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PCM1840 Scheda tecnica(PDF) 23 Page - Texas Instruments |
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PCM1840 Scheda tecnica(HTML) 23 Page - Texas Instruments |
23 / 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 D002 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 -0.5 -0.4 -0.4 -0.3 -0.3 -0.2 -0.2 -0.1 -0.1 0 0 0.1 0.1 0.2 0.2 0.3 0.3 0.4 0.4 0.5 0.5 D002 Pass-Band Ripple Phase Deviation 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 D002 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 -0.5 -0.4 -0.4 -0.3 -0.3 -0.2 -0.2 -0.1 -0.1 0 0 0.1 0.1 0.2 0.2 0.3 0.3 0.4 0.4 0.5 0.5 D002 Pass-Band Ripple Phase Deviation 23 PCM1840 www.ti.com SBAS989 – APRIL 2019 Product Folder Links: PCM1840 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated 7.3.7.2.2.2 Sampling Rate: 24 kHz or 22.05 kHz Figure 40 shows the magnitude response and Figure 41 shows the pass-band ripple and phase deviation for a decimation filter with a sampling rate of 24 kHz or 22.05 kHz. Table 16 lists the specifications for a decimation filter with a 24-kHz or 22.05-kHz sampling rate. Figure 40. Low-Latency Decimation Filter Magnitude Response Figure 41. Low-Latency Decimation Filter Pass-Band Ripple and Phase Deviation Table 16. 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 dB Stop-band attenuation Frequency range is 0.6 × fS onwards 87.2 dB 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 7.3.7.2.2.3 Sampling Rate: 32 kHz or 29.4 kHz Figure 42 shows the magnitude response and Figure 43 shows the pass-band ripple and phase deviation for a decimation filter with a sampling rate of 32 kHz or 29.4 kHz. Table 17 lists the specifications for a decimation filter with a 32-kHz or 29.4-kHz sampling rate. Figure 42. Low-Latency Decimation Filter Magnitude Response Figure 43. Low-Latency Decimation Filter Pass-Band Ripple and Phase Deviation |
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