LG -V909DW Service Manual page 45

3. TECHNICAL BRIEF
3.11.3. Audio codec(Wolfson_wm8994)
The WM8994is a highly integrated ultra-low power hi-fi CODEC designed for smart phones and other
portable devices rich in multimedia features.
An integrated stereo class D/AB speaker driver and class W headphone driver minimize power consumption
during audio playback.
The device requires only two voltage supplies, with all other internal supply rails generated from integrated
LDOs.
Stereo full duplex asynchronous sample rate conversion and multi-channel digital mixing combined with
powerful analogue mixing allow the device to support a huge range of different architectures and use cases.
A fully programmable parametric EQ provides speaker compensation and a dynamic range controller can be
used in the ADC or DAC paths for maintaining a constant signal level, maximizing loudness and protecting
speakers against overloading and clipping.
A smart digital microphone interface provides power regulation, a low jitter clock output and decimation
filters for up to four digital microphones. A MIC activity detect with interrupt is available.
Active ground loop noise rejection and DC offset correction help prevent pop noise and suppress ground
noise on the headphone outputs.
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