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參數(shù)資料
| 型號(hào)： | LA1267 |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDIP24 |
| 封裝： | DIP-24 |
| 文件頁(yè)數(shù)： | 9/14頁(yè) |
| 文件大小： | 536K |
| 代理商： | LA1267 |
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LA1267
No.2012-4/14
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
Ω or
thereabouts across pin 24 and GND.
4. AM input pin
It is desirable that the AM input pin (pin 21) be L-coupled to pin 20.
Inputting to pin 21 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
≤100kΩ at IC input 47dBμ.
2. AM/FM changeover
Two selections are available for changeover as shown below
: (A) pin 19-used method and (B) pin 20-used method.
For (A), the voltage on pin 19 relative to VCC (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
Ω at the IFT cold terminal, which is used to prevent the changeover circuit from
malfunctioning, must be connected.
(A) pin 19-use method for AM/FM changeover
(B) Pin 20-used method for AM/FM changeover
IC input – dBμ
Semifixed Variable Resistor for FM
VR2
semifixed
variable
resistor
value
–
k
Ω
LED lighting sensitivity setting for FM
Ideal setting range
Modulation frequency – Hz
V9 – Modulation Frequency
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