WM8983_06 Datasheet, PDF (73/123 Pages) Wolfson Microelectronics plc – Mobile Multimedia CODEC with 1W Speaker Driver

Production Data
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 38.
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 38 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.
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PD Rev 4.0 November 2006
73