SGS Thomson Microelectronics TDA7338D, TDA7338 Datasheet
INTEGRATED 19KHz SC NOTCH FILTER
FOR PILOTCANCELLATION
ON CHIP FILTER FOR PILOT DETECTOR
AND PLL
ADJUSTMENT FREE VOLTAGE CONTROLLED OSCILLATOR
AUTOMATIC PILOT DEPENDENT MONO/
STEREOSWITCHING
NOISE BLANKING WITH PROGRAMMABLE
THRESHOLD
HIGHCUTCONTROL AND STEREO BLEND
INTEGRATED HIGH PASS FILTER FOR IN-
TERFERENCE DETECTOR
LEVEL INPUT FOR ADDITIONAL SPIKE DE-
TECTIONON FIELDSTRENGHTSIGNAL
VERY HIGH SUPPRESSION OF HARMONIC
AND INTERFERENCE SIGNALS
STEREO DECODER
ORDERING NUMBER:
TDA7338
SO20
DIP20
TDA7338(DIP20)
TDA7338D(SO20)
DESCRIPTION
The TDA7338 is a newconcept of monolithicintegrated stereodecoder with noise blanking for FM
car radio applications.
With the used BICMOS technique, the 19KHz
Notch Filter, the PLL Filter and Phase Filter is re-
PIN CONNECTION(Top view)
alized on the chip with a Switched Capacitor concept.
Avoiding the use of multipliers and non linear circuits a very high performance in terms of noise
suppression and total harmonic distortion is
reached.
December 1996
1/11
TDA7338
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
CC
I
CC
T
stg
T
amb
THERMAL DATA
Symbol Description DIP 20 SO 20 Unit
R
thj-pins
ESD
All pins are protectedagainst ESD according to the MIL883 standard.
BLOCK DIAGRAM AND TEST CIRCUIT
DC Supply Voltage 10.5 V
Supply Current 20 mA
Storage temperature -55 to 150
Operating ambient temperature -40 to 85 °C
Thermal resistance junction-pins Typ 100 200
°
C/W
°
C
MPX IN
70K
DETECTOR
1µF
40.2K
20 19 18 17 16 15 14 13
AMP
80KHz
LPF
PLL
SC
PHASE
&
PHASE
FILTER
CSB456F11
MPX
PILOT
IND.
MONO
PILOT
DETECTOR
DEMODULATOR
DIVIDERS
VCO
2617835
VCO
VR VSB VHCC
LEVEL
CONTROL
25KHz
LPF
AMP
140KHz
LPF
120KHz
LPF
LEVEL PROG GND V
NOISE
19KHz
SC NOTCH
PEAK
DETECTOR
TRIGGER
THRESHOLD
VCO OFF MUTE
BLANKER
PULSE
FORMER
TBLANK PEAK
1nF 1nF
HCRHCL
HIGH
CUT
CONTROL
47nF470pF
20K
20K
REFERENCE
AMP
AMP
S
D95AU364C
IN R
12
40.2K
11
OUT R
OUT L
10
40.2K
9
IN L
CREF
4
4.7µF
2/11
TDA7338
ELECTRICALCHARACTERISTICS (VCC= 9V;modulation frequency:1KHz;de-emphasistime:
T=50µs; nominal MPX input voltage: V
=40.2kΩ,R
R
IN
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
CC
I
CC
V
IN
V
ORMS
SVRR Supply VoltageRipple Rejection V
V
L/VR
V
o/Vi
R
O
V
O
α Channel Separation V
THD Total Harmonic distortion 0.02 0.3 %
S+N
N
α
M
V
DC
= 40.2kΩ;T
OUT
=27°C; C
amb
Supply Voltage 7.5 9 10.2 V
Supply Current 5 10 15 mA
MPX Input Level (peak to peak) fm= 1KHz 1.5 V
A.F. Output Voltage (mono) pin 10 and 11VIN= 0.5V
DifferenceofOutputVoltageLevels pin 10 and 11- mono -0.8 0.8 dB
Gain V10/V
Output Resistance pin 10 and 11 10 50
DC Output Voltage pin 10 and 11 4.2 4.5 4.8 V
Signal plus noise to noise ratio f= 20Hz to 16KHz;
Muting Attenuation V7and V8< 0.6V 100 dB
Mute DC Steps at pins 10, 11 Mute at pin 8 0 4 mV
CARRIER ANDHARMONIC SUPPRESSIONAT THEOUTPUT
= 1.5VPP; m 100%(75KHz deviation,f
MPX
=4.7µF; unless otherwisespecified)
REF
RMS
MONO;
= 200mV; f = 1KHz 40 55 dB
RIPPLE
20
= -50mV
R-VSB
DC
S = 2Vrms
=1KHz);
mod
1.5 V
8.5 9.5 10.5 dB
30 45 dB
91 dB
Ω
α19 Pilot Signal f = 19KHz 55 70 dB
38 Subcarrier f = 38KHz 75 dB
α
57 Subcarrier f = 57KHz 62 dB
α
α76 Subcarrier f = 76KHz 90 dB
INTERMODULATION(note 1)
2f
α
α3f
= 10KHz; f
mod
= 13KHz; f
mod
= 1KHz 65 dB
spur
= 1KHz 75 dB
spur
TRAFFICRADIO (note 2)
α57 Signal f = 57KHz 70 dB
SCA - SUBSIDIARYCOMMUNICATIONS AUTHORIZATION (note 3)
67 Signal f = 67KHz 75 dB
α
ACI - ADJACENTCHANNEL INTERFERENCE(note4)
114 Signalf = 114KHz 95 dB
α
190 Signalf = 190KHz 84 dB
α
MONO/ STEREO SWITCH
V
V
INTH
INTH
V
I
V
PI
PI
19
Pilot Threshold Voltage for stereo ”ON” 12 20 28 mV
Pilot Threshold Voltage for stereo ”OFF” 7 14 21 mV
Pilot Indicator Saturation Voltage I = 1mA 0.2 0.5 V
Pilot Indicator Leakage Current V = 9V 10
Control Voltage for forced mono α = < 3dB 0.8 V
STEREOBLEND
µ
RMS
RMS
A
V
V
16-17
16-17
Control Voltage for Channel
Separation
Control Voltage for Channel
Separation
= 6dB; VR= 3.6V (note 5) -0.31 -0.27 -0.23 V
α
= 26dB; -85 -55 -30 mV
α
3/11
TDA7338
ELECTRICALCHARACTERISTICS (continued)
HIGH CUT CONTROL
Symbol Parameter Test Condition Min. Typ. Max. Unit
VCO
τ
deemp
R
15-17
R
15-17
De-Emphasis Time Constant C13,C14= 1nF; V
High Cut Control Resistance V
= 50mV 43 50 57 K
15 - 17
High Cut Control Resistance V15 - 17 = -0.5V (note 5) 115 150 185 KΩ
= 50mV 43 50 57
15-17
s
µ
Ω
f
osc
f/f Capture and Holding Range
∆
V
VCO
Oscillator Frequency with Murata CSB456F11 456 KHz
V
CO OFF
Pin 7 0.6 V
NOISE INTERFACEDETECTOR (test condition:VSB>VR+ 50mV)
V
TR
V
TR
T
S
I
OS
V
N1
V
N2
V
N3
Trigger Threshold (note 6) V
Trigger Threshold V
Suppression Pulse Duration C
Input Offset Current during
suppression time
V
(pin 8) VIN= 0mV
PEAK
V
(pin 8) VIN= 50mV
PEAK
V
(pin 8) VIN= 100mV
PEAK
= 1.3V; PROG = GND 180 mV
PEAK
= 1.3V;
V
PEAK
PROG= OPEN/V
= 1.5V; PROG = GND 260 mV
PEAK
= 1.5V;
V
PEAK
PROG= OPEN/V
= 470pF 50
BLANK
DD
DD
RMS
; f = 150KHz 1.1 1.5 2 V
RMS
; f = 150KHz 1.7 2.3 2.8 V
RMS
NOTES TO THE CHARACTERISTICS
1 INTERMODULATIONSUPPRESSION
V
(signal)(at1KHz)
α2 =
O
V
(spurious)(at1KHZ)
O
;f
= (2 x 10KHz) - 19KHz
s
1%
±
250 mV
340 mV
10 pA
0.7 1.0 1.3 V
s
µ
α3 =
O
(spurious)(at1KHZ)
V
O
;f
= (3 x 13KHz) - 38KHz
s
(signal)(at1KHz)
V
measuredwith : 91% mono signal;9% pilot signal; fm=10KHzor 13KHz
2. TRAFFIC RADIO(V.F.) suppression
α57 (V.W.F.)
V
=
VO(spurious) (at1KHZ ±23Hz)
O(signal)
(
at1KHz
)
measuredwith : 91% stereo signal; 9% pilot signal; fm=1KHz; 5% subcarrier
(f=57KHz,fm = 23Hz AM,m = 60%)
3. SCA (SUBSIDIARYCOMMUNICATIONS AUTHORIZATION)
α67
V
O(signal)
=
V
(spurious)(at9KHZ)
O
at
(
1KHz)
;f
= (2x 38KHz) - 67KHz
s
measuredwith : 81% mono signal;9% pilot signal; fm=1KHz;
10% SCA - subcarrier(f
4/11
= 67KHz,unmodulated)
s
Loading...