|
|
PDF LA7578N Data sheet ( Hoja de datos )
| Número de pieza | LA7578N | |
| Descripción | IF Signal Processing (Super PLL-II VIF + SIF) Circuit for TVs and VCRs | |
| Fabricantes | Sanyo | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LA7578N (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
|
No Preview Available !
Ordering number: EN 4952
Monolithic Linear IC
LA7578N
IF Signal Processing (Super PLL-II VIF + SIF)
Circuit for TVs and VCRs
Overview
The LA7578N is an intercarrier-type VIF + SIF IC that
supports excellent sound quality and image quality.
The pin assignment of the LA7578N is identical to that of the
LA7577N, allowing the LA7577N to be used for split systems
while the LA7578N is used for intercarrier systems. In
addition, the LA7578N suppresses Nyquist buzz interference
by using a PLL detection system with a buzz canceller in order
to provide the best sound quality possible.
Package Dimensions
unit : mm
3067-DIP24S
[LA7578N]
Functions
[VIF Block]
. VIF amplifier
. VCO
. APC filter
. B/W NC
. AFT
. IF AGC
.[SIF Block]
Limiter amplifier
[Mute]
. Audio mute (pin 2)
. IS-15 switch (pin 13)
. PLL detector
. Equalizer amplifier
. Lock detection
. RF AGC
. APC detector
. Buzz canceller
. FM quadrature detector
. AV mute (pin 4)
.Features
Excellent buzz and buzz-beat characteristics due to PLL
detection system with buzz canceller.
. Built-in APC time constant switch.
. Duplicate time constant system suited for high-speed AGC.
. Excellent DG and DP characteristics.
. RF AGC adjustment is simple.
SANYO : DIP24S
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
81095HA (II)No.4952 - 1/18
1 page  
Sample Application Circuit (JAPAN)
When using no SIF, 1stSIF, AFT, RFAGC.
LA7578N
1. When using no SIF circuit:
Pin1 = Open
Pin2 = GND
Pin24 = Open
2. When using no AFT circuit:
Pin11, 12 = GND
Pin14 = Open
3. When using no RFAGC circuit:
Connect a capacitor of 0.01 µF across Pin 4 and GND.
Pin10 = Open
Unit (resistance : Ω, capacitance : F)
No.4037-5/18
5 Page 
LA7578N
Pins 5 and 6 (VIF input)
These are the VIF amplifier input pins. The inputs must always
have their DC components eliminated with capacitors. The
inputs are equilibrium inputs.
The input impedance is R 6 1.5 kΩ, C 6 3 pF.
Fig. 12
Sanyo’s SAW filter
There are two types of filters, depending on the piezoelectric substrate material.
(1) LiTaO3 (lithium tantalate) SAW filters: ...... TSF1xxx
TSF2xxx
While the LiTaO3 SAW filters offer excellent stability with a low temperature coefficient of –18 ppm/ °C, the insertion loss
is high. However, by using a coil, etc., for matching on the SAW filter output side (which does increase the number of
external components), it is possible to suppress the insertion loss while at the same time making the level of the
characteristics variable, which provides additional design freedom. (Refer to Fig. 13.)
In addition, because the SAW (surface wave) reflection is small, ripple within the band can be kept low.
(2) LiNbO3 (lithium niobate) SAW filter: ...... TSF5xxx
While the LiNbO3 SAW filter has a high temperature coefficient of −72 ppm/ °C, it has a lower insertion loss by about
10 dB compared to the LiTaO3 SAW filters. Therefore, matching on the output side of the SAW filter is not necessary. (Refer
to Fig. 14.)
In addition, because the insertion loss is low (although the ripple within the band is somewhat higher than in the case of the
LiTaO3 SAW filter), the low impedance and small feedthrough diminish the effects of peripheral circuit components and the
pattern layout, and make it possible to stabilize the trap characteristics outside of the band.
From the above, it is clear that the LiTaO3 SAW filter is suitable for Japan and U.S. bands where the IF frequency is high, while
the LiNbO3 SAW filter is suitable for PAL and U.S. bands where the IF frequency is low.
0.01µF
Fig. 13
Fig. 14
0.01µF
No.4037-11/18
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LA7578N.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LA7578N | IF Signal Processing (Super PLL-II VIF + SIF) Circuit for TVs and VCRs | Sanyo |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |