參數(shù)資料
型號: ST7285C
廠商: 意法半導體
英文描述: 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES
中文描述: 8位微控制器48,000鐵路發(fā)展策略光盤,3K內(nèi)存,ADC,兩個定時器,2個SPI,I2C和脊髓損傷接口
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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
R
I
TEST MODE
SELECTOR
D/A CONVERTER
(Offset-compensation)
Comparator
RDSCOMP
STOP
CLKIN
(4.332MHz)
RDSFIL
TM2TM
SMOOTHING
FILTER
PREFILTER
(ANTI-
ALIASING)
BUFFER
8th ORDER
SC FILTER
MPX
to Demodulator
10
μ
F
270p
F
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