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SAA6588T Datasheet(PDF) 6 Page - NXP Semiconductors

Part No. SAA6588T
Description  RDS/RBDS pre-processor
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 6 page
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1997 Sep 01
6
Philips Semiconductors
Product specification
RDS/RBDS pre-processor
SAA6588
FUNCTIONAL DESCRIPTION
General
The following functions are performed by the SAA6588:
• Selection of the RDS/RBDS signal from the MPX input
signal
• 57 kHz carrier regeneration
• Demodulation of the RDS/RBDS signal
• Symbol decoding
• RDS/RBDS block detection
• Error detection and correction of transmission errors
• Fast block synchronization and synchronization control
• Detection of multi-path distortion and audio signal
pauses
• Determination of the signal quality
• Mode control of processing and RDS/RBDS data output
via I2C-bus interface
• Sensing of pause and multi-path, information via extra
output pins.
The block diagram of the RDS/RBDS pre-processor is
shown in Fig.1. For the application of the device only a few
external components are required. The pre-processors
functional blocks are described in the following sections.
RDS/RBDS signal demodulation
BAND-PASS FILTER
The band-pass filter has a centre frequency of 57 kHz.
It selects the RDS/RBDS sub-band from the multiplex
signal MPX and suppresses the audio signal components.
The filter block contains an analog anti-aliasing filter at the
input followed by an 8th order switched capacitor
band-pass filter and a reconstruction filter at the output.
CLOCKED COMPARATOR
The comparator digitizes the output signal from the 57 kHz
band-pass filter for further processing by the digital
RDS/RBDS demodulator. To attain high sensitivity and to
avoid phase distortion, the comparator input stage
contains an automatic offset compensation.
DEMODULATION
The demodulator provides all functions of the SAA6579
but has improved performance under weak signal
conditions.
The demodulator includes:
• 57 kHz carrier regeneration from the two sidebands
(Costas loop)
• Symbol integration over one RDS clock period
• Bi-phase symbol decoding
• Differential decoding
• Synchronization of RDS/RBDS output data with clock.
The RDS/RBDS demodulator recovers and regenerates
the continuously transmitted RDS/RBDS data stream out
of the multiplex signal (MPX) and provides the internal
signals clock (RDCL) and data (RDDA) for further
processing by the RDS/RBDS decoder block.
RDS/RBDS data processing
The RDS/RBDS data processing of the pre-processor
handles the complete processing and decoding of the
continuous serial RDS/RBDS demodulator output data
stream.
Different data processing modes are software controllable
by the external main controller via I2C-bus.
Processed RDS/RBDS data blocks, decoder status
information and signal quality information are also
available via I2C-bus.
RDS/RBDS DECODER
The RDS/RBDS decoder contains:
• RDS/RBDS block detection
• Error detection and correction
• Synchronization
• Flywheel for synchronization hold
• Bit slip correction
• Data processing control
• RDS/RBDS data output.




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