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PDF LA7566 Data sheet ( Hoja de datos )
| Número de pieza | LA7566 | |
| Descripción | VIF/SIF IF Signal-Processing Circuit with TV/VCR PAL and NTSC Multisound Support | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Ordering number : EN5764
Monolithic Linear IC
LA7566
VIF/SIF IF Signal-Processing Circuit with TV/VCR PAL
and NTSC Multisound Support
Overview
The LA7566 is a VIF/SIF IC that supports PAL and
NTSC multisound and that adopts a semi-adjustment-free
system. To simplify adjustment, the VIF block adopts a
technique in which AFT adjustment is no longer required
by VCO adjustment. The SIF block supports audio multi-
detection by adopting a PLL detection technique. The SIF
block provides 4 inputs with IC internal switching for easy
design of multi-sound systems. Additionally, these
switches can also be used for video system sound trap
switching. The LA7566 also includes a buzz canceller that
suppresses Nyquist buzz to achieve improved audio
quality.
Functions
[VIF Block]
• VIF amplifier • PLL detector • BNC • RF AGC
• EQ amplifier • AFT • IF AGC • Buzz canceller
[First SIF Block]
• First SIF amplifier • First SIF detector • AGC
[SIF Block]
• Multiple input switch • Limiter amplifier • PLL FM
detector
Package Dimensions
unit: mm
3067-DIP24S
[LA7566]
SANYO: DIP24S
Features
• No coils are used in the AFT and SIF blocks, making
these circuits adjustment free.
• PAL / NTSC multisound system can be constructed
easily.
• Built-in buzz canceller for excellent audio performance
Ambient temperature, Ta — °C
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Circuit voltage
Circuit current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
V7, V9, V10, V17
I1
I13
I18
Pd max
Topr
Tstg
Conditions
Ratings
10
VCC
–2
–3
–10
720
–20 to +70
–55 to +150
Unit
V
V
mA
mA
mA
mW
°C
°C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
31398HA (OT) No. 5764-1/11
1 page  
AC Characteristics Test Circuit Diagram
LA7566
Test Circuit
Input Impedance Test Circuit (VIF and first SIF input impedance)
Impedance analyzer
No. 5764-5/11
5 Page 
LA7566
Notes on VCO Tank Circuits
1. Built-in capacitor VCO tank circuits
When the power is turned on, the heat generated by the IC is transmitted through the printed circuit board to the VCO
tank circuit. At this point, the VCO coil frame functions as a heat sink and the IC heat is dissipated. As a result, it
becomes more difficult to transmit heat to the VCO tank cricuit's built-in capacitor, and the influence of drift at power
on is reduced. Therefore, it suffices to design the circuit so that the coil and capacitor thermal characteristics cancel.
Ideally, it is better to use a coil with a core material that has low temperature coefficient characteristics.
2. External capacitor VCO tank circuits
When an external capacitor is used, heat generated by the IC is transmitted through the printed circuit board directly
to the VCO tank circuit external capacitor. While this capacitor is heated relatively early after the power is turned on,
the coil is not influenced as much by this heat, and as a result the power-on drift is increased. Accordingly, a coil
whose core material has low temperature coefficient characteristics must be used. It is also desirable to use a
capacitor with similarly low temperature coefficient characteristics.
Note: Applications that use an external capacitor here must use a chip capacitor. If an ordinary capacitor is used,
problems such as the oscillator frequency changing with the capacitor orientation may occur.
s 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 loss.
s 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 responsibility 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.
s 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 March, 1998. Specifications and information herein are subject to
change without notice.
PS No. 5764-11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LA7566.PDF ] | |
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