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1397CS 参数 Datasheet PDF下载

1397CS图片预览
型号: 1397CS
PDF下载: 下载PDF文件 查看货源
内容描述: 单/双/四核400MHz的电流反馈放大器 [Single/Dual/Quad 400MHz Current Feedback Amplifier]
分类和应用: 放大器
文件页数/大小: 20 页 / 734 K
品牌: Linear [ Linear ]
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LT1395/LT1396/LT1397  
O U  
W
U
PPLICATI  
S I FOR ATIO  
A
input impedance when considered in parallel with R10.  
R10 also connects to the inverting input of amplifier A2,  
adding the B contribution to the Y signal as discussed  
above. Amplifier A4 is configured in a noninverting gain  
of 2 configuration with the bottom of the gain resistor R4  
tied to the Y output. The output of amplifier A4 thus  
results in the color-difference output B-Y.  
R8 and R9 are grounded. This results in a gain of 2.41 and  
a contribution at the output of A2 of 2Y. The R-Y input is  
amplified by A2 with the gain set by resistors R8 and R10,  
giving an amplification of –1.02. This results in a contri-  
bution at the output of A2 of 1.02Y – 1.02R. The B-Y input  
is amplified by A2 with the gain set by resistors R9 and  
R10, giving an amplification of 0.37. This results in a  
contribution at the output of A2 of 0.37Y – 0.37B.  
The G input also arrives via 75coax and adds its  
contributiontotheYsignalviaa432resistorR9, which  
is tied to the inverting input of amplifier A2. There is also  
a 90.9termination resistor R12, which yields a 75Ω  
termination when considered in parallel with R9. Using  
superposition, it is straightforward to determine the  
output of amplifier A2. Although inverted, it sums the R,  
G and B signals in the standard proportions of 0.3R,  
0.59G and 0.11B that are used to create the Y signal.  
Amplifier A3 then inverts and amplifies the signal by 2,  
resulting in the Y output.  
IfwenowsumthethreecontributionsattheoutputofA2,  
we get:  
A2OUT = 3.40Y – 1.02R – 0.37B  
It is important to remember though that Y is a weighted  
sum of R, G and B such that:  
Y = 0.3R + 0.59G + 0.11B  
If we substitute for Y at the output of A2 we then get:  
A2OUT = (1.02R – 1.02R) + 2G + (0.37B – 0.37B)  
= 2G  
Buffered Color-Difference to RGB Matrix  
Theback-terminationresistorR11thenhalvestheoutput  
of A2 resulting in the G output.  
An LT1395 combined with an LT1396 can be used to  
create buffered RGB outputs from color-difference sig-  
nals (Figure 5). The R output is a back-terminated 75Ω  
signal created using resistor R5 and amplifier A1 config-  
ured for a gain of +4 via resistors R3 and R4. The  
noninverting input of amplifier A1 is connected via 1k  
resistors R1 and R2 to the Y and R-Y inputs respectively,  
resulting in cancellation of the Y signal at the amplifier  
input. The remaining R signal is then amplified by A1.  
R1  
1k  
Y
R2  
R5  
+
1k  
75  
A1  
R-Y  
R
1/2 LT1396  
R3  
267Ω  
R4  
88.7Ω  
R6  
205Ω  
R11  
75Ω  
+
The B output is also a back-terminated 75signal  
created using resistor R16 and amplifier A3 configured  
foragainof+4viaresistorsR14andR15.Thenoninverting  
input of amplifier A3 is connected via 1k resistors R12  
and R13 to the Y and B-Y inputs respectively, resulting in  
cancellation of the Y signal at the amplifier input. The  
remaining B signal is then amplified by A3.  
R7  
1k  
A2  
LT1395  
G
R10  
267Ω  
R8  
261Ω  
R9  
698Ω  
B-Y  
R12  
1k  
R16  
75Ω  
+
A3  
R13  
1k  
B
1/2 LT1396  
R14  
The G output is the most complicated of the three. It is a  
weighted sum of the Y, R-Y and B-Y inputs. The Y input  
is attenuated via resistors R6 and R7 such that amplifier  
A2’s noninverting input sees 0.83Y. Using superposition,  
we can calculate the positive gain of A2 by assuming that  
267Ω  
ALL RESISTORS 1%  
= ± 5V  
V
S
R15  
88.7Ω  
1395/6/7 F05  
Figure 5. Buffered Color-Difference to RGB Matrix  
139567fc  
12  
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