY 2023

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