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參數(shù)資料
| 型號： | 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)： | 13/14頁 |
| 文件大?。?/td> | 174K |
| 代理商： | LA7790M |
5. Oscillator Output
The output frequency of the oscillator is equal to or half of the output frequency of the modulator. The mode is set
using Band Switch 2 (pin 12).
Pin 12 = High
→
Oscillator output frequency = modulator frequency
Pin 12 = Low
→
Oscillator output frequency = 1/2 modulator frequency
6. Band Swtich
The input circuitry of Band Switch 1 (pin 17) and Band Switch 2 (pin 12) are the same. A low setting requires a
voltage of less than 1 V at the pin. A high setting requires a voltage between V
CC
–1 and V
CC
at the pin. Settings of
low or high generate currents of ±50 μA at pins 12 and 17.
Pin 12, 17 = High
→
Sink current = 50 μA
Pin 12, 17 = Low
→
Source current = 50 μA
Equivalent circuit of osc output and band switch blocks
The input circuitry of band switch 1 is same.
No. 5689-13/14
LA7790M
V
CC
20 k
20 k
40 k
Band
switch2
OSC
OUTPUT
12
11
20 k
from
Divider
from
Divider
20 k
LPF
1 mA
300
Unit (resistance :
)
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