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PCM1840 Arkusz danych(PDF) 18 Page - Texas Instruments |
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PCM1840 Arkusz danych(HTML) 18 Page - Texas Instruments |
18 / 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 18 PCM1840 SBAS989 – APRIL 2019 www.ti.com Product Folder Links: PCM1840 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated 7.3.7.2 Configurable Digital Decimation Filters The device record channel includes a high dynamic range, built-in digital decimation filter to process the oversampled data from the multibit delta-sigma (ΔΣ) modulator to generate digital data at the same Nyquist sampling rate as the FSYNC rate. The decimation filter can be chosen from two different types only in slave mode, depending on the required frequency response, group delay, and phase linearity requirements for the target application. The selection of the decimation filter option can be done by the MD0 pin. Table 7 shows the decimation filter mode selection for the record channel. Table 7. Decimation Filter Mode Selection for the Record Channel MD0 DECIMATION FILTER MODE SELECTION (Supported Only in Slave Mode) LOW Linear phase filters are used for the decimation in slave mode. For master mode, the device always use linear phase filters for the decimation. HIGH Low latency filters are used for the decimation in slave mode. For master mode, the device always use linear phase filters for the decimation. 7.3.7.2.1 Linear Phase Filters The linear phase decimation filters are the default filters set by the device and can be used for all applications that require a perfect linear phase with zero-phase deviation within the pass-band specification of the filter. The filter performance specifications and various plots for all supported output sampling rates are listed in this section. 7.3.7.2.1.1 Sampling Rate: 8 kHz or 7.35 kHz Figure 24 and Figure 25 respectively show the magnitude response and the pass-band ripple for a decimation filter with a sampling rate of 8 kHz or 7.35 kHz. Table 8 lists the specifications for a decimation filter with an 8-kHz or 7.35-kHz sampling rate. Figure 24. Linear Phase Decimation Filter Magnitude Response Figure 25. Linear Phase Decimation Filter Pass-Band Ripple Table 8. 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 72.7 dB Frequency range is 4 × fS onwards 81.2 Group delay or latency Frequency range is 0 to 0.454 × fS 17.1 1/fS |
Podobny numer części - PCM1840 |
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Podobny opis - PCM1840 |
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