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參數(shù)資料
| 型號(hào)： | LA1265 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | FM/AM Tuner of Electronic Tuning Type(電子調(diào)諧型FM/AM調(diào)諧器) |
| 中文描述： | 調(diào)頻/調(diào)幅調(diào)諧器（電子調(diào)諧型調(diào)頻/調(diào)幅調(diào)諧器電子調(diào)諧型） |
| 文件頁(yè)數(shù)： | 5/15頁(yè) |
| 文件大小： | 1034K |
| 代理商： | LA1265 |
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LA1265
No.1820-5/15
–
IF
Parameter Frequency
γ
i1
–
r
i
c
i
Admittance
330
20
Unit
pF
10.7MHz
FM
–
Parameter Frequency
–
RF
γ
i19
1MHz
r
i
c
i
r
o
c
o
r
i
c
o
Admittance
Unit
k
pF
k
pF
k
pF
AGC-off (V16=1.4V)
15
4
–
3
2
10
AGC-on (V16=2.5V)
16
4
–
3
2
8
MIX
γ
o17
500kHz
IF
γ
i15
500kHz
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 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 V
DD
.
If pin 8 is used for the stop signal (SD) only, without using LED, it is recommended to fix
resistance R
L
across pin 8 and GND to be 51k
to 100k
.
9. To prevent whistle from worsening, make the pattern of AM output pin 12 as short as
possible.
Input/Output Admittance
Test Circuit
: FM, AM-MW
T1 4147-1457-177 (Sumida)
T2 HW-40174 (Mitsumi)
T3a HW-40130, T3b HW-40131 (Mitsumi)
Unit (resistance :
, capacitance : F)
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