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LA1267 データシート(PDF) 5 Page - Sanyo Semicon Device

部品番号 LA1267
部品情報  FM/AM Tuner of Electronic Tuning Type
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メーカー  SANYO [Sanyo Semicon Device]
ホームページ  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA1267 データシート(HTML) 5 Page - Sanyo Semicon Device

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LA1267
No.2012-5/14
Parameter Frequency
Admittance
Unit
IF
γi1
10.7MHz
ri
330
ci
20
pF
FM
Parameter Frequency
RF
γi21
1MHz
ri
ro
ci
Admittance
Unit
k
pF
AGC-off (V16=1.4V)
AGC-on (V16=2.5V)
15
16
4
4
MIX
γo19
500kHz
co
k
pF
3
3
ri
IF
γi17
500kHz
co
k
pF
2
2
10
8
AM
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 24 and 23 is large, a parasitic oscillation of approximately 100MHz may
occur in the buffer output (pin 24). In this case, connect a capacitance of approximately 30pF across pin 24 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 51k
Ω to 100kΩ.
9. To prevent whistle from worsening, make the pattern of AM output pin 14 as short as possible.
Input/Output Admittance
Test Circuit : FM, AM-MW
T1 : 4147-1457-177 (Sumida)
T2 : HW-40174 (Mitsumi)
T3 : HW-40130, 40131 (Mitsumi)
Unit (resistance :
Ω, capacitance : F)


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