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WM8758CBGEFL/V Datasheet(PDF) 44 Page - Wolfson Microelectronics plc |
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WM8758CBGEFL/V Datasheet(HTML) 44 Page - Wolfson Microelectronics plc |
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44 / 90 page  WM8758B Production Data w PD, Rev 4.4, January 2012 44 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R11 Left DAC Digital Volume 7:0 DACLVOL [7:0] 11111111 ( 0dB ) Left DAC Digital Volume Control 0000 0000 = Digital Mute 0000 0001 = -127dB 0000 0010 = -126.5dB ... 0.5dB steps up to 1111 1111 = 0dB 8 DACVU Not latched DAC left and DAC right volume do not update until a 1 is written to DACVU (in reg 11 or 12) R12 Right DAC Digital Volume 7:0 DACRVOL [7:0] 11111111 ( 0dB ) Right DAC Digital Volume Control 0000 0000 = Digital Mute 0000 0001 = -127dB 0000 0010 = -126.5dB ... 0.5dB steps up to 1111 1111 = 0dB 8 DACVU Not latched DAC left and DAC right volume do not update until a 1 is written to DACVU (in reg 11 or 12) Table 22 DAC Digital Volume Control Note: An additional gain of up to 12dB can be added using the gain block embedded in the digital peak limiter circuit (see DAC OUTPUT LIMITER section). 5-BAND EQUALISER A 5-band graphic equalizer function which can be used to change the output frequency levels to suit the environment. This can be applied to the ADC or DAC path and is described in the 5-BAND EQUALISER section for further details on this feature. 3-D ENHANCEMENT The WM8758B has an advanced digital 3-D enhancement feature which can be used to vary the perceived stereo separation of the left and right channels. Like the 5-band equalizer this feature can be applied to either the ADC record path or the DAC equalizer path but not both simultaneously. Refer to the 3-D STEREO ENHANCEMENT section for further details on this feature. DAC DIGITAL OUTPUT LIMITER The WM8758B has a digital output limiter function. The operation of this is shown in Figure 23. In this diagram the upper graph shows the envelope of the input/output signals and the lower graph shows the gain characteristic. |
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