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PDF LA3375 Data sheet ( Hoja de datos )
| Número de pieza | LA3375 | |
| Descripción | Pilot Cancel-Provided PLL FM MPX Demodulator for Car Stereos | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number:ENN901E
Monolithic Digital IC
LA3375
Pilot Cancel-Provided PLL
FM MPX Demodulator for Car Stereos
Overview
The LA3375 integrates two functions : skip-noise preven-
tion and pilot cancelling. It is a multiplex, 16-pin IC for
FM car stereos.
Functions
• Pilot-cancelling (level-following).
• Stereo noise controlling (SNC).
• High-cut control (HCC).
• Stereo-monaural automated selection (with priorities for
pilot inputs).
• VCO oscillation damping.
Features
• Low distortion (0.05% typ., 300-mV input, mono.).
• Power supply ripple rejection (35 dB typ.).
• Wide operating voltage range (VCC=6.5 to 14V).
• Small due to single-ended package.
• 3 mm pitch-pin spacing makes it easy to use in printed
circuit boards.
Package Dimensions
unit:mm
3193-SIP16Z
[LA3375]
24.2
3.25
1
0.85
3.0
0.5
3.0
1.5
16
0.25
1.5
SANYO : SIP16Z
Specifications
Absolute Maximum Ratings at Ta = 25˚C
Parameter
Maximum supply voltage
Lamp driving current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
IL max
Pd max
Topr
Tstg
Ta≤45˚C
Recommended Operating Conditions at Ta = 25˚C
Parameter
Recommended power supply voltage
Imput signal voltage
Symbol
VCC
vi
Conditions
Conditions
Ratings
16
40
520
–20 to +70
–40 to +125
Unit
V
mA
mW
˚C
˚C
Ratings
6.5 to 14
200 to 300
Unit
V
mV
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
10700TH (KT)/90196RM/D177KI/8044KI/5205KI/ No.901–1/11
1 page  
LA3375
4. SNC (stereo noise control) and HCC (high-cut control)
The LA3375 has SNC and HCC terminals for improved S/N ratios when operating in weak radio fields. By adjusting
the SNC terminal, noises unique to stereo FM in weak fields can be reduced. The HCC terminals permits further
improvement of effective S/N ratios by lowering treble levels of FM noises in weak fields. (See Fig. 2)
STEREO deteriorates approximately 21.7 dB (compared to MONO) in weak radio feilds (Fig. 2). Generally, when
S/N ratios deteriorate below 30 to 40 dB, noises become quite noticeable. Section (1) shows ways to set SNC and
HCC when radio field strengths are divided into 3 regions, A, B, and C, (Fig. 2). SNC is expected to function in
region A, and HCC in region B. In region C, shallow muting is effected in the IF stage.
(1) SNC (stereo noise control)
Stereo S/N ratios deteriorate 21.7 dB below monaural but can be improved by varying stereo separation. S/N
improvement becomes apparent, however, only when the separation is 20 dB or worse. In that case, the relation
between separation and S/N improvement is shown in Fig. 5.
SNC in the LA3375 improves S/N ratios in weak radio fields by varying separation. It varies subsignal demodula-
tion level and controls separation. By using the IF stage signal meter level output as the source of the control
signal, S/N ratios in region A of Fig. 2 can be maintained at about 40 dB or better. Ideal S/N enhancements should
provide gradual switching over from stereo to monaural to maintain constant S/N ratios, starting from a point in
region A for 40-dB stereo S/N toward a point for 40-dB monaural S/N. Methods to set the control level will be
described later.
Fig. 3 shows voltages applied to pin 8 (SNC terminal) of the LA3375 versus separation characteristics (SNC
characteristics). Pin 8 is also the base of a PNP transistor, so stereo mode is set when pin 8 is open and monaural
mode is set when it is grounded. SNC terminal control is effective only when locked with pilot signals and when
stereo indicator is lit. External circuit parameters can be chosen in large values that do not affect the IF stage
meter output circuit because SNC control currents are small. This makes designing easy. (See Fig. 6)
(2) Designing external circuits for SNC characteristics
We recommend the following as a way to designate SNC characteristics to have smooth transition of separation
from stereo to monaural in region A of Fig. 2.
Separation vs S/N-enhancement relation ....................................................... Refer to Fig. 5.
SNC terminal voltages vs separation characteristics ..................................... Refer to Fig. 3.
Antenna inputs vs S/N improvement characteristics can be obtained from the drawing if the graph for IF-stage
signal meter output vs antenna iuput and the graph for stereo S/N-ratio vs antenna input are known. From desired
S/N characteristics, SNC terminal voltage characteristics can also be obtained.
Sample drawings are shown in Fig. 4, where for simplicity’s sake, SNC, IF meter, and stereo S/N characteristics
have been approximated with straight lines.
For instance :
To obtain stereo S/N improvement characteristics from SNC characteristics, when (a) in the second quadrant of
the chart represents bare SNC characteristics, point 1 projected to the third quadrant shows a 20 dB separation
and a 1 dB S/N improvement. When projected from the frist to the fourth quadrant, a point improved by 1 dB
in S/N over the stereo S/N line in the fourth quadrant corresponds to point 1.
Similarly, point 2 on the SNC characteristics in the second quadrant corresponds to point 2 in the fourth
quadrant. Point 3 in the second quadrant corresponds to point 3 in the fourth quadrant. Stereo S/N improve-
ment characteristics for each point are obtainable.
Similarly, (b) characteristics in the second quadrant are projected to form (b) characteristics in the fourth
quadrant, and (c) in the second quadrant to form (c) in the fourth quadrant, thus providing a way to diagram
improvement characteristics.
In the resulting drawings, ideal S/N improvement characteristics are similar to (b) in the fourth quadrant, but
corresponding SNC characteristics have to be (b) characteristics in the second quadrant which are difficult to
realize. Among realistic characteristics, something like (c) appears to be satisfactory. The (c) SNC characteristics
are obtained with a shift by two diodes together with a 1/2 bleeder.
No.901–5/11
5 Page 
LA3375
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer's
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer's products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products(including technical data,services) described or
contained herein are controlled under any of applicable local export control laws and regulations,
such products must not be exported without obtaining the export license from the authorities
concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"
for the SANYO product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not
guaranteed for volume production. SANYO believes information herein is accurate and reliable, but
no guarantees are made or implied regarding its use or any infringements of intellectual property rights
or other rights of third parties.
This catalog provides information as of January, 2000. Specifications and information herein are subject
to change without notice.
PS No.901–11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LA3375.PDF ] | |
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