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STA32613TR bảng dữ liệu(PDF) 11 Page - STMicroelectronics |
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STA32613TR bảng dữ liệu(HTML) 11 Page - STMicroelectronics |
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11 / 43 page  11/43 STA326 7.1 CONFIGURATION REGISTER A (Address 00h) 7.1.1 Master Clock Select The STA326 will support sample rates of 32kHz, 44.1kHz, 48Khz, 88.2kHz, and 96kHz. Therefore the internal clock will be: ■ 32.768Mhz for 32kHz ■ 45.1584Mhz for 44.1khz, 88.2kHz, and 176.4kHz ■ 49.152Mhz for 48kHz, 96kHz, and 192kHz The external clock frequency provided to the XTI pin must be a multiple of the input sample frequency (fs). The correlation between the input clock and the input sample rate is determined by the status of the MCSx bits 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. Table 7. IR and MCS Settings for Input Sample Rate and Clock Rate 7.1.2 Interpolation Ratio Select The STA326 has variable interpolation (re-sampling) settings such that internal processing and DDX out- put rates remain consistent. The first processing block interpolates by either 2 times or 1 time (pass- through) or provides a down-sample by a factor of 2. The IR bits determine the re-sampling ratio of this interpolation. Table 8. IR bit settings as a function of Input Sample Rate D7 D6 D5 D4 D3 D2 D1 D0 FDRB TWAB TFRB IR1 IR0 MCS2 MCS1 MCS0 01100011 BIT R/W RST NAME DESCRIPTION 0 R/W 1 MCS0 Master Clock Select: Selects the ratio between the input I2S sample frequency and the input clock. 1R/W 1 MCS1 2R/W 0 MCS2 Input Sample Rate fs (kHz) IR MCS(2..0) 000 001 010 011 100 101 32, 44.1, 48 00 768fs 512fs 384fs 256fs 128fs 576fs 88.2, 96 01 384fs 256fs 192fs 128fs 64fs x 176.4, 192 1X 384fs 256fs 192fs 128fs 64fs x BIT R/W RST NAME DESCRIPTION 4...3 R/W 00 IR (1...0) Interpolation Ratio Select: Selects internal interpolation ratio based on input I2S sample frequency Input Sample Rate Fs (kHz) IR (1,0) 1st Stage Interpolation Ratio 32 00 2 times over-sampling 44.1 00 2 times over-sampling 48 00 2 times over-sampling 88.2 01 Pass-Through 96 01 Pass-Through 176.4 10 Down-sampling by 2 192 10 Down-sampling by 2 |
Số phần tương tự - STA32613TR |
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Mô tả tương tự - STA32613TR |
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