TDA7479_04 Datasheet, PDF (1/8 Pages) STMicroelectronics – SINGLE CHIP RDS DEMODULATOR + FILTER

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
2 DESCRIPTION
The TDA7479 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
Figure 1. Packages
SO16
Table 1. Order Codes
Part Number
TDA7479D
TDA7479AD
TSSOP16
Package
SO16
TSSOP16
EBU (European Broadcasting Union) specifications.
The device is made up of two sections: a cascaded
antialiasing + switched capacitors 8^th 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.
Outputs for RDS signal quality and ARI indication are
also present.
C1 27pF 4.332MHz C2 47pF
4
MPX
270pF
8
FILOUT
V_S
100nF
10µF
12
VREF 3
2nd ORDER
ANTIALIASING
FILTER
8th ORDER
SC-BANDPASS
FILTER
-
+
T57
15
OSCIN
13
OSCOUT
14
OSCILLATOR &
DIVIDER
57KHz PLL
FAST ARI
INDICATOR
1187.5Hz
PLL
QUAL DET.
5
OSEL
9
FSEL
16
RDCL
7
ARI
1
QUAL
POLARITY
BIPHASE DEC.
INTEGRAL
BIPHASE DEC.
0
MUX
1
DIFF. DECODER
2
RDDA
TEST LOGIC
10
TM
6
GND
December 2004
11
EXTRES
D97AU751A
Rev. 6
1/8