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PDF TDA7338 Data sheet ( Hoja de datos )
| Número de pieza | TDA7338 | |
| Descripción | STEREO DECODER | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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TDA7338
STEREO DECODER
INTEGRATED 19KHz SC NOTCH FILTER
FOR PILOT CANCELLATION
ON CHIP FILTER FOR PILOT DETECTOR
AND PLL
ADJUSTMENT FREE VOLTAGE CONTROL-
LED OSCILLATOR
AUTOMATIC PILOT DEPENDENT MONO/
STEREO SWITCHING
NOISE BLANKING WITH PROGRAMMABLE
THRESHOLD
HIGH CUT CONTROL AND STEREO BLEND
INTEGRATED HIGH PASS FILTER FOR IN-
TERFERENCE DETECTOR
LEVEL INPUT FOR ADDITIONAL SPIKE DE-
TECTION ON FIELDSTRENGHT SIGNAL
VERY HIGH SUPPRESSION OF HARMONIC
AND INTERFERENCE SIGNALS
SO20
DIP20
ORDERING NUMBER: TDA7338(DIP20)
TDA7338D( SO20)
DESCRIPTION
The TDA7338 is a new concept of monolithic inte-
grated stereo decoder 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 con-
cept.
Avoiding the use of multipliers and non linear cir-
cuits a very high performance in terms of noise
suppression and total harmonic distortion is
reached.
December 1996
1/11
1 page  
NOTES TO THE CHZARACTERISTICS (continued)
4. ACI (ADJACENT CHANNEL INTERFERENCE)
α114
=
VO (signal) (at1KHz)
VO (spurious) (at4KHZ)
;
fs
=
110KHz -
(3
x
38KHz)
α190
=
VO (signal) (at1KHz)
VO (spurious) (at4KHZ)
;
fs
=
186KHz -
(5
x
38KHz)
measured with : 90% mono signal; 9% pilot signal; fm=1KHz; 1% spurious signal
(fs = 110KHz or 186KHz, unmodulated)
5. Control range typ 11% of VR (see figure 1 and figure2)
6. MEASUREMENT OF TRIGGER THRESHOLDS
All thresholds are measured by using a pulse
with TR = 2µs, THIGH = 2µs, and TF = 10µs.
The repetition rate must not increase the PEAK
voltage.
Vin
DC
VTR
TDA7338
D95AU365
TR THIGH
TF
Time
FUNCTIONAL DESCRIPTION
Signal Path
The TDA7338 Stereodecoder contains all neces-
sary functions for processing the MPX signal. Due
to the external input resistance (Pin 20) the circuit
can be adapted to different MPX input levels. Be-
hind a 80kHz lowpass filter the adjustment free
PLL for the pilot Tone is placed. The only external
component needed for the PLL is the ceramic
Figure 1: High Cut Control
fc
(KHz)
D95AU366
3.18
(=50µs)
2
VR=3.6V
resonator for the oscillator which runs at 456kHz.
The pilot detector output is designed as an open
collector output, therefore an external pullup re-
sistor is needed. To force the decoder to ”MONO”
Pin 19 has to be clamped to a voltage below
0.8V.
The voltage level (signal strength from the IF part)
applied to Pin 15 (VHCC) allows to control the
time constant of the deemphasis (nom. = 50µs,
see fig. 1). If the RF-signal is weak, the corner
Figure 2: Stereo Blend
SEP
(dB)
50
D95AU367
40
VR=3.6V
30
1
0
-0.5 -0.4 -0.3 -0.2 -0.1 0.0 VHCC-VR(V)
20
10
0
-0.40
-0.32
-0.24
-0.16
-0.08 VSB-VR(V)
5/11
5 Page 
TDA7338
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-
THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
© 1996 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet TDA7338.PDF ] | |
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