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參數(shù)資料
| 型號(hào)： | LA7790M |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | QPSK Transmitter for Cable TV |
| 中文描述： | 調(diào)制變送器有線電視 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大小： | 174K |
| 代理商： | LA7790M |
4. Oscillator
The oscillator signal is divided by either 4 or 8, and supplied to the modulator as 0° and 90° switching signals. The
division mode can be selected using Band Switch 1 (pin 17).
Pin 17 = High
→
Modulation frequency = 1/4 oscillator frequency
Pin 17 = Low
→
Modulation frequency = 1/8 oscillator frequency
The oscillator requires an external coil and capacitors. Pins 14 & 15 should be DC coupled using a coil. A coil with
Qu of 30 or greater is required and the impedance between pins 14 and 15 is 6 k
. The value of the coupling
capacitors between pins 13 & 14 and pins 15 & 16 must be large enough so that the signal phase rotation is small.
Equivalent circuit of oscillator block
No. 5689-12/14
LA7790M
V
CC
1 k
1 k
2.2 mA
3 k
3 k
3.2 V
13
14
15
16
Unit (resistance :
)
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