PCMD3140 datasheet(39/111 Pages) TI

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7.3.6.7.2.2 Sampling Rate: 22.05 kHz to 24 kHz

Figure 7-39 shows the magnitude response and Figure 7-40 shows the pass-band ripple and phase deviation

for a decimation filter with a sampling rate of 22.05 kHz to 24 kHz. Table 7-29 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

D002

Figure 7-39. 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

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

D002

Pass-Band Ripple

Phase Deviation

Figure 7-40. Low-Latency Decimation Filter Pass-

Band Ripple and Phase Deviation

Table 7-29. Low-Latency Decimation Filter Specifications

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Pass-band ripple

Frequency range is 0 to 0.459 × fS

–0.01

0.01

Stop-band attenuation

Frequency range is 0.6 × fS onwards

87.2

Group delay or latency

Frequency range is 0 to 0.365 × fS

7.5

1/fS

Group delay deviation

Frequency range is 0 to 0.365 × fS

–0.026

0.026

1/fS

Phase deviation

Frequency range is 0 to 0.365 × fS

–0.26

0.30

Degrees

7.3.6.7.2.3 Sampling Rate: 29.4 kHz to 32 kHz

Figure 7-41 shows the magnitude response and Figure 7-42 shows the pass-band ripple and phase deviation for

a decimation filter with a sampling rate of 29.4 kHz to 32 kHz. Table 7-30 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

D002

Figure 7-41. 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

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

D002

Pass-Band Ripple

Phase Deviation

Figure 7-42. Low-Latency Decimation Filter Pass-

Band Ripple and Phase Deviation

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PCMD3140-Q1

SBASAH3A – APRIL 2022 – REVISED SEPTEMBER 2022

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