PCM1820 datasheet(21/40 Pages) TI

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8.3.6.2.1.2 Sampling Rate: 16 kHz or 14.7 kHz

Figure 8-11 and Figure 8-12 respectively show the magnitude response and the pass-band ripple for a

decimation filter with a sampling rate of 16 kHz or 14.7 kHz. Table 8-9 lists the specifications for a decimation

filter with an 16-kHz or 14.7-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

D001

Figure 8-11. Linear Phase 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

D001

Figure 8-12. Linear Phase Decimation Filter Pass-

Band Ripple

Table 8-9. Linear Phase Decimation Filter Specifications

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Pass-band ripple

Frequency range is 0 to 0.454 × fS

–0.05

0.05

Stop-band attenuation

Frequency range is 0.58 × fS to 4 × fS

73.3

Frequency range is 4 × fS onwards

95.0

Group delay or latency

Frequency range is 0 to 0.454 × fS

15.7

1/fS

8.3.6.2.1.3 Sampling Rate: 24 kHz or 22.05 kHz

Figure 8-13 and Figure 8-14 respectively show the magnitude response and the pass-band ripple for a

decimation filter with a sampling rate of 24 kHz or 22.05 kHz. Table 8-10 lists the specifications for a decimation

filter with an 24-kHz or 22.05-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

D001

Figure 8-13. Linear Phase 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

D001

Figure 8-14. Linear Phase Decimation Filter Pass-

Band Ripple

Table 8-10. Linear Phase Decimation Filter Specifications

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Pass-band ripple

Frequency range is 0 to 0.454 × fS

–0.05

0.05

Stop-band attenuation

Frequency range is 0.58 × fS to 4 × fS

73.0

Frequency range is 4 × fS onwards

96.4

Group delay or latency

Frequency range is 0 to 0.454 × fS

16.6

1/fS

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PCM1820, PCM1821

SBASA61 – DECEMBER 2020

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