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| TDA7479 SINGLE CHIP RDS DEMODULATOR + FILTER 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 Figure 1. Packages SO16 TSSOP16 Table 1. Order Codes Part Number TDA7479D TDA7479AD 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. Outputs for RDS signal quality and ARI indication are also present. 2 DESCRIPTION The TDA7479 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 10F INTEGRAL BIPHASE DEC. 3 + POLARITY BIPHASE DEC. 0 1 2 12 FAST ARI INDICATOR QUAL DET. RDCL ARI QUAL MUX DIFF. DECODER RDDA 10 TEST LOGIC TM 6 GND 11 EXTRES D97AU751A December 2004 Rev. 6 1/8 TDA7479 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 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 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 GND ARI 8 9 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 ARI FILOUT 1 2 3 4 5 6 7 8 D97AU752 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 Thermal Resistance Junction-case Max. SO16 200 TSSOP16 160 Unit C/W 2/8 TDA7479 Table 4. Absolute Maximum Ratings Symbol VS Top Tstg Supply Voltage Operating Temperature Range Storage Temperature Parameter Value -0.3 to 7 -40 to 85 -55 to 150 Unit V C C Table 5. Electrical Characteristcs (Tamb = 25C, VS = 5V, unless otherwise specified) Symbol VS IS FILTER fC BW G A Center frequency 3dB Bandwidth Gain Attenuation f = 57kHz f 4kHz f = 38kHz f = 67kHz RI RL S/N VIN SRDS SARI VREF Input impedance of MPX Load impedance on FILOUT Signal to noise ratio MPX input signal RDS Detection Sensitivity ARI Detection Sensitivity Reference VIN = 3mVRMS f = 19kHz; T3 40dB f = 57kHz (RDS+ ARI) (1) Parameter Supply voltage Supply current Test Condition Min. 4.5 Typ. 5 7.5 Max. 5.5 11.0 57.5 3.5 22 Unit V mA kHz kHz dB dB dB dB 56.5 2.5 18 18 50 35 80 1 30 57 3 20 22 60 45 120 40 150 K M dB 1000 50 1 3 VS/2 mVRMS mVRMS mVrms mVrms V DEMODULATOR Input pins (EXTRES, FSEL, TM) Input pin (OSEL) IPD IPU VIH VIL VOH VOL VCLL VCLH VPP Input Current Input Current Input voltage high Input voltage low Ouput voltage high Output voltage low Input level OSCIN pin Input level OSCIN pin Amplitude OSCOUT Amplitude OSCIN (for external drive) IL = 0.5mA IL = 0.5mA OSEL = open circuit OSEL = open circuit OSEL = open circuit OSEL = GND, f = 4.332MHz OSEL = GND, f = 8.664MHz OSEL = GND, f = 17.328MHz (1) The 3rd harmonic (57kHz) must be less than -40dB with respect to the input signal plus gain. all with internal pull down resistor with internal pull up resistor VIN = 5V (pull-down input) VIN = 0V (pull-up input) 15 -25 0.7 * VS 0.8 * VS 0.2 * VS 0.3 * VS 4 4.6 0.4 1 1 4 4.5 100 120 150 30 -10 A A V V V V V V V mVpp mVpp mVpp Output pins (RDCL, RDDA, ARI, QUAL, T57) OSCILLATOR 3/8 TDA7479 Figure 4. RDS timing diagram CLOCK LINE DATA LINE 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 Fig. 4)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. 4 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: Table 6. Crystal 4.332MHz 8.664MHz 17.328MHz FSEL (pin configuration) connected to GND or openconnected 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: Table 7. Crystal 4.332MHz 8.664MHz 17.328MHz C1 27pF 27pF 27pF C2 47pF - 4/8 TDA7479 Figure 5. SO16 Mechanical Data & Package Dimensions mm DIM. MIN. A A1 B C D (1) E e H h L k ddd 10.0 0.25 0.40 2.35 0.10 0.33 0.23 10.10 7.40 1.27 10.65 0.75 1.27 0.394 0.010 0.016 TYP. MAX. 2.65 0.30 0.51 0.32 10.50 7.60 MIN. 0.093 0.004 0.013 0.009 0.398 0.291 0.050 0.419 0.030 0.050 TYP. MAX. 0.104 0.012 0.200 0.013 0.413 0.299 inch OUTLINE AND MECHANICAL DATA 0 (min.), 8 (max.) 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 5/8 TDA7479 Figure 6. TSSOP16 Mechanical Data & Package Dimensions mm DIM. MIN. A A1 A2 b c D (1) E 0.050 0.800 0.190 0.090 4.900 6.200 5.000 6.400 4.400 0.650 0.450 0.600 1.000 0 (min.) 8 (max.) 0.100 0.004 0.750 0.018 1.000 TYP. MAX. 1.200 0.150 1.050 0.300 0.200 5.100 6.600 4.500 0.002 0.031 0.007 0.005 0.114 0.244 0.170 0.118 0.252 0.173 0.026 0.024 0.039 0.030 0.039 MIN. TYP. MAX. 0.047 0.006 0.041 0.012 0.009 0.122 0.260 0.177 inch OUTLINE AND MECHANICAL DATA E1 (1) 4.300 e L L1 k aaa 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 (Body 4.4mm) 0080338 (Jedec MO-153-AB) 6/8 TDA7479 Table 8. Revision History Date September 2004 November 2004 2 December 2004 Revision 4 5 6 Description of Changes First Issue in EDOCS dms. Add in the table 5 "RDS and ARI Detection Sensitivity" parameters. Errata corrige of the Order Codes table. 7/8 TDA7479 Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners (c) 2004 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 8/8 |
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