PCMD3140IRTER datasheet(43/106 Pages) TI

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7.3.6.7.3.2 Sampling Rate: 22.05 kHz to 24 kHz

Figure 7-51 shows the magnitude response and Figure 7-52 shows the pass-band ripple and phase deviation

for a decimation filter with a sampling rate of 22.05 kHz to 24 kHz. Table 7-35 lists the specifications for a

decimation filter with a 22.05-kHz to 24-kHz sampling rate.

Normalized Frequency (1/fS)

0.4

0.8

1.2

1.6

2.4

2.8

3.2

3.6

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

D003

Figure 7-51. Ultra-Low-Latency Decimation Filter

Magnitude Response

Normalized Frequency (1/fS)

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

-0.5

-25

-0.4

-20

-0.3

-15

-0.2

-10

-0.1

-5

0.1

0.2

0.3

0.4

0.5

D003

Pass-Band Ripple

Phase Deviation

Figure 7-52. Ultra-Low-Latency Decimation Filter

Pass-Band Ripple and Phase Deviation

Table 7-35. Ultra-Low-Latency Decimation Filter Specifications

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Pass-band ripple

Frequency range is 0 to 0.46 × fS

–0.01

0.01

Stop-band attenuation

Frequency range is 0.6 × fS onwards

87.1

Group delay or latency

Frequency range is 0 to 0.325 × fS

4.1

1/fS

Group delay deviation

Frequency range is 0 to 0.325 × fS

–0.514

0.514

1/fS

Phase deviation

Frequency range is 0 to 0.325 × fS

–10.0

14.3

Degrees

7.3.6.7.3.3 Sampling Rate: 29.4 kHz to 32 kHz

Figure 7-53 shows the magnitude response and Figure 7-54 shows the pass-band ripple and phase deviation for

a decimation filter with a sampling rate of 29.4 kHz to 32 kHz. Table 7-36 lists the specifications for a decimation

filter with a 29.4-kHz to 32-kHz sampling rate.

Normalized Frequency (1/fS)

0.4

0.8

1.2

1.6

2.4

2.8

3.2

3.6

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

D003

Figure 7-53. Ultra-Low-Latency Decimation Filter

Magnitude Response

Normalized Frequency (1/fS)

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

-0.5

-25

-0.4

-20

-0.3

-15

-0.2

-10

-0.1

-5

0.1

0.2

0.3

0.4

0.5

D003

Pass-Band Ripple

Phase Deviation

Figure 7-54. Ultra-Low-Latency Decimation Filter

Pass-Band Ripple and Phase Deviation

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PCMD3140

SBASA64A – DECEMBER 2020 – REVISED JUNE 2021

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