CJMCU-470 Si4703 Módulo de radio FM Placa de desarrollo estéreo de sintonización automática

The Si4703-C is a complete FM tuner receiver system from FM radio input to stereo output. It integrates an on-chip digital processor to handle the symbol decoding block synchronization, error detection and error correction functions required by the Radio Data Broadcasting System (RBDS). The FM receiver uses a mixer to reduce the RF signal to the low intermediate frequency, thereby reducing the need for additional peripheral circuit devices. The automatic frequency control (AFC) regulates the voltage-controlled oscillator to generate an orthogonal local signal to the mixer. The output of the orthogonal mixer is amplified, filtered and digitized by a high-resolution analog-to-digital converter (ADC). Digital signal processing (DSP) can perform channel selection, FM demodulation and stereo audio processing. The internal automatic gain (AGC) circuit controls the gain of the low-noise amplifier (LNA) to achieve higher sensitivity and stronger noise suppression capability. The on-chip integrated LDO regulator can be directly connected to the battery, and the headphone jack can be plugged into headphones to serve as an RF receiving antenna. This advanced architecture has more outstanding performance compared with the traditional simulation architecture. The module is also on-board with a 150mW stereo power amplifier featuring thermal protection and short-circuit protection, as well as a 3.5mm headphone jack. When connected to a single-chip microcomputer, it can control volume, automatically or manually search for channels, mute software or hardware, and measure signal strength.