Maker : STMicroelectronics
Part No. : E-TDA7478AD

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Product Information

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 Thermal Resistance Junction-case Max. Value 200 Unit °C/W 2/8 TDA7478 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 = 25°C, 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(1) f = 57kHz (RDS) 1 3 VS/2 1 30 40 1000 50 56.6 2.5 17 57 3 20 22 60 45 120 57.4 3.5 23 kHz kHz dB dB dB dB KΩ MΩ dB mVRMS mVRMS mVrms mVrms V Parameter Supply voltage Supply current Test Condition Min. 4.5 Typ. 5 7.5 Max. 5.5 12.0 Unit V mA 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 4 4.5 100 120 4 VIN = 5V (pull-down input) VIN = 0V (pull-up input) all with internal pull down resistor with internal pull up resistor 15 -25 0.7 · ...

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