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ST7285C Datasheet(HTML) 68 Page - STMicroelectronics

Part No. ST7285C
Description  8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST7285C Datasheet(HTML) 68 Page - STMicroelectronics

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ST7285C
4.8 RDS DEMODULATOR
The RDS demodulator is a fully digital Radio Data
System demodulator. The module includes 57KHz
carrier recovery, RDS clock (1187.5Hz) recovery,
bi-phase decoder, fast ARI indicator and signal
quality indicator. the module is controlled through
ST7 registers. The RDS signal is fed in through the
pin RDSCOMP. The reference frequency is de-
rived from the ST7 quartz oscillator. Therefore, the
quartz frequency must be 8.664MHz.
4.8.1 Features
– Pure digital RDS demodulator without external
components.
– Phase polarity data extractor.
– Phase integral data extractor.
– Data extractor selectable:
a) automatically via quality detector;
b) via software.
– Selectable quality indicator:
a) RDS signal quality;
b) polarity difference and integral data.
– Selectable time constant for 57KHz PLL.
– Selectable inhibit of PLL regulation to be used for
AF tests and temporary field strength weakness
(i.e. tunnels or other obstacles to radio recep-
tion).
– Fast ARI indicator, controlled by software.
Figure 33. RDS Demodulator Block Diagram
0
1
0
1
0
1
RDSCOMP
arp aren
lock upr
qen
lck1 lck0
57KHz PLL
Fast ARI Indicator
“Polarity” Bi-phase
Decoder
“Integral” Bi-phase
Decoder
Differential
Decoder 1
dat1
Differential
Decoder 2
dat2
sdat
RDS Dat
qual2
Quality
Detector
qual1
lck3 lck2 squal
RDS Clock
QUALITY
1187.5Hz Bit PLL


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