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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） |
| 文件頁數(shù)： | 4/15頁 |
| 文件大?。?/td> | 1034K |
| 代理商： | LA1265 |
LA1265
No.1820-4/15
3. Local OSC buffer output
When local OSC buffer output wave form is saw-toothed at the SW mode, connect a resistance of 1.2k
or
thereabouts across pin 22 and GND.
4. AM input pin
It is desirable that the AM input pin (pin 19) be L-coupled to pin 18.
Inputting to pin 19 can be done by DC-cutting with a capacitor. However, an unbalance in the RF amplifier
(differential amplifier) causes gain drop and whistle worsening.
5. 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 automatic channel select mode. In this 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.
LED lighting sensitivity setting for FM.
– For the LED lighting sensitivity setting for FM, the IC
input may be 45dBμ to 60dBμ. With the variations in the
front end considered, it is ideal that the IC input in a
standard receiving set be 51dBμ to 54dBμ. The lower
value of VR2 for the LED lighting sensitivity setting is as
illustrated right. Since the variations in the front end cause
the IC input setting sensitivity to vary, it is recommended
to use a value of VR2 at an input voltage lower than a
standard setting by 6dB or greater. For example, if IC
input 53dBμ is taken as a standard, use VR2
≤
100k
at IC
input 47dBμ.
2. AM/FM changeover
Two selections are available for changeover as shown below
: (A) pin 17-used method and (B) pin 18-used method.
For (A), the voltage on pin 17 relative to V
CC
(pin 7) must be within the range of –0.8V to +0.1V. If not within this
range, distortion and selectivity will get worse.
For (A), a resistance of 68k
at the IFT cold terminal, which is used to prevent the changeover circuit from
malfunctioning, must be connected.
(A) pin 17-use method for AM/FM changeover
(B) Pin 18-used method for AM/FM changeover
IC input – dBμ
Semifixed Variable Resistor for FM
V
LED lighting sensitivity setting for FM
Ideal setting range
Modulation frequency – Hz
V9 – Modulation Frequency
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相關(guān)代理商/技術(shù)參數(shù) |
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