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5962-9063301MCA 参数 Datasheet PDF下载

5962-9063301MCA图片预览
型号: 5962-9063301MCA
PDF下载: 下载PDF文件 查看货源
内容描述: 四路精密,低成本,高速, BiFET运算放大器 [Quad Precision, Low Cost, High Speed, BiFET Op Amp]
分类和应用: 运算放大器放大器电路
文件页数/大小: 14 页 / 454 K
品牌: ADI [ ADI ]
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AD713  
Figure 9. A D/A Converter Circuit for Digital Audio  
Figure 11. The AD713 as an ADC Buffer  
Figure 10. Harmonic Distortion as Frequency for the  
Digital Audio Circuit of Figure 9  
Most IC amplifiers exhibit a minimum open loop output imped-  
ance of 25 , due to current limiting resistors. A few hundred  
microamps reflected from the change in converter loading can  
introduce errors in instantaneous input voltage. If the A/D con-  
version 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 bandwidths, yielding  
slow recovery from output transients. The AD713 is ideally  
suited as a driver for A/D converters since it offers both a wide  
bandwidth and a high open loop gain.  
Driving the Analog Input of an A/D Converter  
An op amp driving the analog input of an A/D converter, such  
as that shown in Figure 11, 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. The compari-  
son point is diode clamped but may vary by several hundred  
millivolts, resulting in high frequency modulation of the A/D  
input current. The output impedance of a feedback amplifier is  
made artificially low by its loop gain. At high frequencies, where  
the loop gain is low, the amplifier output impedance can ap-  
proach its open loop value.  
REV. C  
–9–