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TDA7331D
SINGLE CHIP RDS DEMODULATOR + FILTER
gerTfir,' SiGSrajM0)UilSOl1ll
[iij%tl(ijel,E(5Til(i))Nj(%) TDA7331
SINGLE CHIP RDS DEMODULATOR + FILTER
ssc::,:,:,;,;;,;;:;:::):,)',),
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
ORDERING NUMBERS:
TDA7331 TDA7331 D
DESCRIPTION . . . . .
The TDA7331 an improve d version of caded ilntiyiasing. + switched capaCIths band-
TDA7330B, reeovers the additional inaudible pass filter for preclse RDS band selection and a
demodulating section that performs the extraction
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
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
February 1998 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
