WM8978 Wolfson Microelectronics Ltd., WM8978 Datasheet - Page 58

• Manufacturer Part Number: WM8978
• Description: The WM8978 is a low power, high quality stereo codec designed for portable applications such as Digital still camera or Digital Camcorde
• Manufacturer: Wolfson Microelectronics Ltd.

WM8978
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OUT3/OUT4 MIXERS AND OUTPUT STAGES
Figure 28 OUT3 and OUT4 Mixers
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 28.
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.
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.
PTD Rev 2.6 November 2005
Preliminary Technical Data
58