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WM8973CLGEFL/V Datasheet(PDF) 35 Page - Wolfson Microelectronics plc |
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WM8973CLGEFL/V Datasheet(HTML) 35 Page - Wolfson Microelectronics plc |
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35 / 63 page  Production Data WM8973L w PD, Rev 4.5, December 2011 35 ANALOGUE OUTPUTS LOUT1/ROUT1 OUTPUTS The LOUT1 and ROUT1 pins can drive a 16 or 32 headphone or a line output (see Headphone Output and Line Output sections, respectively). The signal volume on LOUT1 and ROUT1 can be independently adjusted under software control by writing to LOUT1VOL and ROUT1VOL, respectively. Note that gains over 0dB may cause clipping if the signal is large. Any gain setting below 0101111 (minimum) mutes the output driver. The corresponding output pin remains at the same DC level (the reference voltage on the VREF pin), so that no click noise is produced when muting or un- muting. A zero cross detect on the analogue output may also be enabled when changing the gain setting to minimize audible clicks and zipper noise as the gain updates. If zero cross is enabled a timeout is also available to update the gain if a zero cross does not occur. This function may be enabled by setting TOEN in register R23 (17h). REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R2 (02h) LOUT1 Volume 8 LO1VU 0 Left Volume Update 0 = Store LOUT1VOL in intermediate latch (no gain change) 1 = Update left and right channel gains (left = LOUT1VOL, right = intermediate latch) 7 LO1ZC 0 Left zero cross enable 1 = Change gain on zero cross only 0 = Change gain immediately 6:0 LOUT1VOL [6:0] 1111001 (0dB) LOUT1 Volume 1111111 = +6dB … (80 steps) 0110000 = -67dB 0101111 to 0000000 = Analogue MUTE R3 (03h) ROUT1 Volume 8 RO1VU 0 Right Volume Update 0 = Store ROUT1VOL in intermediate latch (no gain change) 1 = Update left and right channel gains (left = intermediate latch, right = ROUT1VOL) 7 RO1ZC 0 Right zero cross enable 1 = Change gain on zero cross only 0 = Change gain immediately 6:0 ROUT1VOL [6:0] 1111001 ROUT1 Volume Similar to LOUT1VOL Table 25 LOUT1/ROUT1 Volume Control |
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