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5962-8964501PA 参数 Datasheet PDF下载

5962-8964501PA图片预览
型号: 5962-8964501PA
PDF下载: 下载PDF文件 查看货源
内容描述: 精密, 16 MHz的CBFET运算放大器 [Precision, 16 MHz CBFET Op Amp]
分类和应用: 运算放大器放大器电路
文件页数/大小: 8 页 / 237 K
品牌: ADI [ ADI ]
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AD845  
Figure 28b. Settling Tim e of the Three Op Am p Instru-  
m entation Am plifier. Horizontal Scale: 200 ns/Div; Vertical  
Scale, Negative Pulse Input: 5 V/ Div; Output Settling:  
1 m V/Div  
Figure 28a. Settling Tim e of the Three Op Am p Instru-  
m entation Am plifier. Horizontal Scale: 200 ns/Div; Vertical  
Scale, Positive Pulse Input: 5 V/Div; Output Settling:  
1 m V/Div  
AD845 is ideally suited to drive high resolution A/D converters  
with 5 µs on longer conversion times since it offers both wide  
bandwidth and high open-loop gain.  
D RIVING TH E ANALO G INP UT O F AN A/D CO NVERTER  
An op amp driving the analog input of an A/D converter, such  
as that shown in Figure 29, must be capable of maintaining a  
constant output voltage under dynamically changing load condi-  
tions. In successive approximation converters, the input current  
is compared to a series of switched trial currents. T he compari-  
son point is diode clamped but may deviate several hundred  
millivolts resulting in high frequency modulation of A/D input  
current. T he output impedance of a feedback amplifier is made  
artificially low by the loop gain. At high frequencies, where the  
loop gain is low, the amplifier output impedance can approach  
its open-loop value. Most IC amplifiers exhibit a minimum  
open-loop output impedance of 25 due to current limiting re-  
sistors. A few hundred microamps reflected from the change in  
converter loading can introduce errors in instantaneous input  
voltage. If the A/D conversion speed is not excessive and the  
bandwidth of the amplifier is sufficient, the amplifier’s output  
will return to the nominal value before the converter makes its  
comparison. However, many amplifiers have relatively narrow  
bandwidth yielding slow recovery from output transients. T he  
Figure 29. AD845 As ADC Unity Gain Buffer  
O UTLINE D IMENSIO NS  
D imensions shown in inches and (mm).  
Mini-D IP (N) P ackage  
Cerdip (Q) P ackage  
–8–  
REV. D