WM8976
Pre-Production
OUT3/OUT4 MIXERS AND OUTPUT STAGES
The OUT3/OUT4 pins can provide an additional stereo line output, a mono output, or a pseudo
ground connection for headphones. There is a dedicated analogue mixer for OUT3 and one for
OUT4 as shown in Figure 24.
The OUT3 and OUT4 output stages are powered from SPKVDD and SPKGND. The individually
controllable outputs also incorporate an optional 1.5x boost and level shifting stage.
Figure 24 OUT3 and OUT4 Mixers
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.
PP Rev 3.0 April 2006
56
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
