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PCM1840 데이터시트(PDF) 19 Page - Texas Instruments |
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PCM1840 데이터시트(HTML) 19 Page - Texas Instruments |
19 / 34 page 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 19 PCM1840 www.ti.com SBAS989 – APRIL 2019 Product Folder Links: PCM1840 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated 7.3.7.2.1.2 Sampling Rate: 16 kHz or 14.7 kHz Figure 26 and Figure 27 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 9 lists the specifications for a decimation filter with an 16- kHz or 14.7-kHz sampling rate. Figure 26. Linear Phase Decimation Filter Magnitude Response Figure 27. Linear Phase Decimation Filter Pass-Band Ripple Table 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 dB Stop-band attenuation Frequency range is 0.58 × fS to 4 × fS 73.3 dB Frequency range is 4 × fS onwards 95.0 Group delay or latency Frequency range is 0 to 0.454 × fS 15.7 1/fS 7.3.7.2.1.3 Sampling Rate: 24 kHz or 22.05 kHz Figure 28 and Figure 29 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 10 lists the specifications for a decimation filter with an 24-kHz or 22.05-kHz sampling rate. Figure 28. Linear Phase Decimation Filter Magnitude Response Figure 29. Linear Phase Decimation Filter Pass-Band Ripple Table 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 dB Stop-band attenuation Frequency range is 0.58 × fS to 4 × fS 73.0 dB 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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