TDA7478D ,SINGLE CHIP RDS DEMODULATORFEATURESFigure 1. Packages■ VERY HIGH RDS DEMODULATION QUALITY WITH IMPROVED DIGITAL SIGNAL PROCESS ..
TDA7478DTR ,SINGLE CHIP RDS DEMODULATORTDA7478SINGLE CHIP RDS DEMODULATOR1
TDA7479 ,SINGLE CHIP RDS DEMODULATOR + FILTERBlock DiagramC1 27pF 4.332MHz C2 47pFT57 OSCIN OSCOUT15 13 144MPX2nd ORDER270pF 5ANTIALIASINGOSELOS ..
TDA7479AD ,SINGLE CHIP RDS DEMODULATOR + FILTERABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Supply Voltage -0.3 to 7 VST Operating Tempera ..
TDA7479ADTR ,SINGLE CHIP RDS DEMODULATOR + FILTERFEATURESFigure 1. Packages■ VERY HIGH RDS DEMODULATION QUALITY WITH IMPROVED DIGITAL SIGNAL PROCESS ..
TDA7479D ,SINGLE CHIP RDS DEMODULATOR + FILTERTDA7479SINGLE CHIP RDS DEMODULATOR + FILTER■ VERY HIGH RDS DEMODULATION QUALITY WITH IMPROVED DIGIT ..
THS3095DG4 ,Single- High-Voltage, Low Distortion, Current-Feedback Operational Amplifier with Power-down 8-SOIC -40 to 85Maximum Ratings.. 410.2 Layout Example ...... 386.2 ESD Ratings........ 410.3 PowerPAD Design Consi ..
THS3096 ,Dual- High-Voltage, Low Distortion, Current-Feedback Operational Amplifier with Power-downmaximum ratings under any condition is limited by the constraints of the silicon process. Stresses ..
THS3096D ,Dual- High-Voltage, Low Distortion, Current-Feedback Operational Amplifier with Power-downfeatures a power-down pin (PD) that– 2 nV/√Hz Voltage Noise puts the amplifier in low power standby ..
THS3096PWP ,Dual- High-Voltage, Low Distortion, Current-Feedback Operational Amplifier with Power-downSLOS428B–DECEMBER 2003–REVISED FEBRUARY 2006These devices have limited built-in ESD protection. The ..
THS3110IDGN ,Single, Low Noise, High Voltage Current-Feedback Amplifier with Power-downfeatures a power-down pin (PD) that• High Output Current Drive: 260 mAputs the amplifier in low-pow ..
THS3110IDRG4 ,Single, Low Noise, High Voltage Current-Feedback Amplifier with Power-down 8-SOIC -40 to 85This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated cir ..
TDA7478-TDA7478D-TDA7478DTR
SINGLE CHIP RDS DEMODULATOR
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TDA7478November 2004
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
DESCRIPTIONThe TDA7478 recovers the additional inaudible RDS
information which is transmitted by FM radio broad-
casting 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 pro-
cessed by a suitable RDS decoder.
Output for RDS signal quality is also present.
SINGLE CHIP RDS DEMODULATOR
Figure 2. Block DiagramRev. 2
TDA7478
Table 2. Pin Description
Figure 3. Pin Connection (Top view)
Table 3. Thermal Data
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TDA7478
Table 4. Absolute Maximum Ratings(1) The 3rd harmonic (57kHz) must be less than -40dB with respect to the input signal plus gain.
Table 5. Electrical Characteristcs (Tamb = 25°C, VS = 5V, unless otherwise specified)
TDA7478
Figure 4. RDS timing diagram OUTPUT TIMINGThe 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 µs after the clock transi-
tion.
OSCILLATOR CONTROLS (FSEL, OSEL)Two 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. 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.
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TDA7478
Figure 5. SO16 Mechanical Data & Package Dimensions
TDA7478
Figure 6. TSSOP16 Mechanical Data & Package Dimensions
