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TDA7331DTRSTN/a605avaiSINGLE CHIP RDS DEMODULATOR + FILTER


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TDA7331DTR
SINGLE CHIP RDS DEMODULATOR + FILTER
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TDA7331
SINGLE CHIP RDS DEMODULATOR + FILTER
I. VERY HIGH RDS DEMODULATION QUALITY
WITH IMPROVED DIGITAL SIGNAL PROC-
ESSING
II HIGH PERFORMANCE, 57KHz BANDPASS
FILTER (8th ORDER)
II PURELY DIGITAL RDS DEMODULATION
WITHOUT EXTERNAL COMPONENTS
I. ARI INDICATION AND RDS SIGNAL QUAL-
ITY OUTPUTS
II 4.332MHz CRYSTAL OSCILLATOR
(8.664 and 17.328MHz SELECTABLE OP-
TIONS)
II LOW NOISE CMOS TECHNOLOGY
II LOWRADIATION
DESCRIPTION
The TDA7331, an improved version of
TDA7330B, recovers the additional inaudible
RDS information which is transmitted by FM radio
broadcasting stations and operates in accord-
ance with the EBU (European Broadcasting Un-
ion) specifications.
The device is made up of two sections: a cas-
BLOCK DIAGRAM and TEST CIRCUIT
ssc::,:,:,;,;;,;;:;:::):,)',),
ORDERING NUMBERS:
TDA7331 TDA7331 D
caded antialiasing + switched capacitors band-
pass filter for precise RDS band selection and a
demodulating section that performs the extraction
od RDS data stream (RDDA) and clock (RDCL),
to be furher processed by a suitable RDS de-
coder.
Outputs for RDS signal quality and ARI indication
are also present.
C127pF 4.332MHZ C247pF
T57 OSCIN OSCOUT
, I 10 9
I 1 , uHl--i=1--0cu
MPX y-l I
A, 2nd ORDER \ , 3
ANTIALIASING I
FILTER I OSCILLATOR &
: DIVIDER 18 FSEL
[1 I , I I2
I A = - RDCL
4 8th ORDER I - 57KHz PLL 1187.5Hz
FILOUT =."d SC-BANDPASS c-a' . > PLL 15
FILTER I
I f I ARI
I -- - 14 OUAL
FAST ARI
16 I QUAL DET.
V l-a I INDICATOR =
1080 F I J"
POLARITY
VREF 2 I r = 0 13
: BIPHASE DEC. 1 MUX - DIFF. DECODER - RDDA
10IIF , ,
( INTEGRAL - 19 TM
I - BIPHASE DEC. TEST LOGIC
5 I 518,17 20
GND N.C. EXTREs D97AU686B
September 2003 1/7
TDA7331
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
Vs Supply Voltage 7 V
Ta, Operating Temperature Range MO to 85 (
Tstg Storage Temperature -55 to 150 (
PIN FUNCTION
No pin Name Functional description
1 MPX RDS input signal
2 VREF Reference voltage
3 OSEL Oscillator selector pin: - open, or closed to Vs = quartz oscillator
- closed to GND = external driven
4 FILOUT Filter output
5 GND Ground
6 no Not connected
7 no Not connected
8 no Not connected
9 OSCOUT Oscillator output
10 OSCIN Oscillator input
11 T57 Testing output pin: 57kHz clock output
12 RDCL RDS clock output 1187.5Hz
13 RDDA RDS data output
14 QUAL Output for signal quality indication (High = good)
15 ARI 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 siqnal is present
16 Vs Supply voltage
17 no Not connected
18 FSEL Frequency selector pin: - 100K to Vs = 17.328MHz
- open = 4.332MHz
- closed to Vs = 8.664MHz
19 TM Test mode pin: - open = normal operation
- closed to Vs = testmode
20 EXTRES Reset pin: - open = run mode
- closed to Vs = reset condition
PIN CONNECTION
MPX E 1 20 Cl EXTRES
VREF E 2 19 Cl TM
OSEL E 3 18 Cl FSEL
FILOUT E 4 17 Cl N.C.
GND E 5 16 Cl VS
N.C. E 6 15 Cl ARI
N.C. E 7 14 Cl QUAL
N.C. E 8 13 Cl RDDA
OSCOUT E 9 12 Cl RDCL
OSCIN E 10 11 Cl T57
D97AU687
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