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TDA7478

November 2004

1

FEATURES

WITH IMPROVED DIGITAL SIGNAL

PROCESSING

FILTER (8th ORDER)

EXTERNAL COMPONENTS

WITHOUT EXTERNAL COMPONENTS

OPTIONAL)

2

DESCRIPTION

The TDA7478 recovers the additional inaudible RDS

information which is transmitted by FM radio broad-

casting stations and operates in accordance with the

EBU (European Broadcasting Union) specifications.

The device is made up of two sections: a cascaded

for precise RDS band selection and a demodulating

section that performs the extraction od RDS data

stream (RDDA) and clock (RDCL), to be further pro-

cessed by a suitable RDS decoder.

Output for RDS signal quality is also present.

SINGLE CHIP RDS DEMODULATOR

Figure 2. Block Diagram

2nd ORDER

ANTIALIASING

FILTER

8th ORDER

SC-BANDPASS

FILTER

MPX

4

270pF

-

+

8

FILOUT

12

3

VREF

100nF

10

µF

OSCILLATOR &

DIVIDER

57KHz PLL

POLARITY

BIPHASE DEC.

INTEGRAL

BIPHASE DEC.

1187.5Hz

PLL

MUX

0

1

DIFF. DECODER

TEST LOGIC

QUAL DET.

6

GND

11

EXTRES

14

13

5

9

16

7

1

D03AU1490

TM

10

RDDA

2

QUAL

N.U.

RDCL

FSEL

OSEL

OSCOUT

OSCIN

4.332MHz

C2 47pF

C1 27pF

15

T57

Figure 1. Packages

Table 1. Order Codes

Part Number

Package

TDA7478D

SO16

E-TDA7478AD

TSSOP16

SO16

TSSOP16

Rev. 2