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參數(shù)資料
| 型號： | LA1266 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | FM/AM System 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)幅系統(tǒng)（電子調(diào)諧型調(diào)頻/調(diào)幅調(diào)諧器電子調(diào)諧型） |
| 文件頁數(shù)： | 4/11頁 |
| 文件大?。?/td> | 343K |
| 代理商： | LA1266 |
LA1266
No.2291-4/11
2. AM/FM changeover
AM/FM changeover is made using pin 20 as shown right.
However, the voltage on pin 20 relative to V
CC
(pin 7) must be within
the range of +0.1V to – 0.8V. If not within this range, distortion and
selectivity will get worse. A resistance of 68k
at the IFT cold terminal,
which is used to prevent the changeover circuit from malfunctioning,
must be connected.
3. Local OSC buffer output
When local OSC buffer output waveform is saw-toothed at the SW mode, connect a reistance of 1.2k
or
thereabouts across pin 24 and GND.
4. Capacitance across pin 9 and GND
A large capacitance across pin 9 and GND may cause a
misstop at an adjacent channel when the channel select
speed is made faster at the autmatic channel select mode.
In thes case, decrease the capacitance across pin 9 and
GND.
However, if too decreased, the LED will flutter at low
modulation frequencies at the time of detuning.
Therefore, it is recommended to fix the capacitance
across pin 9 and GND to be 3.3μF to 10μF.
The relation between modulation frequency and
demodulation output voltage on pin 9 with the
capacitance across pin 9 and GND as a parameter is
shown right.
5. 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 pin 24 and pin 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.
6. 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 be concrete, the pot core type is better than the screw type which is loose
in coupling. This prevents the local OSC frequency from turning third
resonance frequency related to the coupling coefficient.
7. Resistance across pin 8 and V
DD
If pin 8 is used for stop signal (SD) only, without using LED, it is
recommended to fix resistance R
L
across pin 8 and V
DD
to be 51k
to
100k
.
8. To prevent whistle from worsening, make the pattern of AM output pin 15 as
short as possible.
9. AM, FM IF buffer output
Application of a voltage to pin 13 (STRQ) causes AM IF(455kHz) signal (at AM mode) and FM IF(10.7MHz) signal
(at FM mode) to be delivered at pin 11 and pin 10, respectively. It is recommended that the voltage to be applied to
68k
V9
–
Modulation Frequency
V
–
m
Modulatin frequency
–
Hz
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