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STMicro digital radio chipset directly digitizes IF

Posted: 19 Jul 2002 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? digital radio chipset? am receiver chipset? fm receiver chipset? radio receiver chipset?

STMicroelectronics has announced that it is sampling an AM/FM radio receiver chipset that directly digitizes 10.7MHz intermediate frequency (IF), allowing both enhanced performance and convergence with the upcoming IBOC (In-Band On-Channel) digital radio.

The chipset consists of the TDA7515 analog front-end and the TDA7580 DSP digital baseband processor. The latter has an embedded DSP software that implements advanced algorithms to boost receiver performance. These algorithms were co-developed with Bose Corp.

The company claims that direct digitization at the IF 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, continuously maintaining reception. A further benefit of the software-based approach is that additional features can be added by updating the firmware without redesigning hardware.

Manufactured using a 0.75m BiCMOS process, the TDA7515 is shipped a 44-lead TQFP casing. The TDA7580 is based on 0.185m CMOS technology and is encased in a 64-lead TQFP housing.

An embedded hardware decoder for Radio Data System (RDS) is also included into the TDA7580 to perform RDS decoding without using any DSP resources.

Samples of the TDA7515 and TDA7580 are available now with volume production scheduled for Q4 2002.

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