Summary of FM radio using TEA5767 and PIC16F877A micro-controller
The article describes the TEA5767 single-chip FM stereo radio, highlighting its high sensitivity, integrated low-noise RF amplifier, and support for various FM bands including US, Europe, and Japan. It features an internal FM demodulator, PLL synthesizer tuning, I2C or 3-wire bus communication, soft mute, stereo noise cancelling, and autonomous search tuning. The chip operates with crystal or external frequency references and includes programmable ports and standby mode, making it ideal for compact FM radio projects when combined with microcontrollers like the PIC16F877A.
Parts used in the TEA5767 single-chip FM stereo radio:
- TEA5767 FM stereo radio IC
- Low-noise RF input amplifier (integrated in TEA5767)
- Oscillator crystal (32.768 kHz or 13 MHz)
- Fixed chip inductors (for LC tuner oscillator)
- Microcontroller (e.g., PIC16F877A)
- Power supply components
- Bus interface pins and connectors (I2C or 3-wire)
- External reference frequency source (6.5 MHz, optional)
TEA5767 single-chip FM stereo radio.
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* High sensitivity due to integrated low-noise RF input amplifier
* FM mixer for conversion to IF of the US/Europe (87.5 MHz to 108 MHz) and Japanese
(76 MHz to 91 MHz) FM band
* Preset tuning to receive Japanese TV audio up to 108 MHz
* RF Automatic Gain Control (AGC) circuit
* LC tuner oscillator operating with low cost fixed chip inductors
* FM IF selectivity performed internally
* No external discriminator needed due to fully integrated FM demodulator
* Crystal reference frequency oscillator; the oscillator operates with a 32.768 kHz clock
crystal or with a 13 MHz crystal and with an externally applied 6.5 MHz reference
frequency
* Phase-locked loop (PLL) synthesizer tuning system
* I2C-bus and 3-wire bus, selectable via pin BUSMODE
* 7-bit IF counter output via the bus
* 4-bit level information output via the bus
* Soft mute
* Signal dependent mono to stereo blend [Stereo Noise Cancelling (SNC)]
* Signal dependent High Cut Control (HCC)
* Soft mute, SNC and HCC can be switched off via the bus
* Adjustment-free stereo decoder
* Autonomous search tuning function
* Standby mode
* Two software programmable ports
* Bus enable line to switch the bus input and output lines into 3-state mode
For more detail: FM radio using TEA5767 and PIC16F877A micro-controller
