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WM8987L Datasheet(PDF) 32 Page - Wolfson Microelectronics plc |
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WM8987L Datasheet(HTML) 32 Page - Wolfson Microelectronics plc |
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32 / 58 page  WM8987L Pre-Production w PP Rev 3.0 January 2007 32 ANALOGUE OUTPUTS ROUT1 OUTPUT ROUT1 is the non-inverting left-channel output for BTL headsets (see page 53). It can drive 16 Ω or 32 Ω transducer loads. The ROUT1 signal volume can be adjusted under software control by writing to ROUT1VOL. Note that gains over 0dB may cause clipping if the signal is large. Any gain setting below 0101111 (minimum) mutes the output driver. The ROUT1 pin then 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. A timeout is also available to update the gain in the case that zero cross detection is enabled but no zero crossing occurs. This function may be enabled by setting TOEN in register R23 (17h). REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 8 RO1VU 0 ROUT1VOL Update For any change to ROUT1VOL to take effect, write ‘1’ to this bit. 7 RO1ZC 0 Right zero cross enable 1 = Change gain on zero cross only 0 = Change gain immediately R3 (03h) ROUT1 Volume 6:0 ROUT1VOL [6:0] 1111001 ROUT1 Volume 1111111 = +6dB … (80 steps) 0110000 = -67dB 0101111 to 0000000 = Analogue MUTE Table 25 ROUT1 Volume Control LOUT2/ROUT2 OUTPUTS LOUT2 and ROUT2 are analogue output pins similar to ROUT1. For BTL headsets, LOUT2 is the non-inverting left output and ROUT2 the inverting right output (with ROUT2INV=1); for single-ended headsets, LOUT2 is the left output and ROUT2 the right output. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 6:0 LOUT2VOL [6:0] 1111001 (0dB) LOUT2 volume 1111111 = +6dB … (80 steps) 0110000 = -67dB 0101111 to 0000000 = Analogue MUTE 7 LO2ZC 0 Left zero cross enable 1 = Change gain on zero cross only 0 = Change gain immediately R40 (28h) LOUT2 Volume 8 LO2VU 0 LOUT2 Volume Update 0 = Store LOUT2VOL in intermediate latch (no gain change) 1 = Update gain for both channels (left=LOUT2VOL, right=from intermediate latch) |
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