Service Manual Baseband Section
15
signal processing). AD9864 converts and processes the RF IF signal, and sends the undemodulated
serial digital I/Q signal to the DSP for processing. Then DAC5614 converts the digital signal output by
DSP to analog signal.
Figure 3-15 Diagram of Audio Section
3.3.2 Diagram of Signal Flow
The microphone converts the audio signal into electrical signal, which is amplified by PGA of the codec
and then sent to ADC of the codec for sampling. After digital audio processing, the signal is output to
DSP for processing. Then the signal is sent to DAC (TLV5614), which converts the signal to
modulation signal. After modulated and amplified in the RF module, the signal is sent out from the
antenna.
The RF signal received by the RF module is converted to digital signal by ADC (AD9864), and is then
sent to DSP for modulating and processing. Then the digital signal is sent to the digital audio
processor of the codec for digital audio processing, and is then converted into analog audio signal by
DAC of the codec. Finally the signal is amplified by the external audio amplifier (TDA8547TS) to drive
the speaker.
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