LA1265 Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Fabricante

LA1265

FM/AM Tuner of Electronic Tuning Type

SANYO -> Panasonic 

LA1265

6. If the coupling coefficient of the local OSC coil is small and an antiresonance point of approximately 100MHz is

present or the stray capacitance across pins 22 and 21 is large, a parasitic oscillation of approximately 100MHz may

occur in the buffer output (pin 22). In this case, connect a capacitance of approximately 30pF across pin 22 and GND.

7. AM OSC coil

Generally speaking, the following should be noted. Avoid winding with loose coupling between primary side and

secondary side (especially SW1, SW2). To put it concretely, the pot core type is better than the screw core type which

is loose in coupling. This prevents the local OSC frequency from turning third resonance frequency related to the

coupling coefficient.

8. Resistance across pin 8 and VDD.

If pin 8 is used for the stop signal (SD) only, without using LED, it is recommended to fix

resistance RL across pin 8 and GND to be 51kΩ to 100kΩ.

9. To prevent whistle from worsening, make the pattern of AM output pin 12 as short as

possible.

Input/Output Admittance

FM

– Parameter Frequency – Admittance Unit

IF

γi1

10.7MHz ri

330

Ω

ci

20

pF

AM

–

Parameter Frequency –

Admittance

AGC-off (V16=1.4V) AGC-on (V16=2.5V)

Unit

RF

γi19

1MHz

ri

15

16

kΩ

ci

4

4

pF

MIX

γo17 500kHz ro

–

–

kΩ

co

3

3

pF

IF

γi15

500kHz ri

2

2

kΩ

co

10

8

pF

Test Circuit : FM, AM-MW

Unit (resistance : Ω, capacitance : F)

T1 4147-1457-177 (Sumida)

T2 HW-40174 (Mitsumi)

T3a HW-40130, T3b HW-40131 (Mitsumi)

No.1820-5/15

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