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Digital Radio

Digital radio is taking the old broadcast medium into the digital age. Digital radio is almost immune to the sort of interference that can make listening to today's conventional AM or FM radio less than satisfying.

Block Diagram


3.3V/5V I/O LDO 5V1A DC-DC Converter ADC AFE Analog +/-5V DC-DC Converter Audio Power Amp 1 Audio Power Amp 2 Audio Power Amp 3 Audio Power Amp 4 Audio Processor CAN Transceiver Clock Driver DDC DSP LDO DSP/CPU Ethernet PHY Transceiver Frequency Synthesizer Headphone Amp IF Amplifier LCD DC-DC Converter LED DC-DC Converter Supply Voltage Supervisor VCO Buffer Amplifier

Design Considerations

Digital radio is taking the old broadcast medium into the digital age with crystal-clear music, hundreds of new stations, on-demand radio, surround sound, rewind radio and more. TI with its strategic partners provide ready-to-go modules and reference designs for digital radio applications such as: automotive, home, portable and home hi-fi applications.

TI and its strategic partners, RadioScape and iBiquity, provide low-risk, cost-effective solutions for a quickly changing digital radio market.

TI's Solution includes:

  • Analog Front End - built around a high-speed ADC including Low-Noise Amplifiers (LNA), frequency synthesizers, and high-speed Op-Amps. The LNA boosts the RF signal from the antenna. The frequency syntahesizer generates a Local Oscillator (LO) signal that is mixed with the RF input to form the IF signal. The high-speed ADC converts the IF signal into digital samples.
  • Digital Down Converter (DDC) - performs down conversion, digital mixer, and decimation filtering to provide baseband I and Q output signals.
  • DSP/CPU - performs I/Q demodulation and outputs digital audio and data. The CPU controls the user interface, bus interface, and network interface.
  • Analog Output - uses stereo DACs and audio power Amps to send analog audio output to the speakers.
  • Clock Source - provides clocking for different data acquisition options and modes.
  • Power Conversion - converts input power to run various functional blocks.

Application Notes

  • Configuring External Interrupts on TMS320C672x Devices (spraaj3.htm, 9 KB)
    11 Jul 2008 Abstract
    

Product Bulletin & White Papers

White Papers

  • Audio Bitstream Coprocessor Architecture Illustration Using MP3 Decoder (spraaw3.htm, 8 KB)
    20 Aug 2008 Abstract
  • System Software & Power Management in a SoC for Portable Audio Players (spraaw6.htm, 8 KB)
    20 Aug 2008 Abstract
  • Automatic Level Controller for Speech Signals Using PID Controllers White Paper (spraaj4.htm, 9 KB)
    18 Jul 2008 Abstract
  • Cross Fade of Digital Audio Streams White Paper (spraaj5.htm, 8 KB)
    18 Jul 2008 Abstract
  • Bitstream Buffer in Audio Coprocessor White Paper (spraaj6.htm, 8 KB)
    18 Jul 2008 Abstract
  • High-Speed Audio Ripping, Encoding and Playback White Paper (spry083.pdf, 80 KB)
    24 May 2006 Download
  • Digital Signal Processors for Communications, Video, Infrastructure and Audio (spry069.pdf, 142 KB)
    17 May 2006 Download
  • Serial Rapid IO: Benefiting System Interconnects (spry070.pdf, 61 KB)
    17 May 2006 Download

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