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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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ST7285C Datenblatt(PDF) 66 Page - STMicroelectronics |
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ST7285C Datenblatt(HTML) 66 Page - STMicroelectronics |
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66 / 117 page  66/117 ST7285C 4.7 RDS FILTER The Radio Data System (RDS) Filter peripheral consists of a Switched Capacitor (SC) bandpass filter centered on 57 KHz. This filter selects the RDS components from the multiplex radio signal. The filter output is directly used by the demodula- tor. The comparator limits the signal to digital lev- els. The comparator output feeds the RDS demod- ulator. 4.7.1 Features – 57KHz Switched Capacitor (SC) bandpass filter – Comparator – D/A converter for comparator Offset Compensa- tion by software – Power Down mode. Figure 32. RDS Filter Block Diagram RW FISEL PHI1 ADR RESET RDSREF TEST MODE SELECTO R D/A CONVERTE R (Offset-compensation) Comparator RDSCOMP STOP CLKIN (4.332MHz) RDSFIL TM2TM SMOOTHIN G FILTER PREFILTER (ANTI- BUFFER 8th ORDER SC FILTER ALIASING) MPX to Demodulator 10 µF 270pF |
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