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PDF LA3376 Data sheet ( Hoja de datos )
| Número de pieza | LA3376 | |
| Descripción | Pilot Cancel-Provided PLL FM MPX Demodulator for Car Stereos | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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Ordering number:ENN1236C
Monolithic Digital IC
LA3376
Pilot Cancel-Provided PLL
FM MPX Demodulator for Car Stereos
Overview
The LA3376 is a multiplex IC for use in car stereo applica-
tions. It contains 2 functions of skip noise control and pilot
cancel and is packaged in 16-pin SEP
Functions
• Pilot canceler (level-follow-up type).
• Stereo noise controller (SNC function).
• High-cut controller (HCC function).
• Automatic selection between stereo and monaural.
• VCO oacillation stop
• Forced monaural function (stereo lamp off, pilot cancel
and HCC function hold) of reception mode is realized
by disconnecting pin 10 from VCC.
Package Dimensions
unit:mm
3193-SIP16Z
[LA3376]
24.2
3.25
1
0.85
3.0
0.5
3.0
16
0.25
1.5
1.5
Method of forced monaural at stereo reception
PIN 8 GND
7.3V or more applied to PIN 7
PIN 11 GND
PIN 10 disconnected
LA3375
°
°
°
×
LA3376
°
°
°
°
Lamp
ON
OFF
OFF
OFF
Features
• Low distortion (0.05% typ 300mV input mono).
• Good ripple rejection of power supply (35dB typ.).
• Wide supply voltage range (VCC=6.5 to 14V).
• Good space factor due to single-end package.
• Easy to draw printed circuit pattern due to pin-to-pin space
of 3mm.
HCC Pilot cancel
°°
××
°×
°°
SANYO : SIP16Z
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.1236–1/12
1 page  
LA3376
Cautions when employing sample application circuits
1) Adjust separation by 10kΩ potentiometer in low pass filter.
2) Adjust RS for noise detection sensitivity under strong to medium radio fields. Set at appropriate value.
3) Adjust noise AGC by CY and RY to enhance noise suppression in medium to weak radio fields.
4) Adjust pilot cancellation by 50kΩ potentiometer connected to pin 15 of LA2110.
5) Reponse speeds of pilot cancellation to follow levels can be varied by adjusting capacitance value of 1µF capacitor
connected across pins 11 and 12 of LA3376. Distortion factors deteriorate with reduction in value.
6) Adjusting pilot cancellation.
For example consider the sample application circuit 2. Assume the input signal consists only of pilot signals. First
connect an oscilloscope and a valve voltmeter to pin 2 of the LA2110. Set their ranges for V : 200mV/div. AC, H :
20µs/div.
When oscilloscope waveform is
turn pilot cancel control to change it to the following :
Then, adjust pilot cancel control to minimize indications of valve voltmeter.
When the LA3376 alone is used (sample application circuit 1), adjust cancel control through a 19kHz BPF to
minimize carrier leakage level at output pins (pins 5 and 6).
*Refer to the LA2110 catalog for LA3376/LA2110 applications and characteristics.
1. Pilot cancelling circuit
A level-following type has been used. Once set, it can easily accommodate varying pilot modulation depths among
stations. Cancelling signal is a sawtooth wave obtained by integrating a square wave that is proportionate in ampli-
tude to pilot level with C and R.
2. Separation adjustments
The LA3376 has separation parameters that have been set to provide maximum separation when used in conjunction
with the LA2210, a noise-canceler IC, or the equivalent. The LA3376 by itself exhibits separation only in a 25 to
30dB range. If a phase correction circuit is provided in the LA3376 input circuit, it can exhibit intrinsic separation
charactersitics, typically 50dB.
3. Adjusting the free running frequency
Use a timing set resistor and a semi-set resistor, when connecting a frequency counter. Connect the counter with a
high impedance input to the connection between these resistors with a 100-kΩ resistor, as shown in figure 1.
No.1236–5/12
5 Page 
LA3376
No.1236–11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LA3376.PDF ] | |
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