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WM8962B Datasheet(PDF) 37 Page - Wolfson Microelectronics plc |
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WM8962B Datasheet(HTML) 37 Page - Wolfson Microelectronics plc |
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37 / 295 page  WM8962 Rev 4.3 37 INPUT SIGNAL PATH The WM8962 has many analogue input channels, configurable in combinations of up to eight mono inputs or four stereo inputs. Any of the analogue inputs may be connected to the input PGA on the associated left or right channel. (Note that only one analogue input can be connected to the PGA at any time; the PGA does not perform any signal mixing.) The left and right analogue inputs IN2 and IN3 can be connected to the input boost mixer on the associated left or right channel, bypassing the input PGA. Note that the input signal path audio performance is affected by the choice of signal path. Best performance is achieved using analogue inputs IN2 or IN3 connected directly to the input boost mixer. The performance of the input signal paths are ranked as described in the list below (best performance first). IN2 or IN3 connected directly to the input boost mixer IN1 or IN4 connected via the input PGA IN2 or IN3 connected via the input PGA The left and right analogue inputs IN4 can be connected directly to the output signal mixers, which drive the headphone or speaker outputs. The input signal paths and the control registers are shown in Figure 13. IN1R IN4R + + ADC DIGITAL FILTERS ALC Wind noise Filter Volume INPGAL_ENA or INL_ENA INPGAR_ENA or INR_ENA PGAL PGAR IN1R_TO_INPGAR IN4R_TO_INPGAR INL_VOL IN_VU INL_ZC INPGAL_MUTE INR_VOL IN_VU INR_ZC INPGAR_MUTE MIXINL MIXINL_ENA or INL_ENA MIXINR_ENA or INR_ENA MIXINR_MUTE ADC ADC WM8962 INPGAL_TO_MIXINL / INPGAL_MIXINL_VOL INPGAR_TO_MIXINR / INPGAR_MIXINR_VOL VMID VMID IN2R IN3R IN2R_TO_INPGAR IN3R_TO_INPGAR IN1L IN4L IN1L_TO_INPGAL IN4L_TO_INPGAL IN2L IN3L IN2L_TO_INPGAL IN3L_TO_INPGAL IN3R_TO_MIXINR / IN3R_MIXINR_VOL IN2R_TO_MIXINR / IN2R_MIXINR_VOL To Left and Right Speaker and Headphone Mixers To Left and Right Speaker and Headphone Mixers IN2L_TO_MIXINL / IN2L_MIXINL_VOL IN3L_TO_MIXINL / IN3L_MIXINL_VOL MIXINL_MUTE MIXINR + + Figure 13 Analogue Input Signal Path |
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