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TDA7331

SINGLE CHIP RDS DEMODULATOR + FILTER

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-

BLOCK DIAGRAM and TEST CIRCUIT

C1 27pF

4.332MHz

C2 47pF

DIP20

SO20

ORDERING NUMBERS:

TDA7331

TDA7331D

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.

T57

11

1

MPX

270pF

2nd ORDER

ANTIALIASING

FILTER

OSCIN

10

OSCOUT

9

3

OSCILLATOR &

DIVIDER

18

OSEL

FSEL

12

FILOUT

4

8th ORDER

SC-BANDPASS

FILTER

57KHz PLL

1187.5Hz

PLL

15

14

V

S

100nF

VREF

10碌F

INTEGRAL

BIPHASE DEC.

2

-

+

POLARITY

BIPHASE DEC.

0

1

MUX

DIFF. DECODER

13

16

FAST ARI

INDICATOR

QUAL DET.

RDCL

ARI

QUAL

RDDA

19

TEST LOGIC

TM

5

GND

6,7,8,17

N.C.

20

EXTRES

D97AU686B

February 1998

1/7

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