Normalized Frequency (1/fS)

0

0.4

0.8

1.2

1.6

2

2.4

2.8

3.2

3.6

4

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

D001

Normalized Frequency (1/fS)

0

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

0.1

0.2

0.3

0.4

0.5

D001

Normalized Frequency (1/fS)

0

0.4

0.8

1.2

1.6

2

2.4

2.8

3.2

3.6

4

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

D001

Normalized Frequency (1/fS)

0

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

0.1

0.2

0.3

0.4

0.5

D001

20

PCM1840

SBAS989 – APRIL 2019

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Copyright © 2019, Texas Instruments Incorporated

7.3.7.2.1.4

Sampling Rate: 32 kHz or 29.4 kHz

Figure 30 and Figure 31 respectively show the magnitude response and the pass-band ripple for a decimation

filter with a sampling rate of 32 kHz or 29.4 kHz. Table 11 lists the specifications for a decimation filter with an

32-kHz or 29.4-kHz sampling rate.

Figure 30. Linear Phase Decimation Filter Magnitude

Response

Figure 31. Linear Phase Decimation Filter Pass-Band

Ripple

Table 11. 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

dB

Stop-band attenuation

Frequency range is 0.58 × fS to 4 × fS

73.7

dB

Frequency range is 4 × fS onwards

107.2

Group delay or latency

Frequency range is 0 to 0.454 × fS

16.9

1/fS

7.3.7.2.1.5

Sampling Rate: 48 kHz or 44.1 kHz

Figure 32 and Figure 33 respectively show the magnitude response and the pass-band ripple for a decimation

filter with a sampling rate of 48 kHz or 44.1 kHz. Table 12 lists the specifications for a decimation filter with an

48-kHz or 44.1-kHz sampling rate.

Figure 32. Linear Phase Decimation Filter Magnitude

Response

Figure 33. Linear Phase Decimation Filter Pass-Band

Ripple

Table 12. 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

dB

Stop-band attenuation

Frequency range is 0.58 × fS to 4 × fS

73.8

dB

Frequency range is 4 × fS onwards

98.1

Group delay or latency

Frequency range is 0 to 0.454 × fS

17.1

1/fS