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[Discuss-gnuradio] AM/FM Chipset w/DSP IF

From: ed
Subject: [Discuss-gnuradio] AM/FM Chipset w/DSP IF
Date: Thu, 18 Jul 2002 18:58:58 -0400

STMicroelectronics Develops DSP-based Digital AM/FM Radio Chipset That Directly Digitizes Intermediate Frequency Combination of BiCMOS front end and 0.18um CMOS baseband processor improves performance and enables future IBOC-compatible products.

Geneva, July 16, 2002 - STMicroelectronics (NYSE: STM) today announced that the company is sampling a new AM/FM radio receiver chipset that digitizes directly the 10.7MHz intermediate frequency, allowing both enhanced performance and convergence with IBOC (In-Band On-Channel) digital radio in the future.

Aimed at the open market, the new chipset consists of the TDA7515 analog front-end chip, realized in high-performance 0.7-micron BiCMOS technology and the TDA7580 DSP digital baseband processor, realized in 0.18-micron CMOS. The DSP software embedded in the TDA7580 implements advanced algorithms that boost receiver performance. These algorithms have been jointly developed by ST and Bose Corporation, a recognized leader in audio system technology.

Direct digitization at the intermediate frequency makes the design more flexible and allows the implementation of complex equalization techniques that reduce multipath reception effects introduced by adjacent channels in very difficult weak-signal conditions. Moreover, the processor can adapt to changing conditions, maintaining excellent reception at all times. A further benefit of the software-based approach is that additional features can be added later without redesigning hardware, so products can be improved and differentiated simply by updating the firmware.

Because of the extensive use of digital techniques, the new chipset also smoothes the path towards dual standard IBOC/FM receivers, where a single DSP will have software to handle both, so that an IBOC-equipped radio can have a user-transparent FM fallback mode for borderline reception conditions. The digital approach combined with some features of the front-end chip also means that the chipset can support worldwide tuning frequencies, so a single application covers all markets with only changes in the software.

ST provides a complete DSP software solution for the TDA7580 that includes the implementation of algorithms developed jointly by ST and Bose Corporation. However, system designers using the chipset may also modify or extend portion of this standard software package to add new features or embed their own proprietary knowhow.

The TDA7515 and TDA7580 are supplied in 44- and 64-lead TQFP packages, respectively. Very few external components are required as most functions are performed digitally and because a hardware decoder for Radio Data System (RDS) is included in the TDA7580. The embedded decoder means that RDS decoding can be performed without using any DSP resources.

Samples of the TDA7515 and TDA7580 are available now and volume production is scheduled for the fourth quarter of 2002.

About STMicroelectronics
STMicroelectronics, the world's third largest semiconductor company, is a global leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivalled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today's convergence markets. The Company's shares are traded on the New York Stock Exchange, on Euronext Paris and on the Milan Stock Exchange. In 2001, the Company's net revenues were $6.36 billion and net earnings were $257.1 million. Further information on ST can be found at http://www.st.com.

For further information please contact:

STMicroelectronics Technical Press Relations:
Richard Stockdill
Tel : +33 4 5040 2558
Fax : +33 4 5040 2540
Saint Genis-Pouilly, France
E-mail: address@hidden

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