Only For Training And Service Purposes - LG -S310 Service Manual

3. TECHNICAL BRIEF
3.16.1 Audio AMP(WM9093)
The WM9093 is a high performance low power audio subsystem, including headphone driver and Class AB/D
earpiece/speaker driver. The Class D speaker driver supports 650mW output power at 3.6V, 1%THD. The
unique dual mode charge pump architecture provides ground referenced headphone outputs removing the
requirement for external coupling capacitors. Class G technology is integrated to increase the efficiency and
extend playback time by optimizing the headphone driver supply voltages according to the volume control.
The flexible input configuration allows single ended or differential stereo inputs. Mixers allow highly flexible
routing to the outputs. A 'Voice Bypass' path is also available for low-power voice applications. The WM9093 is
controlled using a two-wire I2C interface. An integrated oscillator generates all internal clocks, removing the
need to provide any external clock. Separate mixer and volume controls are provided for each headphone
and speaker driver. Automatic Gain Control limits the speaker output signal in order to prevent clipping. DC
offset correction to less than 1mV guarantees a pop/click-free headphone start up.
LGE Internal Use Only
[Figure 3.16.1-1] Block Diagram
[Figure 3.16.1-1] Block Diagram
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Only for training and service purposes