VS1005g Datasheet
10 VS1005 PERIPHERALS AND REGISTERS
10.17 FM Receiver
The FM receiver in vs1005 is capable of receiving frequency modulated (FM) signals from
76MHz to 108MHz. The operation of FM receiver requires several modules:
• RF modules : VCO, LNA and Mixer
• Analog modules : Muxes, amplifiers and ADCs
• Digital modules : Digital filters and FM demodulator
As was shown in figure 17. the FM receiver uses partially the same signal paths as the ADCs.
When FM demodulator is used the stereo AD filter must be configured to 192kHz sample rate
and the decimation filter enabled with input selection from FM demodulator. Other modules
must be powered up and FM path is selected to analog output.
10.17.1 Configuring RF and Analog Modules for FM Receiver Mode
The front end configuration of the FM receiver is shown in figure 18. The VCO is digitally
controlled and set to an FM band as is explained in section “Configuring FM Demodulator”.
Figure 18: Block Diagram of FM Receiver, RF and analog section
Version: 0.2, 2012-03-16
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