DA-101 FM radio circuit chip

  
Radio FM radio chip circuits use different, it works slightly different, as shown in the use of DA-101 chip FM Figure radio circuit.
DA-101 FM radio circuit chip - schematic

FM radio broadcast program in the state of the headset as an antenna jack FM radio circuit, the signal received by the antenna coupling capacitor c58 into the U13 @ feet. This signal is a radio frequency carrier. U13 carried out in high-frequency amplification, mixer, IF amplifier, frequency and other processing solutions to bring up the audio signal by , @ pin output, and then sent to a digital decoder chip for processing, radio circuit U13 k {JI as by CPU control, Izc bus control signal to the CPU (DATA, CLK) are applied to the U13 , feet. Ul3 the radio power supply control signal is a control signal from the CPU applied to the gate VT5 by VT5 applied to the control power supply U13, so as to control the radio purposes.



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