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14692 参数 Datasheet PDF下载

14692图片预览
型号: 14692
PDF下载: 下载PDF文件 查看货源
内容描述: 200MHz的双通道, 30V /μs的16位精度的AV ≥ 2运算放大器 [Dual 200MHz, 30V/μs 16-Bit Accurate AV ≥ 2 Op Amp]
分类和应用: 运算放大器
文件页数/大小: 12 页 / 190 K
品牌: Linear [ Linear ]
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LT1469-2  
APPLICATIONS INFORMATION  
Input Considerations  
The input bias currents vary with common mode voltage.  
The cancellation circuitry was not designed to track this  
common mode voltage because the settling time would  
have been adversely affected.  
Each input of the LT1469 is protected with a 100Ω series  
resistor and back-to-back diodes across the bases of  
the input devices. If large differential input voltages are  
anticipated, limit the input current to less than 10mA with  
an external series resistor. Each input also has two ESD  
clamp diodes—one to each supply. If an input is driven  
beyond the supply, limit the current with an external resis-  
tor to less than 10mA.  
The LT1469 inputs can be driven to the negative supply  
and to within 0.±5 of the positive supply without phase  
reversal. As the input moves closer than 0.±5 to the posi-  
tive supply, the output reverses phase.  
Total Input Noise  
TheLT1469employsbiascurrentcancellationattheinputs.  
The inverting input current is trimmed at zero common  
mode voltage to minimize errors in inverting applications  
such as I-to-5 converters. The noninverting input current  
is not trimmed and has a wider variation and therefore a  
larger maximum value. As the input offset current can be  
greaterthaneitherinputcurrent,theuseofbalancedsource  
resistance is NOT recommended as it actually degrades  
DC accuracy and also increases noise.  
ThetotalinputnoiseoftheLT1469isoptimizedforasource  
resistance between 1k and 20k. Within this range, the  
total input noise is dominated by the noise of the source  
resistance itself. When the source resistance is below  
1k, voltage noise of the amplifier dominates. When the  
source resistance is above 20k, the input noise current is  
the dominant contributor.  
SIMPLIFIED SCHEMATIC  
+
5
I1  
I2  
I±  
Q10  
Qꢂ  
Q9  
OUT  
+IN  
Q1  
Q2  
ꢀIN Q±  
Q3  
Q6  
Q7  
Q11  
Q4  
C
BIAS  
I3  
I4  
I6  
5
14692 SS  
14692f  
10