AMC131M01DFMR datasheet(26/81 Pages) TI

26 / 81 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 Calibration Registers

The calibration registers allow for automatic computation of calibrated ADC conversion results from

preprogrammed values. The host can rely on the device to automatically correct for system gain and offset after

the error correction terms are programmed into the corresponding device registers. The measured calibration

coefficients must be stored in external nonvolatile memory and programmed into the registers each time the

AMC131M01 powers up because the AMC131M01 registers are volatile.

AMC131M01

SBASA57 – SEPTEMBER 2023

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