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WM8980 Datasheet(PDF) 59 Page - Wolfson Microelectronics plc |
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WM8980 Datasheet(HTML) 59 Page - Wolfson Microelectronics plc |
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59 / 112 page  Pre-Production WM8980 w PP Rev 3.1 March 2007 59 OUT3 can provide a buffered midrail headphone pseudo-ground, or a left line output. OUT4 can provide a buffered midrail headphone pseudo-ground, a right line output, or a mono mix output. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 6 OUT3MUTE 0 0 = Output stage outputs OUT3 mixer 1 = Output stage muted – drives out VMID. Can be used as VMID buffer in this mode. 3 OUT4_2OUT3 0 OUT4 mixer output to OUT3 0 = disabled 1= enabled 2 BYPL2OUT3 0 Left ADC input to OUT3 0 = disabled 1= enabled 1 LMIX2OUT3 0 Left DAC mixer to OUT3 0 = disabled 1= enabled R56 OUT3 mixer control 0 LDAC2OUT3 1 Left DAC output to OUT3 0 = disabled 1= enabled 6 OUT4MUTE 0 0 = Output stage outputs OUT4 mixer 1 = Output stage muted – drives out VMID. Can be used as VMID buffer in this mode. 5 HALFSIG 0 0=OUT4 normal output 1=OUT4 attenuated by 6dB 4 LMIX2OUT4 0 Left DAC mixer to OUT4 0 = disabled 1= enabled 3 LDAC2OUT4 0 Left DAC to OUT4 0 = disabled 1= enabled 2 BYPR2OUT4 0 Right ADC input to OUT4 0 = disabled 1= enabled 1 RMIX2OUT4 0 Right DAC mixer to OUT4 0 = disabled 1= enabled R57 OUT4 mixer control 0 RDAC2OUT4 1 Right DAC output to OUT4 0 = disabled 1= enabled Table 41 OUT3/OUT4 Mixer Registers The OUT3 and OUT4 output stages each have a selectable gain boost of 1.5x (3.52dB). When this boost is enabled the output DC level is also level shifted (from AVDD/2 to 1.5xAVDD/2) to prevent the signal from clipping. A dedicated amplifier BUFDCOP, as shown in Figure 29, is used to perform the DC level shift operation. This buffer must be enabled using the BUFDCOPEN register bit for this operating mode. It should also be noted that if SPKVDD is not equal to or greater than 1.5xAVDD this boost mode may result in signals clipping. Table 38 summarises the effect of the OUT3BOOST and OUT4BOOST control bits. |
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