công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
|
LA1267 bảng dữ liệu(PDF) 4 Page - Sanyo Semicon Device |
|
LA1267 bảng dữ liệu(HTML) 4 Page - Sanyo Semicon Device |
4 / 14 page 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 LED lighting sensitivity setting for FM Ideal setting range Modulation frequency – Hz V9 – Modulation Frequency |
Số phần tương tự - LA1267 |
|
Mô tả tương tự - LA1267 |
|
|
Link URL |
Chính sách bảo mật |
ALLDATASHEET.VN |
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không? [ DONATE ] |
Alldatasheet là | Quảng cáo | Liên lạc với chúng tôi | Chính sách bảo mật | Trao đổi link | Tìm kiếm theo nhà sản xuất All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |