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參數(shù)資料
| 型號(hào)： | LA1267 |
| 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)： | 5/14頁(yè) |
| 文件大?。?/td> | 556K |
| 代理商： | LA1267 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)當(dāng)前第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)
LA1267
No.2012-5/14
–
IF
Parameter Frequency
γ
i1
–
r
i
c
i
Admittance
330
20
Unit
pF
10.7MHz
FM
–
Parameter Frequency
–
RF
γ
i21
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
o19
500kHz
IF
γ
i17
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 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 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 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 :
, capacitance : F)
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