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ST Microelectronics - AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER

Numéro de référence TDA7427
Description AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER
Fabricant ST Microelectronics 
Logo ST Microelectronics 





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TDA7427 fiche technique
® TDA7427
AM-FM RADIO FREQUENCY SYNTHESIZER
AND IF COUNTER
ON-CHIP REFERENCE OSCILLATOR AND
PROGRAMMABLE IF COUNTER
VHF INPUT AND PRECOUNTER FOR FRE-
QUENCIES UP TO 290MHz (SUITABLE FOR
DAB APPLICATION)
HF INPUT FOR FREQUENCIES UP TO
64MHz (SHORT WAVE BAND)
IN-LOCK DETECTOR FOR SEARCH/STOP
STATION FUNCTION
STAND-BY MODE FOR LOW POWER CON-
SUMPTION
HIGH CURRENT SOURCE FOR 0.5ms
LOCK-IN TIME
DIGITAL PORT EXTENSION WITH TWO
OUTPUTS FOR FLEXIBILITY IN APPLICA-
TION
FULLY PROGRAMMABLE BY I2C BUS
DESCRIPTION
The TDA7427 is a PLL frequency synthesizer
BLOCK DIAGRAM
DIP20
SO20
ORDERING NUMBERS: TDA7427(DIP20)
TDA7427D (SO20)
with an additional IF counting system that per-
forms all the functions needed in a complete PLL
radio tuning system for conventional and high
speed RDS tuners. The device has dedicated out-
puts for IN-LOCK detection and Search/Stop sta-
tion.
16
FM_IN
14
HFREF
17
AM_IN
SWITCH
AM/FM
PRECOUNTER
:32/33
SWITCH
SWM/DIR
OSCIN
OSCOUT
5
6
REF
OSCILLATOR
8
SCL
SDA
9
I2C BUS
INTERFACE
VDD2
VDD1
19
15
14 BIT PROG
CNT
16 BIT PROG
CNT
TIMER
5 BIT PROG.
CNT
SWITCH
SWM/DIR
11 BIT PROG
CNT
CONTROL
INLOCK
DETECTOR
PHASE
COMP
CHARGE
PUMP
SWITCH
LP1/LP2
13
DOUT1/INLOCK
2
LP_HC
3
LP_AM
1
LP_FM
- 20
LPOUT
+
VDD1
4
VREF
18
GNDan/GNDdig
TEST
LOGIC
POWER ON
RESET
10
IF_AM
11
IF_FM
11-21 BIT PROG CNT
D95AU418B
12
SSTOP
PORT EXTENSION
7
DOUT3
November 1999
1/21

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