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WM8983
OUT3/OUT4 MIXERS AND OUTPUT STAGES
The OUT3/OUT4 pins 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 30.
The OUT3 and OUT4 output stages are powered from AVDD2 and AGND2. These individually-
controllable outputs also incorporate an optional 1.5x boost and level shifting stage.
Figure 30 OUT3 and OUT4 Mixers
OUT3 can provide a midrail reference, a left line output, or a mono mix line output
OUT4 can provide a midrail reference, a right line output, or a mono mix line output.
A 6dB attenuation function is provided for OUT4, to prevent clipping during mixing of left and right
signals. This function is enabled by the OUT4ATTN register bit.
PP Rev 1.1 August 2005
55
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
