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3.12 Audio Front-End
This section describes the content of the Audio Frontend & Measurement Sub-System (integrated Mixed-signal
part).
The MS (mixed signal) part comprises the following functionality:
• Headset amplifier (uni- and bi-polar signal driver) to connect stereo headset with 2x16
• Earpiece amplifier to connect 16
• Loudspeaker amplifier (class-D) to connect 8
• 2 differential microphone inputs
• 2 microphone supply generators (1 ultra low power) • Charge pump for generating negative voltage in order
to support bipolar audio
• Digital Microphone interface
– One 2 MHz clock output, 2 input for Dual-Digital microphone
• Integrated FM radio
• Measurement ADC
– Measurement of external signal applied to Measurement Interface (M0..M2)
– Measurement of internal signals: accessory detection (signal from PMU), charge voltage (signal from PMU),
auxialiary temperature sensor (signal from PMU), 1 spare port
• Temperature sensor
LGE Internal Use Only
earpiece (mono) and drive 100 mW
Loudspeaker (mono) and drive 700 mW
Figure 3.12.1 Audio Section Overview
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3. TECHNICAL BRIEF
and drive 2x30 mW
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