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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  
U
O
TYPICAL APPLICATI  
Single Supply RGB Video Amplifier  
input. Assuming a 75source impedance for the signal  
driving VIN, the Thevenin equivalent signal arriving at  
A1’s positive input is 3V + 0.4VIN, with a source imped-  
ance of 714. The combination of these two inputs gives  
anoutputatthecathodeofD2of2•VIN withnoadditional  
DC offset. The 75back termination resistor R9 halves  
the signal again such that VOUT equals a buffered version  
of VIN.  
The LT1395 can be used with a single supply voltage of  
6V or more to drive ground-referenced RGB video. In  
Figure6,two1N4148diodesD1andD2havebeenplaced  
in series with the output of the LT1395 amplifier A1 but  
within the feedback loop formed by resistor R8. These  
diodes effectively level-shift A1’s output downward by 2  
diodes, allowing the circuit output to swing to ground.  
It is important to note that the 4.7µF capacitor C1 has  
been added to provide enough current to maintain the  
voltage drop across diodes D1 and D2 when the circuit  
outputdropslowenoughthatthediodesmightotherwise  
turn off. This means that this circuit works fine for  
continuousvideoinput, butwillrequirethatC1chargeup  
after a period of inactivity at the input.  
Amplifier A1 is used in a positive gain configuration. The  
feedbackresistorR8is255.Thegainresistoriscreated  
from the parallel combination of R6 and R7, giving a  
Thevenin equivalent 63.5connected to 3.75V. This  
gives an AC gain of +5 from the noninverting input of  
amplifier A1 to the cathode of D2. However, the video  
input is also attenuated before arriving at A1’s positive  
5V  
C1  
4.7µF  
V
S
R1  
R6  
84.5  
6V TO 12V  
1000Ω  
D1  
D2  
R9  
75Ω  
+
V
OUT  
1N4148 1N4148  
A1  
LT1395  
R2  
1300Ω  
R3  
160Ω  
R8  
255Ω  
V
IN  
1395/6/7 TA03  
R4  
75Ω  
R7  
255Ω  
R5  
2.32Ω  
Figure 6. Single Supply RGB Video Amplifier (1 of 4 Channels)  
RELATED PARTS  
PART NUMBER  
LT1227/LT1229/LT1230  
LT1252/LT1253/LT1254  
LT1363/LT1364/LT1365  
LT1398/LT1399  
LT1675  
DESCRIPTION  
COMMENTS  
140MHz Single/Dual/Quad Current Feedback Amplifier 1100V/µs Slew Rate, Single Adds Shutdown Pin  
Low Cost Video Amplifiers  
Single, Dual and Quad 100MHz Current Feedback Amplifiers  
1000V/µs Slew Rate, Voltage Feedback  
70MHz Single/Dual/Quad Op Amps  
Dual/Triple Current Feedback Amplifiers  
Triple 2:1 Buffered Video Multiplexer  
Low Cost Triple Current Feedback Amplifiers  
300MHz Bandwidth, 0.1dB Flatness > 150MHz with Shutdown  
2.5ns Switching Time, 250MHz Bandwidth  
LT6559  
300MHz Bandwidth, Specified at +5V and ±5V, 3mm × 3mm  
QFN Package  
139567fc  
LT 0207 REV C • PRINTED IN USA  
LinearTechnology Corporation  
1630 McCarthy Blvd., Milpitas, CA 95035-7417  
20  
© LINEAR TECHNOLOGY CORPORATION 1999  
(408) 432-1900 FAX: (408) 434-0507 www.linear.com  
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