TDA7427A 查看數據表（PDF） - STMicroelectronics

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TDA7427A

AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER

STMicroelectronics 

®

TDA7427A

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 SIX OUT-

PUTS FOR FLEXIBILITY IN APPLICATION

FULLY PROGRAMMABLE BY I2C BUS

DESCRIPTION

The TDA7427A is a PLL frequency synthesizer

TSSOP28

SO28

ORDERING NUMBERS: TDA7427AAD (TSSOP28)

TDA7427AAD1 (SO28)

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.

BLOCK DIAGRAM

24

FM_IN

19

HFREF

25

AM_IN

SWITCH

AM/FM

PRECOUNTER

:32/33

SWITCH

SWM/DIR

5 BIT PROG.

COUNTER

SWITCH

SWM/DIR

9

OSCIN

10

OSCOUT

REF

OSCILLATOR

ADDR

SCL

SDA

20

12 I2C BUS

13 INTERFACE

VDD2

VDD1

GNDDIG

IF_AM

IF_FM

27

SUPPLY

21

&

POWER-ON

22 RESET

14 BIT PROG

COUNTER

14

SWITCH

15

AM/FM

16 BIT PROG

COUNTER

11 BIT PROG

COUNTER

TIMER

CONTROL

11-21 BIT PROG COUNTER

D95AU372D

INLOCK

DETECTOR

PHASE

COMP

CHARGE

PUMP

SWITCH 17

OUT

2

3

SWITCH

1

LP1/LP2

DOUT1/INLOCK

LP_HC

LP_AM

LP_FM

-

28

LP_OUT

+

VDD1

4

VREF

26

GNDAN

TEST

LOGIC

PORT EXTENSION

16

SSTOP

18

5

6

7

8

DOUT2 DOUT3 DOUT4 DOUT5 DOUT6

July 1998

1/21

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