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LT1399CS#TRPBF 参数 Datasheet PDF下载

LT1399CS#TRPBF图片预览
型号: LT1399CS#TRPBF
PDF下载: 下载PDF文件 查看货源
内容描述: [LT1399 - Low Cost Dual and Triple 300MHz Current Feedback Amplifiers with Shutdown; Package: SO; Pins: 16; Temperature Range: 0°C to 70°C]
分类和应用: 放大器
文件页数/大小: 16 页 / 232 K
品牌: Linear [ Linear ]
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LT1398/LT1399/LT1399HV  
O U  
W
U
PPLICATI  
A
S I FOR ATIO  
The G input also arrives via 75coax and adds its  
contributiontotheYsignalviaa549resistorR9, which  
is tied to the inverting input of amplifier A2. There is also  
an 86.6termination 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 B1 then inverts and amplifies the signal by 2,  
resulting in the Y output.  
R10, giving an amplification of 0.37. This results in a  
contribution at the output of A2 of 0.37Y – 0.37B.  
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  
The LT1399 can be used to create buffered RGB outputs  
from color-difference signals (Figure 9). The R output is  
a back-terminated 75signal created using resistor R5  
and LT1399 amplifier A1 configured for a gain of +2 via  
324resistors 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 cancella-  
tion of the Y signal at the amplifier input. The remaining  
R signal is then amplified by A1.  
Theback-terminationresistorR11thenhalvestheoutput  
of A2 resulting in the G output.  
R1  
1k  
Y
R2  
1k  
R5  
75  
+
A1  
R-Y  
R
1/3 LT1399  
R3  
324Ω  
The B output is also a back-terminated 75signal  
created using resistor R16 and amplifier A3 configured  
for a gain of +2 via 324resistors R14 and R15. The  
noninverting input of amplifier A3 is connected via 1k  
resistors R12 and R13 to the Y and B-Y inputs respec-  
tively, resulting in cancellation of the Y signal at the  
amplifier input. The remaining B signal is then amplified  
by A3.  
R4  
324Ω  
R6  
205Ω  
R11  
75Ω  
+
A2  
R7  
1k  
G
1/3 LT1399  
R10  
324Ω  
R8  
316Ω  
R9  
845Ω  
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  
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  
B-Y  
R12  
1k  
R16  
75Ω  
+
A3  
R13  
1k  
B
1/3 LT1399  
R14  
324Ω  
ALL RESISTORS 1%  
= ±5V  
V
S
R15  
324Ω  
1398/99 F09  
Figure 9. Buffered Color-Difference to RGB Matrix  
13