TDA7479 datasheet(1/8 Pages) STMICROELECTRONICS

Numer części	TDA7479

Szczegółowy opis	SINGLE CHIP RDS DEMODULATOR FILTER

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Producent	STMICROELECTRONICS [STMicroelectronics]

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TDA7479

December 2004

1

FEATURES

■ VERY HIGH RDS DEMODULATION QUALITY

WITH IMPROVED DIGITAL SIGNAL

PROCESSING

■ HIGH PERFORMANCE, 57KHz BANDPASS

FILTER (8th ORDER)

■ FILTER ADJUSTMENT FREE AND WITHOUT

EXTERNAL COMPONENTS

■ PURELY DIGITAL RDS DEMODULATION

WITHOUT EXTERNAL COMPONENTS

■ ARI (SK INDICATION) AND RDS SIGNAL

QUALITY OUTPUT

■ 4.332MHz CRYSTAL OSCILLATOR(8.664 and

17.328MHz OPTIONAL)

■ LOW NOISE CMOS TECHNOLOGY

■ LOW RADIATION

2

DESCRIPTION

The TDA7479 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

antialiasing + switched capacitors 8th bandpass filter

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.

Outputs for RDS signal quality and ARI indication are

also present.

SINGLE CHIP RDS DEMODULATOR + FILTER

Figure 2. Block Diagram

2nd ORDER

ANTIALIASING

FILTER

8th ORDER

SC-BANDPASS

FILTER

MPX

4

270pF

-

+

8

FILOUT

12

VS

3

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.

6

GND

11

EXTRES

14

13

5

9

16

7

1

D97AU751A

TM

10

RDDA

2

QUAL

ARI

RDCL

FSEL

OSEL

OSCOUT

OSCIN

4.332MHz

C2 47pF

C1 27pF

15

T57

Figure 1. Packages

Table 1. Order Codes

Part Number

Package

TDA7479D

SO16

TDA7479AD

TSSOP16

SO16

TSSOP16

Rev. 6

Podobny numer części - TDA7479

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