TDA7427D 查看數據表（PDF） - STMicroelectronics

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TDA7427D

AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER

STMicroelectronics 

®

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

5

OSCIN

6

OSCOUT

REF

OSCILLATOR

8

SCL

SDA

9

I2C BUS

INTERFACE

19

VDD2

15

VDD1

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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