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ST7285C Datasheet(HTML) 66 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) 66 Page - STMicroelectronics

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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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