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LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
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̲ Output Amplifier
The different output buffers in X-GOLD™213 are driven by the outputs of the selection block. The
differential earpiece driver can be used to drive a 16 ȳ earpiece and works in differential. The two single
ended headset drivers can be used to drive a 16 ȳ headset. They can work unipolar mode, where an AC
coupling of the headset might be needed, or can work also in bipolor mode. The differential loudspeaker
driver can be used to drive a 8 ȳ loudspeaker. As it is a class-D amplifier the needed suppression of the
higher harmonics of the switching signals
has to be achieved by the external circuitry. The buffers are designed to be short circuit protected.
3. TECHNICAL BRIEF
Figure 3.12.3 Switching for R/L DACs onto Buffers
̲ Digital-to-analog converters
The multi-bit oversampling DACs of the X-GOLD™213 audio front-end convert the 16-bit data words
coming from the digital interpolation filters to analogue signals.