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STMicroelectronics


E-TDA7478AD

SINGLE CHIP RDS DEMODULATOR

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TDA7478
SINGLE CHIP RDS DEMODULATOR
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 RDS SIGNAL QUALITY OUTPUT 4.332MHz CRYSTAL OSCILLATOR(8.664MHz OPTIONAL) LOW NOISE CMOS TECHNOLOGY LOW RADIATION

Figure 1. Packages

■ ■ ■ ■ ■ ■ ■

SO16

TSSOP16

Table 1. Order Codes
Part Number TDA7478D E-TDA7478AD Package SO16 TSSOP16

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 processed by a suitable RDS decoder. Output for RDS signal quality is also present.

2

DESCRIPTION

The TDA7478 recovers the additional inaudible RDS information which is transmitted by FM radio broadcasting stations and operates in accordance with the Figure 2. Block Diagram

C1 27pF

4.332MHz

C2 47pF

T57 15 4 270pF 2nd ORDER ANTIALIASING FILTER

OSCIN 13

OSCOUT 14

MPX

5 OSCILLATOR & DIVIDER 9

OSEL FSEL

16 FILOUT 8 8th ORDER SC-BANDPASS FILTER 57KHz PLL 1187.5Hz PLL 7 1 VS 100nF VREF 10µF INTEGRAL BIPHASE DEC. 3 + POLARITY BIPHASE DEC. 0 1 2 12 QUAL DET.

RDCL

N.U. QUAL

MUX

DIFF. DECODER

RDDA

10 TEST LOGIC

TM

6 GND

11 EXTRES
D03AU1490

November 2004

Rev. 2 1/8

TDA7478
Table 2. Pin Description
No pin 1 2 3 4 5 Name QUAL RDDA VREF MPX OSEL RDS data output Reference voltage RDS input signal Oscillator selector pin: - open, closed to VS = quartz oscillator - closed to GND=external driven Ground Not Used (to be left open) Filter output Frequency selector pin: - open = 4.332MHz - closed to VS = 8.664MHz Test mode pin: - open = normal operation - closed to VS = testmode Reset pin: - open=run mode - closed to VS = reset condition Supply voltage Oscillator input Oscillator output Testing output pin: 57kHz clock output RDS clock output 1187.5Hz Description Output for signal quality indication (High = good)

6 7 8 9

GND N.U. FILOUT FSEL

10 11 12 13 14 15 16

TM EXTRES VS OSCIN OSCOUT T57 RDCL

Figure 3. Pin Connection (Top view)

QUAL RDDA VREF MPX OSEL GND N.U. FILOUT

1 2 3 4 5 6 7 8
D97AU752A

16 15 14 13 12 11 10 9

RDCL T57 OSCOUT OSCIN VS EXTRES TM FSEL

Table 3. Thermal Data
Symbol Rth j-case Description Th


























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