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.
Summary of Contents for PD70X Series
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Page 57: ...PD70X PD70XG PD78X PD78XG HD705 HD705G HD785 HD785G Block Diagram Baseband Section 47 ...
Page 127: ...Service Manual UHF1 400 470MHz Information 117 Transmitter Circuit ...
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Page 146: ...PD70X PD70XG PD78X PD78XG HD705 HD705G HD785 HD785G Block Diagram Baseband Section 136 ...
Page 217: ...Service Manual UHF2 450 520MHz Information 207 Transmitter Circuit ...
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Page 236: ...PD70X PD70XG PD78X PD78XG HD705 HD705G HD785 HD785G Block Diagram Baseband Section 226 ...
Page 307: ...Service Manual UHF3 350 400MHz Information 297 Transmitter Circuit ...
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Page 421: ...PD70X PD70XG PD78X PD78XG HD705 HD705G HD785 HD785G Block Diagram Baseband Section 411 ...
Page 494: ...VHF 136 174MHz Information Service Manual 484 Transmitter Circuit ...