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WM8994ECS/R Datasheet(PDF) 44 Page - Cirrus Logic |
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WM8994ECS/R Datasheet(HTML) 44 Page - Cirrus Logic |
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44 / 363 page  WM8994 44 Rev 4.6 ANALOGUE INPUT SIGNAL PATH The WM8994 has eight highly flexible analogue input channels, configurable in a large number of combinations: 1. Up to four fully differential or single-ended microphone inputs 2. Up to eight mono line inputs or 4 stereo line inputs 3. A dedicated mono differential input from external voice CODEC These inputs may be mixed together or independently routed to different combinations of output drivers. An internal record path is provided at the input mixers to allow DAC output to be mixed with the input signal path (e.g. for voice call recording). The WM8994 input signal paths and control registers are illustrated in Figure 12. IN1LP IN1LN IN1RN IN2LN/DMICDAT1 IN2RN/DMICDAT2 IN1RP IN2LP/VRXN IN2RP/VRXP MIXINR IN1L IN2L IN2R IN1R RXVOICE MIXINL REC L REC R + + IN2L_ENA MIXINL_ENA IN1L_MUTE / IN1L_VOL[4:0] IN1LP_TO_IN1L IN2LRP_MIXINL_VOL[2:0] IN2R_TO_MIXINR / IN2R_MIXINR_VOL IN2L_TO_MIXINL / IN2L_MIXINL_VOL IN1L_TO_MIXINL / IN1L_MIXINL_VOL MIXOUTL_MIXINL_VOL[2:0] IN1LP_MIXINL_VOL[2:0] MIXINR_ENA IN2LRP_MIXINR_VOL[2:0] IN1RP_MIXINR_VOL[2:0] MIXOUTR_MIXINR_VOL[2:0] IN1R_TO_MIXINR / IN1R_MIXINR_VOL IN1L_ENA IN2R_ENA IN1R_ENA IN2L_MUTE / IN2L_VOL[4:0] IN1R_MUTE / IN1R_VOL[4:0] IN2R_MUTE / IN2R_VOL[4:0] IN1RN_TO_IN1R IN1RP_TO_IN1R IN2RN_TO_IN2R IN2RP_TO_IN2R IN2LN_TO_IN2L IN2LP_TO_IN2L IN1LN_TO_IN1L IN1R IN1L MIXINR MIXINL IN1LP IN1LN IN1RN IN2LN IN2RN IN1RP IN2LP/VRXN IN2RP/VRXP ADC R ADC L VMID_BUF_ENA VMID Buffered VMID reference Figure 12 Control Registers for Input Signal Path |
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