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WM9711 Datasheet(PDF) 24 Page - Wolfson Microelectronics plc |
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WM9711 Datasheet(HTML) 24 Page - Wolfson Microelectronics plc |
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24 / 66 page  WM9711L Production Data w PD Rev 4.1 April 2004 24 AUDIO DACS STEREO DAC The WM9711L has a stereo sigma-delta DAC that achieves high quality audio playback at low power consumption. Digital tone control, adaptive bass boost and 3-D enhancement functions operate on the digital audio data before it is passed to the stereo DAC. (Contrary to the AC’97 specification, they have no effect on analogue input signals or signals played through the auxiliary DAC. Nevertheless, the ID2 and ID5 bits in the reset register, 00h, are set to ‘1’ to indicate that the WM9711L supports tone control and bass boost.) The DAC output has a PGA for volume control. The DAC sample rate can be controlled by writing to a control register (see “Variable Rate Audio”). It is independent of the ADC sample rate. The left and right DACs can be separately powered down using the PD13 and PD14 control bits, whereas the PR1 bit disables both DACs (see “Power Management” section). STEREO DAC VOLUME The volume of the DAC output signal is controlled by a PGA (Programmable Gain Amplifier). It can be mixed into the headphone, speaker and phone output paths (see “Audio Mixers”). REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 15 D2H 1 Mute DAC path to headphone mixer 1: Mute, 0: No mute (ON) 14 D2S 1 Mute DAC path to speaker mixer 1: Mute, 0: No mute (ON) 13 D2P 1 Mute DAC path to phone mixer 1: Mute, 0: No mute (ON) 12:8 DACL VOL 01000 (0dB) Left DAC Volume 00000: +12dB … (1.5dB steps) 11111: -34.5dB 18h DAC Volume 4:0 DACR VOL 01000 (0dB) Right DAC Volume similar to DACLVOL 15 AMUTE N/A Read-only bit to indicate auto-muting 1: DAC auto-muted 0: DAC not muted 5Ch Additional Functions (1) 7 AMEN 0 DAC Auto-Mute Enable 1: Automatically mutes analogue output of stereo DAC if digital input is zero 0: Auto-mute OFF Table 11 Stereo DAC Volume Control |
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