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SAA6588T Datasheet(PDF) 6 Page - NXP Semiconductors |
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SAA6588T Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 28 page  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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