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WM8976GEFL/V Datasheet(PDF) 54 Page - Wolfson Microelectronics plc |
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WM8976GEFL/V Datasheet(HTML) 54 Page - Wolfson Microelectronics plc |
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54 / 108 page  WM8976 Pre-Production w PP Rev 3.0 April 2006 54 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 7 LOUT2ZC 0 Speaker volume zero cross enable: 1 = Change gain on zero cross only 0 = Change gain immediately 6 LOUT2MUTE 0 Left speaker output mute: 0 = Normal operation 1 = Mute 5:0 LOUT2VOL 111001 Left speaker output volume: 000000 = -57dB ... 111001 = 0dB ... 111111 = +6dB R54 LOUT2 (SPK) Volume control 8 SPKVU Not latched LOUT2 and ROUT2 volumes do not update until a 1 is written to SPKVU (in reg 54 or 55) 7 ROUT2ZC 0 Speaker volume zero cross enable: 1 = Change gain on zero cross only 0 = Change gain immediately 6 ROUT2MUTE 0 Right speaker output mute: 0 = Normal operation 1 = Mute 5:0 ROUT2VOL 111001 Right speaker output volume: 000000 = -57dB ... 111001 = 0dB ... 111111 = +6dB R55 ROUT2 (SPK) Volume control 8 SPKVU Not latched LOUT2 and ROUT2 volumes do not update until a 1 is written to SPKVU (in reg 54 or 55) Table 40 Speaker Volume Control The signal output on LOUT2/ROUT2 comes from the Left/Right Mixer circuits and can be any combination of the DAC output, the Bypass path (output of the input boost stage) and the AUX input. The LOUT2/ROUT2 volume is controlled by the LOUT2VOL/ ROUT2VOL register bits. Gains over 0dB may cause clipping if the signal is large. The LOUT2MUTE/ ROUT2MUTE register bits cause the speaker outputs to be muted (the output DC level is driven out). The output pins remain at the same DC level (DCOP), so that no click noise is produced when muting or un-muting The speaker output stages also have a selectable gain boost of 1.5x (3.52dB). When this boost is enabled the output DC level is also level shifted (from AVDD/2 to 1.5xAVDD/2) to prevent the signal from clipping. A dedicated amplifier BUFDCOP, as shown in Figure 23, is used to perform the DC level shift operation. This buffer must be enabled using the BUFDCOPEN register bit for this operating mode. It should also be noted that if SPKVDD is not equal to or greater than 1.5xAVDD this boost mode may result in signals clipping. Table 42 summarises the effect of the SPKBOOST control bits. |
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