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.

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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 Solutions include:

Analog Front End: AFEs are built around a high-speed ADC, and often include Low-Noise Amplifiers (LNA), frequency synthesizers, and high-speed Op-Amps. The LNA boosts the RF signal from the antenna. The frequency synthesizer 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. Depending on the speed of the signal the DAC outputs as compared to what the DSP or microcontroller can handle, a Digital Down counter may be required.

Power management: The power supply is connected to the 12V or 24V board net and regulates down/up to voltages for DSP, uC, memory and ICs and functions in the infotainment system. In some cases there may be 10 or more different power rails, making the design of the power supply a critical task when trying to design for size, cost and efficiency. Linear regulators with low quiescent current help reduce battery leakage current during standby operating modes (ignition off), are load dump voltage tolerant for directly battery connected devices, and need low drop out and tracking for low battery crank operation.

Beyond providing increased conversion efficiencies, switching power supplies provide EMI improvement with slew rate control of the switching FET, Frequency hopping, spread spectrum or triangulation method for attenuation of peak spectral energy, Low Iq, soft start for power sequencing and in rush current limitation, Phased switching for multiple SMPS's regulators to minimize input ripple current and lower input capacitance, higher switching frequency for smaller components (L and C's), and SVS functions for brown out indications

Communication interfaces allow data exchange between independent electronic modules in the car, as well as the remote sub modules of the BCM and RFID systems, and potentially external systems and devices like portable media players.

High Speed CAN (up to 1Mbps, ISO 119898) is a two wire, fault tolerant differential bus. With a wide input common mode range and differential signal technology it serves as the main vehicle bus type for connecting the various electronic modules in the car with each other. LIN supports low speed (up to 20 kbps) single bus wire networks, primarily used to communicate with remote sub functions.

The Audio input front end and audio output is often combined into a single Codec. On the output side ADCs convert the digital output an analog signal, which is amplified to the levels needed by the speakers or headphones used with the system. By using Class-D amplifiers the system’s power efficiency can exceed 90% while maintaining low THD. This improved efficiency leads to significant size, weight and heat reductions. TI’s class-D car audio solutions exhibit extremely low EMI levels and are being used in OEM systems with stringent EMC requirements.

The audio DSP performs I/Q demodulation and outputs digital audio and data. This includes functions like volume, treble, bass and sound effects, as well as more sophisticated features like effects processing such as Dolby® Pro Logic® II, SRS® Circle Surround™ II, TruSound and other audio algorithms.

Application Notes (3)

Title Abstract Type Size (KB) Date Views
HTM 8 KB 22 Sep 2010 734
HTM 8 KB 19 Nov 2008 1123
HTM 9 KB 11 Jul 2008 769
    

Reference Designs

Description Part Number Company Tool Type
12V Input to 27V Output at 5A Boost Converter for Audio Applications PMP3182 Texas Instruments Reference Designs
Multiphase Boost (24V @ 13A) for Automotive Audio PMP2445 Texas Instruments Reference Designs
Sync Buck(x2) (4.5V7A, Li-ion 1 cell 1.5A) for Pack Radio PMP2967 Texas Instruments Reference Designs

Selection and Solution Guides

Selection Guides (1)

Title Abstract Type Size (KB) Date Views
PDF 430 KB 23 Apr 2014 2547

Solution Guides (1)

Title Abstract Type Size (KB) Date Views
PDF 4.43 MB 08 Oct 2013 6275

Tools and Software

Name Part # Company Software/Tool Type
Code Composer Studio (CCS) Integrated Development Environment (IDE) CCSTUDIO Texas Instruments SW Development Tools, IDEs, Compilers

Product Bulletin & White Papers

White Papers (6)

Title Abstract Type Size (MB) Date Views
HTM 8 KB 20 Aug 2008 241
HTM 8 KB 20 Aug 2008 565
HTM 9 KB 18 Jul 2008 387
HTM 8 KB 18 Jul 2008 426
HTM 8 KB 18 Jul 2008 229
PDF 80 KB 24 May 2006 4

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