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廬

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 I

2

C BUS

DESCRIPTION

The TDA7427A is a PLL frequency synthesizer

BLOCK DIAGRAM

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.

SWITCH

OUT

FM_IN

24

PRECOUNTER

:32/33

HFREF

19

SWITCH

AM/FM

SWITCH

SWM/DIR

SWITCH

SWM/DIR

PHASE

COMP

CHARGE

PUMP

-

+

VDD1

5 BIT PROG.

COUNTER

INLOCK

DETECTOR

17

DOUT1/INLOCK

2

3

SWITCH

LP1/LP2

1

LP_HC

LP_AM

LP_FM

AM_IN

25

28

LP_OUT

11 BIT PROG

COUNTER

OSCIN

OSCOUT

9

10

REF

OSCILLATOR

16 BIT PROG

COUNTER

4

VREF

ADDR

SCL

SDA

20

12

13

I2C BUS

INTERFACE

26

GNDAN

VDD2

VDD1

GNDDIG

IF_AM

27

21

22

14

SWITCH

AM/FM

11-21 BIT PROG COUNTER

PORT EXTENSION

SUPPLY

&

POWER-ON

RESET

14 BIT PROG

COUNTER

TIMER

CONTROL

TEST

LOGIC

IF_FM

15

16

D95AU372D

18

DOUT2

5

DOUT3

6

DOUT4

7

DOUT5

8

DOUT6

SSTOP

July 1998

1/21

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