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SAA6588

RDS/RBDS pre-processor

Philips Electronics 

Philips Semiconductors

RDS/RBDS pre-processor

Product specification

SAA6588

FEATURES

• Integrated switched capacitor filters

• Demodulation of the European Radio Data System

(RDS) or the USA Radio Broadcast Data System

(RBDS) signal

• RDS and RBDS block detection

• Error detection and correction

• Fast block synchronization

• Synchronization control (flywheel)

• Mode control for RDS/RBDS processing

• Different RDS/RBDS block information output modes

(e.g. A-block output mode)

• Fast I2C-bus interface

• Multi-path detector

• Signal quality detector with sensitivity adjustment

• Pause detector with pause level and time adjustment

• Alternatively oscillator frequency: n × 4.332 MHz

(n = 1 to 4)

• UART compatible with 17.328 MHz (n = 4)

• CMOS device

• Single supply voltage

• Extended temperature range (−40 to +85 °C).

GENERAL DESCRIPTION

Today most FM radio stations in Europe and meanwhile

also many FM/AM radio broadcasting stations in the USA

transmit the inaudible European RDS (Radio Data

System) or the USA RBDS (Radio Broadcast Data

System) informations respectively. Likewise nowadays

receivers, most car radios and also some home and

portable radios on the market include at least some of the

RDS features.

The RDS/RBDS system offers a large range of

applications by its many functions to be implemented. For

car radios the most important are:

• Program Service (PS) name

• Traffic Program (TP) identification

• Traffic Announcement (TA) signal

• Alternative Frequency (AF) list

• Program Identification (PI)

• Enhanced Other Networks (EON) information.

The RDS/RBDS pre-processor is a CMOS device that

integrates all RDS/RBDS relevant functions in one chip.

The IC contains filtering and demodulation of the

RDS/RBDS signal, symbol decoding, block

synchronization, error detection, error correction and

additional detectors for multi-path, signal quality and audio

signal pauses. The pre-processed RDS/RBDS information

is available via the I2C-bus.

The RDS/RBDS pre-processor replaces a number of ICs

and peripheral components used nowadays in car radio

concepts with RDS or RBDS features. The integration of

the relevant RDS/RBDS data processing functions

provides, in an economic manner, high performance of

RDS/RBDS processing and reduces the real-time

requirements for the main radio microcontroller

considerably. In addition it simplifies the development of

the RDS specific software for the main controller of the

radio set.

Compared with standard radio systems, RDS/RBDS

controlled radio systems additionally require an

RDS/RBDS demodulator with a 57 kHz band-pass filter,

information about the current reception situation (reception

quality, multi-path disturbance etc.), and additional

microcontroller power for RDS/RBDS data processing,

decoding and radio control.

The new RDS/RBDS pre-processor includes all these

specific functions and meets all requirements of a high end

RDS/RBDS radio. Moreover the timing requirements of the

set controller, regarding RDS/RBDS data processing are

reduced due to the integration of decoder functions, so

that the development of radio control software can be

concentrated specifically on radio set features.

1997 Sep 01

2

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