E-TDA7479DTR - STMicroelectronics

November 2008 Rev 7 1/12

TDA7479

Single chip RDS demodulator + filter

Features

■Very high RDS demodulation quality with

improved digital signal processing

■High performance, 57 kHz 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

■4.332 MHz crystal oscillator

(8.664 and 17.328 MHz optional)

■Low noise CMOS technology

■Low radiation

Description

The TDA7479 recovers the additional inaudible

RDS information which is transmitted by FM radio

broadcasting 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 processed by a suitable

RDS decoder.

Outputs for RDS signal quality and ARI indication

are also present.

SO16

TSSOP16

Table 1. Device summary

Order code Package Packing

E-TDA7479D(1)

1. Device in ECOPACK® package (see Section 5: Package information on page 9).

SO16 Tube

E-TDA7479AD(1) TSSOP16 Tube

www.st.com

Contents TDA7479
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Contents
Block diagram and pin description  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
2 Pin description  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
Electrical specification  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1 Thermal data   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
Output timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Oscillator controls (FSEL, OSEL)   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Package information  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Revision history   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

TDA7479 Block diagram and pin description

3/12

1 Block diagram and pin description

1.1 Block diagram

Figure 1. Block diagram

1.2 Pin description

Figure 2. Pin connection (top view)

2nd ORDER

ANTIALIASING

FILTER

8th ORDER

SC-BANDPASS

FILTER

MPX 4

270pF

FILOUT

3VREF

100nF

10μF

OSCILLATOR &

DIVIDER

57KHz PLL

FAST ARI

INDICATOR

POLARITY

BIPHASE DEC.

INTEGRAL

BIPHASE DEC.

1187.5Hz

PLL

MUX

1DIFF. DECODER

TEST LOGIC

QUAL DET.

GND

EXTRES

1413

D97AU751A

RDDA

QUAL

ARI

RDCL

FSEL

OSEL

OSCOUTOSCIN

4.332MHz C2 47pFC1 27pF

T57

QUAL

RDDA

VREF

MPX

OSEL

ARI

GND

7TM

EXTRES

OSCIN

OSCOUT

T57

RDCL16

D97AU752

FILOUT 8 FSEL9

Block diagram and pin description TDA7479

4/12

Table 2. Pin description

No pin Name Description

1 QUAL Output for signal quality indication (High = good)

2 RDDA RDS data output

3 VREF Reference voltage

4 MPX RDS input signal

5 OSEL

Oscillator selector pin:

– open, closed to V

= quartz oscillator

– closed to GND = external driven

6 GND Ground

7ARI

Output for ARI indication:

– high when RDS+ARI are present

– high when only ARI is present

– low when only RDS is present

– undefined when nos signal is present

8 FILOUT Filter output

9 FSEL

Frequency selector pin:

– 100 kHz to V

= 17.328 MHz

– open = 4.332MHz

– closed to VS = 8.664 MHz

10 TM

Test mode pin:

– open = normal operation

– closed to VS = test mode

11 EXTRES

Reset pin:

– open = run mode

– -closed to VS = reset condition

12 V

Supply voltage

13 OSCIN Oscillator input

14 OSCOUT Oscillator output

15 T57 Testing output pin: 57 kHz clock output

16 RDCL RDS clock output 1187.5 Hz

TDA7479 Electrical specification

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2 Electrical specification

2.1 Thermal data

2.2 Absolute maximum ratings

2.3 Electrical characteristics

Table 3. Thermal data

Symbol Parameter SO16 TSSOP16 Unit

th j-case

Thermal resistance junction to case Max. 200 160 °C/W

Table 4. Absolute maximum ratings

Symbol Parameter Value Unit

Supply voltage -0.3 to 7 V

Operating temperature range -40 to 85 °C

stg

Storage temperature -55 to 150 °C

Table 5. Electrical characteristics

amb

= 25°C, V

= 5V, unless otherwise specified)

Symbol Parameter Test condition Min. Typ. Max. Unit

Supply voltage 4.5 5 5.5 V

Supply current 7.5 11.0 mA

Filter

Center frequency 56.5 57 57.5 kHz

BW 3dB Bandwidth 2.5 3 3.5 kHz

G Gain f = 57 kHz 18 20 22 dB

A Attenuation

Δf ± 4 kHz 18 22 dB

f = 38 kHz 50 60 dB

f = 67 kHz 35 45 dB

Input impedance of MPX 80 120 150 KΩ

Load impedance on FILOUT 1 MΩ

S/N Signal to noise ratio V

= 3 mVrms 30 40 dB

MPX input signal f = 19 kHz; T3 ≤ 40 dB(1)

f = 57 kHz (RDS+ ARI)

1000

RMS

RDS

RDS detection sensitivity 1 mVrms

ARI

ARI Detection Sensitivity 3 mVrms

Electrical specification TDA7479

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REF

Reference V

/2 V

Demodulator

Input pins (EXTRES, FSEL, TM:) all with internal pull down resistor

Input pin (OSEL): with internal pull up resistor

Input current V

= 5 V (pull-down input) 15 30 μA

Input current V

= 0 V (pull-up input) -25 -10 μA

Input voltage high

0.7 · V

0.8 · V

VIL Input voltage low

0.2 · V

0.3 · V

Output pins (RDCL, RDDA, ARI, QUAL, T57)

Output voltage high I

= 0.5mA 4 4.6 V

Output voltage low I

= 0.5mA 0.4 1 V

Oscillator

CLL

Input level OSCIN pin OSEL = open circuit 1 V

VCLH

Input level OSCIN pin OSEL = open circuit 4 V

Amplitude OSCOUT OSEL = open circuit 4.5 V

Amplitude OSCIN

(for external drive)

OSEL = GND, f = 4.332 MHz

OSEL = GND, f = 8.664 MHz

100

120

mVpp

OSEL = GND, f = 17.328 MHz 150 mVpp

1. The 3rd harmonic (57 kHz) must be less than -40 dB with respect to the input signal plus gain.

Table 5. Electrical characteristics (continued)

amb

= 25°C, V

= 5V, unless otherwise specified)

Symbol Parameter Test condition Min. Typ. Max. Unit

TDA7479 Output timing

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3 Output timing

The RDS (1187.5Hz) output clock on RDCL line is synchronized to the incoming data. According

to the internal PLL lock condition data change can result on the falling or on the rising clock edge

(see Figure 3). Whichever clock edge is used by the decoder (rising or falling edge) the data will

remain valid for 416.7

s after the clock transition.

Figure 3. RDS timing diagram

RDCL

RDDA

CLOCK

LINE

DATA

LINE

4.3µs

4.3µs837.7µs 421µs 421µs

Oscillator controls (FSEL, OSEL) TDA7479

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4 Oscillator controls (FSEL, OSEL)

Three different crystal frequencies can be used. The adoption of the internal clock divider to

the external crystal is achieved via the input pin FSEL. See the following table for reference:

A special mode is introduced to reduce EMI. With pin OSEL connected to GND the internal

oscillator is switched off and an external sinusoidal frequency could be applied on OSCIN.

The peak to peak voltage of this signal can be reduced down to 60mV.

In this mode the frequency selection via FSEL is still active.

Suggested values of C1 and C2 are shown in the following table:

Table 6. Crystal frequencies

Crystal FSEL (pin configuration)

4.332MHz

8.664MHz

17.328MHz

connected to GND or open connected to Vs external resistor of 100K to Vs

Table 7. C1 and C2 value

Crystal C1 C2

4.332MHz

8.664MHz

17.328MHz

27pF

47pF

TDA7479 Package information

9/12

5 Package information

In order to meet environmental requirements, ST (also) offers these devices in ECOPACK®

packages. ECOPACK® packages are lead-free. The category of second Level Interconnect

is marked on the package and on the inner box label, in compliance with JEDEC Standard

JESD97. The maximum ratings related to soldering conditions are also marked on the inner

box label.

ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.

Figure 4. SO16 mechanical data and package dimensions

OUTLINE AND

MECHANICAL DATA

DIM.

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

A 2.35 2.65 0.093 0.104

A1 0.10 0.30 0.004 0.012

B 0.33 0.51 0.013 0.200

C 0.23 0.32 0.009 0.013

D (1) 10.10 10.50 0.398 0.413

E 7.40 7.60 0.291 0.299

e 1.27 0.050

H 10.0 10.65 0.394 0.419

h 0.25 0.75 0.010 0.030

L 0.40 1.27 0.016 0.050

k 0˚ (min.), 8˚ (max.)

ddd 0.10 0.004

(1) “D” dimension does not include mold flash, protusions or gate

burrs. Mold flash, protusions or gate burrs shall not exceed

0.15mm per side.

SO16 (Wide)

0016021 C

Package information TDA7479

10/12

Figure 5. TSSOP16 mechanical data and package dimensions

OUTLINE AND

MECHANICAL DATA

DIM.

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

A 1.200 0.047

A1 0.050 0.150 0.002 0.006

A2 0.800 1.000 1.050 0.031 0.039 0.041

b 0.190 0.300 0.007 0.012

c 0.090 0.200 0.005 0.009

D (1) 4.900 5.000 5.100 0.114 0.118 0.122

E 6.200 6.400 6.600 0.244 0.252 0.260

E1 (1) 4.300 4.400 4.500 0.170 0.173 0.177

e 0.650 0.026

L 0.450 0.600 0.750 0.018 0.024 0.030

L1 1.000 0.039

k 0˚ (min.) 8˚ (max.)

aaa 0.100 0.004

Note: 1. D and E1 does not include mold flash or protrusions.

Mold flash or potrusions shall not exceed 0.15mm

(.006inch) per side.

TSSOP16

0080338 (Jedec MO-153-AB)

(Body 4.4mm)

TDA7479 Revision history

11/12

6 Revision history

Table 8. Document revision history

Date Revision Changes

10-Sep-2004 4 Initial release.

20-Nov-2004 5 Add in Table 5: Electrical characteristics on page 5 the “RDS and

ARI Detection Sensitivity” parameters.

02-Dec-2004 6 Modified the order codes table.

04-Nov-2008 7

Document reformatted.

Updated Table 1: Device summary on page 1.

Updated Section 5: Package information on page 9.

TDA7479

12/12

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