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.

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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