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PCM1796DB.B Datasheet(PDF) 40 Page - Texas Instruments |
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PCM1796DB.B Datasheet(HTML) 40 Page - Texas Instruments |
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40 / 63 page ![]() PCM1796 SLES100A − DECEMBER 2003 − REVISED NOVEMBER 2006 www.ti.com 40 FUNCTIONS AVAILABLE IN THE EXTERNAL DIGITAL FILTER MODE The external digital filter mode is selected by setting DSD = 0 (register 20, B5) and DFTH = 1 (register 20. B4). The external digital filter mode allows access to the majority of the PCM1796 mode control functions. The following table shows the register mapping available when the external digital filter mode is selected, along with descriptions of functions which are modified when using this mode selection. B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 Register 16 R/W 0 0 1 0 0 0 0 – – – – – – – – Register 17 R/W 0 0 1 0 0 0 1 – – – – – – – – Register 18 R/W 0 0 1 0 0 1 0 – FMT2 FMT1 FMT0 – – – – Register 19 R/W 0 0 1 0 0 1 1 REV – – OPE – DFMS – INZD Register 20 R/W 0 0 1 0 1 0 0 – SRST 0 1 MONO CHSL OS1 OS0 Register 21 R/W 0 0 1 0 1 0 1 – – – – – – – PCMZ Register 22 R 0 0 1 0 1 1 0 – – – – – – ZFGR ZFGL NOTE: –: Function is disabled. No operation even if data bit is set FMT[2:0]: Audio Data Format Selection Default value: 000 FMT[2:0] Audio Data Format Select 000 16-bit right-justified format (default) 001 20-bit right-justified format 010 24-bit right-justified format Other N/A OS[1:0]: Delta-Sigma Modulator Oversampling Rate Selection Default value: 00 OS[1:0] Operation Speed Select 00 8 times WDCK (default) 01 4 times WDCK 10 16 times WDCK 11 Reserved The effective oversampling rate is determined by the oversampling performed by both the external digital filter and the delta-sigma modulator. For example, if the external digital filter is 8 × oversampling, and the user selects OS[1:0] = 00, then the delta-sigma modulator oversamples by 8 ×, resulting in an effective oversampling rate of 64×. The 16 × WDCK oversampling rate is not available above a 100-kHz sampling rate. If the oversampling rate selected is 16 × WDCK, the system clock frequency must be over 256 fS. |
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