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PCM1840 Scheda tecnica(PDF) 22 Page - Texas Instruments |
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PCM1840 Scheda tecnica(HTML) 22 Page - Texas Instruments |
22 / 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 22 PCM1840 SBAS989 – APRIL 2019 www.ti.com Product Folder Links: PCM1840 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated 7.3.7.2.2 Low-Latency Filters For applications where low latency with minimal phase deviation (within the audio band) is critical, the low- latency decimation filters on the PCM1840 can be used. The device supports these filters with a group delay of approximately seven samples with an almost linear phase response within the 0.365 × fS frequency band. This section provides the filter performance specifications and various plots for all supported output sampling rates for the low-latency filters. 7.3.7.2.2.1 Sampling Rate: 16 kHz or 14.7 kHz Figure 38 shows the magnitude response and Figure 39 shows the pass-band ripple and phase deviation for a decimation filter with a sampling rate of 16 kHz or 14.7 kHz. Table 15 lists the specifications for a decimation filter with a 16-kHz or 14.7-kHz sampling rate. Figure 38. Low-Latency Decimation Filter Magnitude Response Figure 39. Low-Latency Decimation Filter Pass-Band Ripple and Phase Deviation Table 15. Low-Latency Decimation Filter Specifications PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Pass-band ripple Frequency range is 0 to 0.451 × fS –0.05 0.05 dB Stop-band attenuation Frequency range is 0.61 × fS onwards 87.3 dB Group delay or latency Frequency range is 0 to 0.363 × fS 7.6 1/fS Group delay deviation Frequency range is 0 to 0.363 × fS –0.022 0.022 1/fS Phase deviation Frequency range is 0 to 0.363 × fS –0.21 0.25 Degrees |
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