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STA333BW датащи(PDF) 24 Page - STMicroelectronics |
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STA333BW датащи(HTML) 24 Page - STMicroelectronics |
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24 / 68 page ![]() Register description STA333BW 24/68 DocID13773 Rev 5 The relationship between the input clock and the input sample rate is determined by both the MCSx and the IR (input rate) register bits. The MCSx bits determine the PLL factor generating the internal clock and the IR bit determines the oversampling ratio used internally. Interpolation ratio select The STA333BW has variable interpolation (oversampling) settings such that internal processing and FFX output rates remain consistent. The first processing block interpolates by either 2-times or 1-time (pass-through) or provides a 2-times downsample. The oversampling ratio of this interpolation is determined by the IR bits. Table 11. Input sampling rates Input sample rate fs (kHz) IR MCS[2:0] 101 100 011 010 001 000 32, 44.1, 48 00 576 * fs 128 * fs 256 * fs 384 * fs 512 * fs 768 * fs 88.2, 96 01 NA 64 * fs 128 * fs 192 * fs 256 * fs 384 * fs 176.4, 192 1X NA 32 * fs 64 * fs 96 * fs 128 * fs 192 * fs Table 12. Internal interpolation ratio Bit R/W RST Name Description 4:3 R/W 00 IR [1:0] Selects internal interpolation ratio based on input I²S sample frequency Table 13. IR bit settings as a function of input sample rate Input sample rate fs (kHz) IR 1st stage interpolation ratio 32 00 2-times oversampling 44.1 00 2-times oversampling 48 00 2-times oversampling 88.2 01 Pass-through 96 01 Pass-through 176.4 10 2-times downsampling 192 10 2-times downsampling |
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