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WM8750LEFL/R 数据表(PDF) 32 Page - Wolfson Microelectronics plc |
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WM8750LEFL/R 数据表(HTML) 32 Page - Wolfson Microelectronics plc |
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32 / 56 page  WM8750L Product Preview PP Rev 1.77 May 2003 32 LOUT2/ROUT2 OUTPUTS The LOUT2 and ROUT2 output pins are essentially similar to LOUT1 and ROUT1, but they are independently controlled and can also drive an 8 Ω mono speaker (see Speaker Output section). For speaker drive, the ROUT2 signal must be inverted (ROUT2INV = 1), so that the left and right channel are mixed to mono in the speaker [L–(-R) = L+R]. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 6:0 LOUT2VOL [6:0] 1111001 (0dB) Similar to LOUT1VOL 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 Same as LO1VU 6:0 ROUT2VOL [6:0] 1111001 (0dB) Similar ROUT1VOL 7 RO2ZC 0 Left zero cross enable 1 = Change gain on zero cross only 0 = Change gain immediately R41 (29h) ROUT2 Volume 8 RO2VU 0 Same as RO1VU R24 (18h) Additional Control (2) 4 ROUT2INV 0 ROUT2 Invert 0 = No Inversion (0 ° phase shift) 1 = Signal inverted (180 ° phase shift) Table 24 LOUT2/ROUT2 Volume Control MONO OUTPUT The MONOOUT pin can drive a mono line output. The signal volume on MONOOUT can be adjusted under software control by writing to MONOOUTVOL. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 6:0 MONOOUT VOL [6:0] 1111001 (0dB) MONOOUT Volume 1111111 = +6dB … (80 steps) 0110000 = -67dB 0101111 to 0000000 = Analogue MUTE R42 (2Ah) MONOOUT Volume 7 MOZC 0 MONOOUT zero cross enable 1 = Change gain on zero cross only 0 = Change gain immediately Table 25 MONOOUT Volume Control OUT3 OUTPUT The OUT3 pin can drive a 16 Ω or 32Ω headphone or a line output or be used as a DC reference for a headphone output (see Headphone Output section). It can be selected to either drive out an inverted ROUT1 or inverted MONOOUT for e.g. an earpiece drive between OUT3 and LOUT1 or differential output between OUT3 and MONOOUT. OUT3SW selects the mode of operation required. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R24 (18h) Additional Control (2) 8:7 OUT3SW [1:0] 00 OUT3 select 00 : VREF 01 : ROUT1 signal (volume controlled by ROUT1VOL) 10 : MONOOUT 11 : right mixer output (no volume control through ROUT1VOL) Table 26 OUT3 Select |
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