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PDF LA3370 Data sheet ( Hoja de datos )
| Número de pieza | LA3370 | |
| Descripción | PLL FM Multiplex Stereo Demodulator for Car Stereo | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : EN619H
Monolithic Linear IC
LA3370
PLL FM Multiplex Stereo Demodulator
for Car Stereo
Overview
Package Dimensions
The LA3370 is a multiplex IC for FM car stereo, and it has
the following 2 functions through its utilization of the IF
meter output voltage, etc.
unit: mm
3020A-SIP16
1. Stereo noise control (SNC) under which the noise
[LA3370]
particular to the FM stereo unit in the weak electric
field is reduced smoothly.
2. High-cut control (HCC) under which the high
frequency is smoothly attenuated. In additioin, the
LA3370 can be, due to its low distortion factor, an IC
for multiplex stereo demodulator which is appropriate
for the car component stereo unit.
Functions
• Stereo noise control (SNC terminal)
SANYO: SIP16
Through controlling the quality of sound from stereo mode to monaural mode with the voltage applied to the control
pin, the FM stereo noise in the weak electric field is reduced by this function.
• High-cut control function (HCC terminal)
The FM noise in the weak electric field is reduced through the attenuation of high frequency thereof.
Such attenuation can be changed smoothly from "Normal" to "High Cut" by controlling the voltage applied to the
control pin. The volume of "High Cut" can be selected by using an external capacitor.
• Stereo-monaural automatic select
This selection has priority over the stereo noise control. Pilot input prioritized.
• Stoppage of VCO oscillation
When a voltage of 7.5V or higher is applied to the HCC terminal, the oscillation of VCO can be discontinued. In this
case, the stereo lamp does not malfunction.
• With separation control terminal.
Features
• Low distortion factor. (0.05% typ. 300mV input, mono)
• The ripple of power source can effectively be rejected. (35dB typ.)
• The range of voltage to be used is wide. (VCC=6.5 to 14V)
• The space factor is advantageous because of the single-end package.
• The printed circuit board can easily be prepared as 3mm pitch is used between the pins.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
63097HA (KOTO) / 8288YT/3018TA/5205MW, TS No.619-1/11
1 page  
LA3370
(3) HCC (high-cut control)
In region B where S/N deteriorates to 40dB or worse even for monaural, the S/N as sensed by the human ear can be
enhanced by suppressing levels at frequencies above approximately 7kHz. Treble region levels that follow meter
voltages can be smoothly attenuated (high-cut control) by impressing IF stage signal meter output to the HCC pin
(pin7) of the LA3370. Fig.7 shows MPX output frequency characteristics (monaural) provided by voltage impressed
on pin 7. Frequency characteristics for a 100% high cut can be determined by an external capacitor connected to pin
4. An equivalent circuit is shown below where the designation is made by the 5kΩ and the C time constant.
Approximate values provided by C as expressed in attenuation at 10kHz are listed in table below : right.
Fig. 8 shows the relation between voltages impressed on pin 7 and rates (%) of high cut (HCC). When IF meter
output voltage characteristics and region B, S/N characteristics, of Fig. 2 have been obtained, S/N improvement by
HCC can be drawn in a way similar to drawing SNC chracteristics.
Fig.2 shows typical meter outputs of a quadrature detection IF amplifier IC. (Fig. 1 shows data for LA1140) HCC
characteristics have been designated to permit region B improvements when the IC is directly connected to HCC
(pin 7) terminal of the LA3370. The infinitesimal control currents at pin 7, similar to pin 8, do not affect meter
outputs.
(4) SNC and HCC connection circuits when coupled with the IF stage.
Fig. 1 shows sample S/N characteristics via antenna inputs when SNC and HCC are connected with the IF stage by
an external circuit.
(5) S/N improvements in region C of Fig.1
Because S/N ratios deteriorate even further in the region C of Fig. 1, it is better to improve the S/N in this region
with IF mutings. The LA1140 is available to linearly vary the IF muting. Employment of the LA3370 together with
the LA1140 further enhances S/N improvement.
No.619-5/11
5 Page 
LA3370
No products described or contained herein are intended for use in surgical implants, life-support systems,
aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and
the like, the failure of which may directly or indirectly cause injury, death or property lose.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates,
subsidiaries and distributors and all their officers and employees, jointly and severally, against any
and all claims and litigation and all damages, cost and expenses associated with such use:
Not impose any responsibilty for any fault or negligence which may be cited in any such claim or
litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of
their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guarant-
eed 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 June, 1997. Specifications and information herein are subject to
change without notice.
No.619-11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LA3370.PDF ] | |
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