E-TDA7478DTR STMicroelectronics, E-TDA7478DTR Datasheet

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E-TDA7478DTR

Manufacturer Part Number
E-TDA7478DTR
Description
IC DEMODULATOR SGL RDS 16-SOIC
Manufacturer
STMicroelectronics
Datasheet

Specifications of E-TDA7478DTR

Function
Demodulator, Filter
Gain
20dB
Current - Supply
7.5mA
Voltage - Supply
4.5 V ~ 5.5 V
Package / Case
16-SOIC (0.300", 7.50mm Width)
Pin Count
16
Screening Level
Industrial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Noise Figure
-
P1db
-
Lo Frequency
-
Rf Frequency
-
Lead Free Status / Rohs Status
Compliant
1
2
The TDA7478 recovers the additional inaudible RDS
information which is transmitted by FM radio broad-
casting stations and operates in accordance with the
Figure 2. Block Diagram
November 2004
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
MPX
FEATURES
DESCRIPTION
100nF
V
10µF
S
270pF
FILOUT
VREF
4
8
12
3
GND
6
ANTIALIASING
+
-
2nd ORDER
SC-BANDPASS
FILTER
8th ORDER
FILTER
SINGLE CHIP RDS DEMODULATOR
15
T57
BIPHASE DEC.
BIPHASE DEC.
EBU (European Broadcasting Union) specifications.
The device is made up of two sections: a cascaded
antialiasing + switched capacitors 8
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.
Figure 1. Packages
Table 1. Order Codes
57KHz PLL
POLARITY
INTEGRAL
C1 27pF
OSCIN
E-TDA7478AD
Part Number
OSCILLATOR &
TDA7478D
4.332MHz
DIVIDER
13
SO16
0
1
C2 47pF
OSCOUT
14
MUX
EXTRES
QUAL DET.
11
1187.5Hz
DIFF. DECODER
PLL
TEST LOGIC
TDA7478
TSSOP16
TSSOP16
Package
th
D03AU1490
SO16
bandpass filter
16
10
5
9
7
1
2
OSEL
FSEL
RDCL
N.U.
QUAL
RDDA
TM
Rev. 2
1/8

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E-TDA7478DTR Summary of contents

Page 1

... SINGLE CHIP RDS DEMODULATOR Figure 1. Packages Table 1. Order Codes EBU (European Broadcasting Union) specifications. The device is made up of two sections: a cascaded antialiasing + switched capacitors 8 for precise RDS band selection and a demodulating section that performs the extraction od RDS data stream (RDDA) and clock (RDCL further pro- cessed by a suitable RDS decoder ...

Page 2

... N.U. Not Used (to be left open) 8 FILOUT Filter output 9 FSEL Frequency selector pin: - open = 4.332MHz - closed 8.664MHz 10 TM Test mode pin: - open = normal operation - closed testmode 11 EXTRES Reset pin: - open=run mode - closed reset condition 12 V Supply voltage S 13 OSCIN Oscillator input 14 ...

Page 3

... Input level OSCIN pin VCLH Input level OSCIN pin Amplitude OSCOUT V Amplitude OSCIN PP (for external drive) (1) The 3rd harmonic (57kHz) must be less than -40dB with respect to the input signal plus gain. Parameter Test Condition f = 57kHz ∆f ± 4kHz f = 38kHz f = 67kHz V = 3mVRMS ...

Page 4

... 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 µs after the clock transi- tion. ...

Page 5

... L 0.40 1.27 k 0˚ (min.), 8˚ (max.) ddd 0.10 (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. inch MIN. TYP. MAX. 0.093 0.104 0.004 0.012 ...

Page 6

... L 0.450 0.600 0.750 L1 1.000 k 0˚ (min.) 8˚ (max.) aaa 0.100 Note and E1 does not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch) per side. 6/8 inch MIN. TYP. MAX. 0.047 0.002 0.006 0.031 0.039 ...

Page 7

... Table 8. Revision History Date Revision July 2004 November 2004 1 First Issue 2 Add in the table 5 “RDS and ARI Detection Sensitivity” parameters. Description of Changes TDA7478 7/8 ...

Page 8

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