TDA7331 datasheet(1/7 Pages) STMICROELECTRONICS

Numer części	TDA7331

Szczegółowy opis	SINGLE CHIP RDS DEMODULATOR FILTER

PDF	7 Pages

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Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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VERY HIGH RDS DEMODULATION QUALITY

WITH IMPROVED DIGITAL SIGNAL PROC-

ESSING

HIGH PERFORMANCE, 57KHz BANDPASS

FILTER (8th ORDER)

PURELY DIGITAL RDS DEMODULATION

WITHOUT EXTERNAL COMPONENTS

ARI INDICATION AND RDS SIGNAL QUAL-

ITY OUTPUTS

4.332MHz CRYSTAL OSCILLATOR

(8.664 and 17.328MHz SELECTABLE OP-

TIONS)

LOW NOISE CMOS TECHNOLOGY

LOW RADIATION

DESCRIPTION

The

TDA7331,

an

improved

version

of

TDA7330B, recovers the additional inaudible

RDS information which is transmitted by FM radio

broadcasting stations and operates in accord-

ance with the EBU (European Broadcasting Un-

ion) specifications.

The device is made up of two sections: a cas-

caded antialiasing + switched capacitors band-

pass filter for precise RDS band selection and a

demodulating section that performs the extraction

od RDS data stream (RDDA) and clock (RDCL),

to be furher processed by a suitable RDS de-

coder.

Outputs for RDS signal quality and ARI indication

are also present.

February 1998

2nd ORDER

ANTIALIASING

FILTER

8th ORDER

SC-BANDPASS

FILTER

MPX

1

270pF

-

+

4

FILOUT

16

VS

2

VREF

100nF

10

µF

OSCILLATOR &

DIVIDER

57KHz PLL

FAST ARI

INDICATOR

POLARITY

BIPHASE DEC.

INTEGRAL

BIPHASE DEC.

1187.5Hz

PLL

MUX

0

1

DIFF. DECODER

TEST LOGIC

QUAL DET.

5

GND

N.C.

6,7,8,17

20

EXTRES

9

10

3

18

12

15

14

D97AU686B

TM

19

RDDA

13

QUAL

ARI

RDCL

FSEL

OSEL

OSCOUT

OSCIN

4.332MHz

C2 47pF

C1 27pF

11

T57

BLOCK DIAGRAM and TEST CIRCUIT

TDA7331

SINGLE CHIP RDS DEMODULATOR + FILTER

DIP20

SO20

ORDERING NUMBERS:

TDA7331

TDA7331D

1/7

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