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WM8998 Datasheet(PDF) 46 Page - Wolfson Microelectronics plc |
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WM8998 Datasheet(HTML) 46 Page - Wolfson Microelectronics plc |
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46 / 307 page ![]() WM8998 Production Data w PD, October 2014, Rev 4.0 46 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R780 (030Ch) HPF Control 2:0 IN_HPF_CUT [2:0] 010 Input Path HPF Select Controls the cut-off frequency of the input path HPF circuits. 000 = 2.5Hz 001 = 5Hz 010 = 10Hz 011 = 20Hz 100 = 40Hz All other codes are Reserved R784 (0310h) IN1L Control 15 IN1L_HPF 0 Input Path 1 (Left) HPF Enable 0 = Disabled 1 = Enabled 14:13 IN1_OSR [1:0] 01 Input Path 1 DMIC Oversample Rate When analogue input is selected (IN1_MODE=0), this bit controls the performance mode 00 = Low Power mode 01 = High Performance mode 1X = Reserved When digital microphone input is selected (IN1_MODE=1), this field controls the sample rate as below: 00 = 1.536MHz 01 = 3.072MHz 10 = Reserved 11 = 768kHz When IN1_OSR=11, the Input Path sample rate (for all input paths) must be in the range 8kHz to 16kHz. 12:11 IN1_DMIC_SUP [1:0] 00 Input Path 1 DMIC Reference Select (Sets the DMICDAT1 and DMICCLK1 logic levels) 00 = MICVDD 01 = MICBIAS1 10 = MICBIAS2 11 = MICBIAS3 10 IN1_MODE 0 Input Path 1 Mode 0 = Analogue input 1 = Digital input 7:1 IN1L_PGA_VOL [6:0] 40h Input Path 1 (Left) PGA Volume (Applicable to analogue inputs only) 00h to 3Fh = Reserved 40h = 0dB 41h = 1dB 42h = 2dB … (1dB steps) 5F = 31dB 60h to 7Fh = Reserved R785 (0311h) ADC Digital Volume 1L 14:13 IN1L_SRC [1:0] 00 Input Path 1 (Left) Source 00 = Differential (IN1ALP - IN1ALN) 01 = Single-ended (IN1ALP) 10 = Differential (IN1BLP-IN1BLN) 11 = Single-ended (IN1BLP) R786 (0312h) DMIC1L Control 5:0 IN1L_DMIC_DLY [5:0] 00h Input Path 1 (Left) Digital Delay (Applicable to digital input only) LSB = 1 sample, Range is 0 to 63. (Sample rate is controlled by IN1_OSR.) |
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