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WM8946ECS/R Datasheet(PDF) 34 Page - Wolfson Microelectronics plc |
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WM8946ECS/R Datasheet(HTML) 34 Page - Wolfson Microelectronics plc |
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34 / 175 page  WM8946 Production Data w PD, July 2012, Rev 4.3 34 Record mode enables the entire set of Signal Enhancement functions in the ADC path. The direct DAC path is also active, without any Signal Enhancement functions; this allows basic audio playback and digital beep generation. Playback mode enables the entire set of DSP functions in the DAC path. The direct ADC path is also active, without any DSP functions; this allows basic audio record functions to the host system. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R64 (40h) SE Config Selection 3:0 SE_CONFIG [3:0] 0000 DSP Configuration Mode select 0000 = Record mode 0001 = Playback mode 0010 = Reserved 0011 = Reserved Table 12 DSP Configuration Mode Select LOW-PASS / HIGH-PASS FILTER (LPF/HPF) The Low-pass / High-pass filter is part of the SE1 block. This first-order filter can be configured to be high-pass, low-pass; it can also be bypassed. The cut-off frequency is programmable; the default setting is bypass (OFF). The left and right channel parameters may be programmed individually. The left and right filters are enabled using the SE1_LHPF_L_ENA and SE1_LHPF_R_ENA register bits defined in Table 13. For the derivation of the other associated registers, refer to the configuration tools supplied with the WM8946 Evaluation Kit. Example plots of the Low-pass / High-pass filter response are shown in Figure 14. 1kLPF.res Magnitude(dB) 1kHPF.res Magnitude(dB) 5kLPF.res Magnitude(dB) 5kHPF.res Magnitude(dB) 200LPF.res Magnitude(dB) 200HPF.res Magnitude(dB) 20 39.91 79.62 158.9 317 632.5 1.262k 2.518k 5.024k 10.02k 20k -27 -24 -21 -18 -15 -12 -9 -6 -3 0 3 Figure 14 Low-pass / High-pass Filter Responses |
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