TDA7479 SINGLE CHIP RDS DEMODULATOR + FILTER 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 DIP16 SO16 ORDERING NUMBERS: TDA7479 TDA7479D The device is made up of two sections: a cascaded antialiasing + switched capacitors 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 furher processed by a suitable RDS decoder. Outputs for RDS signal quality and ARI indication are also present. 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. BLOCK DIAGRAM AND TEST CIRCUIT C1 27pF T57 4.332MHz OSCIN OSCOUT 13 15 C2 47pF 14 4 MPX 2nd ORDER ANTIALIASING FILTER 270pF 5 OSCILLATOR & DIVIDER 9 16 FILOUT 8th ORDER SC-BANDPASS FILTER 8 1187.5Hz PLL 57KHz PLL 7 1 FAST ARI INDICATOR 12 VS QUAL DET. OSEL FSEL RDCL ARI QUAL 100nF VREF - 3 + POLARITY BIPHASE DEC. 0 MUX DIFF. DECODER 10 INTEGRAL BIPHASE DEC. 6 GND February 1998 2 RDDA 1 10µF TEST LOGIC TM 11 EXTRES D97AU751A 1/7 TDA7479 ABSOLUTE MAXIMUM RATINGS Symbol VS Top Tstg Parameter Supply Voltage Operating Temperature Range Storage Temperature Value -0.3 to 7 -40 to 85 -55 to 150 Unit V °C °C THERMAL DATA Symbol Rth j-case Description Thermal Resistance Junction-case Max. DIP16 100 PIN DESCRIPTION N o pin 1 2 3 4 5 Name QUAL RDDA VREF MPX OSEL 6 7 GND ARI 8 9 FILOUT FSEL 10 TM 11 EXTRES 12 13 14 15 16 VS OSCIN OSCOUT T57 RDCL Description Output for signal quality indication (High = good) RDS data output Reference voltage RDS input signal Oscillator selector pin: - open, closed to VS = quartz oscillator - closed to GND=external driven Ground 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 Filter output Frequency selector pin: -100K to VS = 17.328MHz - open = 4.332MHz - closed to V S = 8.664MHz Test mode pin: - open = normal operation - closed to V S = testmode Reset pin: - open=run mode - closed to V S = reset condition Supply voltage Oscillator input Oscillator output Testing output pin: 57kHz clock output RDS clock output 1187.5Hz PIN CONNECTION (Top View) QUAL 1 16 RDCL RDDA 2 15 T57 VREF 3 14 OSCOUT MPX 4 13 OSCIN OSEL 5 12 VS GND 6 11 EXTRES ARI 7 10 TM FILOUT 8 9 D97AU752 2/7 FSEL SO16 200 Unit °C/W TDA7479 THERMAL DATA Symbol Description Rth j-amb Thermal Resistance Junction-Ambient Max DIP20 SO20 Unit 100 200 °C/W ELECTRICAL CHARACTERISTICS (Tamb = 25°C, VS = 5V, unless otherwise specified). Symbol Parameter VS Supply voltage IS Supply current Test Condition Min. 4.5 Typ. Max. Unit 5 5.5 V 7.5 11.0 mA FILTER fC BW Center frequency 56.5 57 57.5 kHz 3dB Bandwidth 2.5 3 3.5 kHz 22 G Gain f = 57kHz 18 20 A Attenuation ∆f ± 4kHz f = 38kHz 18 22 dB 50 60 dB f = 67kHz 35 45 120 RI Input impedance of MPX 80 RL Load impedance on FILOUT 1 S/N Signal to noise ratio VIN = 3mVRMS VIN MPX input signal f = 19kHz; T3 ≤ 40dB(1) f = 57kHz (RDS+ ARI) VREF 30 dB 150 KΩ MΩ 40 dB 1000 50 Reference dB VS/2 mVRMS mVRMS V DEMODULATOR Input pins (EXTRES, FSEL, TM) Input pin (OSEL) all with internal pull down resistor with internal pull up resistor IPD Input Current VIN = 5V (pull-down input) 15 30 µA IPU Input Current VIN = 0V (pull-up input) -25 -10 VIH Input voltage high µA V V IL Input voltage low 0.7 ⋅ VS 0.8 ⋅ VS 0.2 ⋅ VS 0.3 ⋅ VS V Output pins (RDCL, RDDA, ARI, QUAL, T57) VOH Ouput voltage high IL = 0.5mA V OL Output voltage low IL = 0.5mA 4 4.6 0.4 V 1 V OSCILLATOR VCLL Input level OSCIN pin OSEL = open circuit VCLH Input level OSCIN pin OSEL = open circuit V PP 1 4 V V Amplitude OSCOUT OSEL = open circuit 4.5 V Amplitude OSCIN (for external drive) OSEL = GND, f = 4.332MHz 100 mVpp OSEL = GND, f = 8.664MHz 120 mVpp OSEL = GND, f = 17.328MHz 150 mVpp (1) The 3rd harmonic (57kHz) must be less than -40dB with respect to the input signal plus gain. 3/7 TDA7479 Figure 1. RDS timing diagram CLOCK LINE DATA LINE 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 Fig. 1) Whichever clock edge is used by the decoder (rising or falling edge) the data will remain valid for 416.7 µsec after the clock transition. OSCILLATOR CONTROLS (FSEL, OSEL) Three different crystal frequencies can be used. The adaption of the internal clock divider to the external crystal is achieved via the input pin FSEL. See the following table for reference: 4/7 Crystal FSEL (pin configuration) 4.332MHz 8.664MHz 17.328MHz connected to GND or open connected to Vs external resistor of 100K to Vs 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: Crystal C1 C2 4.332MHz 8.664MHz 17.328MHz 27pF 27pF 27pF 47pF - TDA7479 DIP16 PACKAGE MECHANICAL DATA mm DIM. MIN. a1 0.51 B 0.77 TYP. inch MAX. MIN. TYP. MAX. 0.020 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 E 8.5 0.335 e 2.54 0.100 e3 17.78 0.700 F 7.1 0.280 I 5.1 0.201 L Z 3.3 0.130 1.27 0.050 5/7 TDA7479 SO16 PACKAGE MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. TYP. 2.65 0.1 MAX. 0.104 0.3 a2 0.004 0.012 2.45 0.096 b 0.35 0.49 0.014 0.019 b1 0.23 0.32 0.009 0.013 C 0.5 0.020 c1 45° (typ.) D 10.1 10.5 0.398 0.413 E 10.0 10.65 0.394 0.419 e 1.27 0.050 e3 8.89 0.350 F 7.4 7.6 0.291 0.299 L 0.5 1.27 0.020 0.050 M S 6/7 MIN. 0.75 0.030 8° (max.) TDA7479 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. 1998 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 7/7