Details, datasheet, quote on part number: TDA7479ADTR
PartTDA7479ADTR
Category
DescriptionSingle Chip RDS Demodulator + Filter
CompanyST Microelectronics, Inc.
DatasheetDownload TDA7479ADTR datasheet
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Features, Applications

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

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

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.

16 FILOUT 8 8th ORDER SC-BANDPASS FILTER 57KHz PLL 1187.5Hz PLL VS 100nF VREF 10F INTEGRAL BIPHASE DEC. 3 + POLARITY BIPHASE DEC. FAST ARI INDICATOR QUAL DET.

No pin Name QUAL RDDA VREF MPX OSEL RDS data output Reference voltage RDS input signal Oscillator selector pin: - open, closed 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: 17.328MHz - open 4.332MHz - closed = 8.664MHz Test mode pin: - open = normal operation - closed VS = testmode Reset pin: - open=run mode - closed 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)

Symbol Rth j-case Description Thermal Resistance Junction-case Max. TSSOP16 160 Unit C/W

Symbol VS Top Tstg Supply Voltage Operating Temperature Range Storage Temperature Parameter Value to 150 Unit V C

ELECTRICAL CHARACTERISTCS (Tamb = 5V, unless otherwise specified)

Symbol VS IS FILTER G A Center frequency 3dB Bandwidth Gain Attenuation RI RL S/N VIN VREF Input impedance of MPX Load impedance on FILOUT Signal to noise ratio MPX input signal Reference VIN = 57kHz (RDS+ ARI) VS/2 kHz M dB mVRMS V Parameter Supply voltage Supply current Test Condition Min. 4.5 Typ. 5 7.5 Max. 5.5 11.0 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) = 0.5mA OSEL = open circuit OSEL = open circuit OSEL = open circuit OSEL = GND, = 4.332MHz OSEL = GND, = 8.664MHz OSEL = GND, = 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 = 5V (pull-down input) = 0V (pull-up input) VS A mVpp

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

 

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