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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(yè)數(shù)： | 8/14頁(yè) |
| 文件大小： | 174K |
| 代理商： | LA7790M |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)當(dāng)前第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)
1. Modulator
The modulator consists of two identical multiplier circuits, creating I and Q channels. Pins 4 & 5 and pins 8 & 9 are I
and Q channel inputs, respectively. These pins must be biased at 2.1 ± 0.2 V. Pin 6 is an internal 2.1 V bias. This
internal bias can be used if the I & Q data inputs are AC coupled, but an external bias must be used in the case of DC
coupled data inputs. Carrier suppression is improved if the offset voltages between pins 4 & 5 and pins 8 & 9 are
small.
(1) AC coupled application
(2) DC coupled application
No. 5689-8/14
LA7790M
4
+
I input
Q input
2.1 V
+
9
8
6
5
4
+
I input
2.1 V
2.1 V
Q input
+
+
+
9
8
6
5
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