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WM9711 Datasheet(PDF) 27 Page - Wolfson Microelectronics plc |
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WM9711 Datasheet(HTML) 27 Page - Wolfson Microelectronics plc |
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27 / 66 page  Production Data WM9711L w PD Rev 4.1 April 2004 27 AUXILIARY DAC AUXDAC is a simple 12-bit mono DAC. It can be used to generate DC signals (with the numeric input written into a control register), or AC signals such as telephone-quality ring tones or system beeps (with the input signal supplied through an AC-Link slot). In AC mode (XSLE = 1), the input data is binary offset coded; in DC mode (XSLE = 0), there is no offset. The analogue output of AUXDAC is routed directly into the output mixers. The signal gain into each mixer can be adjusted at the mixer inputs using control register 12h. In slot mode (XSLE = 1), the AUXDAC also supports variable sample rates (See “Variable Rate Audio” section). When the auxiliary DAC is not used, it can be powered down by setting AXE = 0. This is also the default setting. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 15 XSLE 0 AUXDAC input selection 0: from AUXDACVAL (for DC signals) 1: from AC-Link slot selected by AUXDACSLT (for AC signals) 14:12 AUXDAC SLT 000 AUXDAC Input Selection 000 – Slot 5, bits 8-19 (with XSLE=1) 001 – Slot 6, bits 8-19 (with XSLE=1) 010 – Slot 7, bits 8-19 (with XSLE=1) 011 – Slot 8, bits 8-19 (with XSLE=1) 100 – Slot 9, bits 8-19 (with XSLE=1) 101 – Slot 10, bits 8-19 (with XSLE=1) 110 – Slot 11, bits 8-19 (with XSLE=1) 111 – RESERVED (do not use) 64h AUDAC Input Control 11:0 AUXDAC VAL 000h AUXDAC Digital Input (with XSLE=0) 000h: minimum FFFh: full-scale 15 A2H 1 Mute AUXDAC path to headphone mixer 1: Mute, 0: No mute (ON) 14:12 A2HVOL 010 (0dB) AUXDAC to headphone mixer gain 000: +6dB … (3dB steps) 111: -15dB 11 A2S 1 Mute AUXDAC path to speaker mixer 1: Mute, 0: No mute (ON) 10:8 A2SVOL 010 (0dB) AUXDAC to speaker mixer gain 000: +6dB … (3dB steps) 111: -15dB 7 A2P 1 Mute AUXDAC path to phone mixer 1: Mute, 0: No mute (ON) 6:4 A2PVOL 010 (0dB) AUXDAC to phone mixer gain 000: +6dB … (3dB steps) 111: -15dB 12h AUXDAC Output Control 0 AXE 0 0: AUXDAC off 1: AUXDAC enabled Table 14 AUXDAC Control |
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