參數(shù)資料
型號: LA7780M
廠商: Sanyo Electric Co.,Ltd.
英文描述: QPSK Downconverter for CATV Systems
中文描述: 調(diào)制變頻器的有線電視系統(tǒng)
文件頁數(shù): 5/9頁
文件大?。?/td> 242K
代理商: LA7780M
No. 5268-5/9
LA7780M
Pin No.
Function
Pin voltage (V)
Note
Equivalent circuit
1
RF1 input
2.8
Impedance connected to pin 2 must be > 45
2
RF gain
1.3
3
GND
0
4
RF1 output
Open collector
5
6
7
V
CC
V
CC
GND
5.0
5.0
0
V = 2.5 V
R = 1 k
8
9
RF2 input (1)
RF2 input (2)
2.5
2.5
Pin 10
GND : Internal or external AGC
(narrow control range)
Pin 10
open : External AGC (wide control range)
10
Internal/external
AGC switch
0 (GND)
1.0 (open)
I1 = 20 μA
I2 = 100 μA
I3, I4 & Q1 are switched on and off by pin 10.
11
12
AGC filter 2
AGC filter 1
Open collector
Open base
(Pin 10
GND)
4.0 (Pin 10 open)
Continued on next page.
Pin Descriptions
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