PCM1820 datasheet(49/120 Pages) TI

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Table 8-43. Ultra-Low-Latency Decimation Filter Specifications

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Pass-band ripple

Frequency range is 0 to 0.463 × fS

–0.03

0.03

Stop-band attenuation

Frequency range is 0.6 × fS onwards

85.6

Group delay or latency

Frequency range is 0 to 0.085 × fS

3.7

1/fS

Group delay deviation

Frequency range is 0 to 0.085 × fS

–0.024

0.024

1/fS

Phase deviation

Frequency range is 0 to 0.085 × fS

–0.12

0.18

Degrees

8.3.6.7.3.7 Sampling Rate: 352.8 kHz to 384 kHz

Figure 8-61 shows the magnitude response and Figure 8-62 shows the pass-band ripple and phase deviation

for a decimation filter with a sampling rate of 352.8 kHz to 384 kHz. Table 8-44 lists the specifications for a

decimation filter with a 352.8-kHz to 384-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 8-61. Ultra-Low-Latency Decimation Filter

Magnitude Response

Normalized Frequency (1/fS)

0.05

0.1

0.15

0.2

0.25

-0.5

-2

-0.4

-1.6

-0.3

-1.2

-0.2

-0.8

-0.1

-0.4

0.1

0.4

0.2

0.8

0.3

1.2

0.4

1.6

0.5

D002

Pass-Band Ripple

Phase Deviation

Figure 8-62. Ultra-Low-Latency Decimation Filter

Pass-Band Ripple and Phase Deviation

Table 8-44. Ultra-Low-Latency Decimation Filter Specifications

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Pass-band ripple

Frequency range is 0 to 0.1 × fS

–0.04

0.01

Stop-band attenuation

Frequency range is 0.56 × fS onwards

70.1

Group delay or latency

Frequency range is 0 to 0.157 × fS

4.1

1/fS

Group delay deviation

Frequency range is 0 to 0.157 × fS

–0.18

0.18

1/fS

Phase deviation

Frequency range is 0 to 0.157 × fS

–0.85

2.07

Degrees

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TLV320ADC3120

SBASA91A – DECEMBER 2020 – REVISED JUNE 2021

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