LA7565E View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LA7565E

IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products

SANYO -> Panasonic 

LA7565E, 7565KM

Coil Specifications

JAPAN

f = 58.75 MHz

VCO coil

S

t=5t

0.12 ø

C = 24 pF

A12072

Test production no. V291XCS-3220Z

Toko Co., Ltd.

US

f = 45.75 MHz

S

t=6t

0.12 ø

C = 24 pF

A12073

Test production no. 291XCS-3188Z

Toko Co., Ltd.

SAW filter (SPLIT)

Picture

TSF1137U

Sound

Picture

TSF1241

Sound

PAL

f = 38.9 MHz

S

t=7t

0.12 ø

C = 24 pF

A12074

Test production no. 292GCS-7538Z

Toko Co., Ltd.

Picture

TSF5315

Sound

SAW filter (INTER)

TSF5220

TSF5221

TSF5321

TSF5344

Toko Co., Ltd.

2-1-17 Higashi-yukigaya, Ohta-ku, Tokyo, Japan TEL: +81-3-3727-1167

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

transformer. 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 transformer'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.

No. 6100-17/18

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