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AD817AREEL 参数 Datasheet PDF下载

AD817AREEL图片预览
型号: AD817AREEL
PDF下载: 下载PDF文件 查看货源
内容描述: [IC OP-AMP, 4000 uV OFFSET-MAX, 50 MHz BAND WIDTH, PDSO8, PLASTIC, SOIC-8, Operational Amplifier]
分类和应用: 放大器光电二极管
文件页数/大小: 12 页 / 212 K
品牌: ADI [ ADI ]
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AD817  
+V  
A H IGH P ERFO RMANCE AD C INP UT BUFFER  
High performance analog to digital converters (ADCs) require  
input buffers with correspondingly high bandwidths and very  
low levels of distortion. T ypical requirements include distortion  
levels of –60 dB to –70 dB for a 1 volt p-p signal and band-  
widths of 10 MHz or more. In addition, an ADC buffer may  
need to drive very large capacitive loads.  
S
R3  
1kΩ  
3.3µF  
SELECT C1, R1, R2 & R3  
FOR DESIRED LOW  
FREQUENCY CORNER.  
(R2 = R1 + R3)  
C2  
0.1µF  
0.01µF  
R1  
9kΩ  
T he circuit of Figure 36 is useful for driving high speed convert-  
ers such as the differential input of the AD733, 10-bit ADC.  
T his circuit may be used with other converters with only minor  
modifications. Using the AD817 provides the user with the op-  
tion of either operating the buffer in differential mode or from a  
single +5 volt supply. Operating from a +5 volt power supply  
helps to avoid overdriving the ADCa common problem with  
buffers operating at higher supply voltages.  
7
C
OUT  
2
3
C1  
0.1µF  
6
V
AD817  
OUT  
V
R
150Ω  
IN  
L
4
C
L
200pF  
R2  
10kΩ  
C3  
0.1µF  
Figure 37. Single Supply Am plifier Configuration  
SINGLE SUP P LY O P ERATIO N  
Combining R3 with C2 forms a low-pass filter with a corner  
frequency of 1.5 kHz. T his is needed to maintain amplifier  
PSRR, since the supply is connected to VIN through the input  
divider. T he values for RL and CL were chosen to demonstrate  
the AD817s exceptional output drive capability. In this con-  
figuration, the output is centered around 2.5 V. In order to  
eliminate the static dc current associated with this level, C3 was  
inserted in series with RL.  
Another exciting feature of the AD817 is its ability to perform  
well in a single supply configuration. T he AD817 is ideally  
suited for applications that require low power dissipation and  
high output current and those which need to drive large capaci-  
tive loads, such as high speed buffering and instrumentation.  
Referring to Figure 37, careful consideration should be given to  
the proper selection of component values. T he choices for this  
particular circuit are: R1+ R3//R2 combine with C1 to form a  
low frequency corner of approximately 300 Hz.  
1kΩ  
+V  
S
0.1µF  
1kΩ  
7
2
3
V
AD817  
6
26  
INA  
50Ω  
COAX  
CABLE  
0.1µF  
4
V
IN  
500mVp-p  
MAX  
AD773  
–V  
S
52.5Ω  
10-BIT  
18MHz  
ADC  
+V  
S
0.1µF  
7
3
2
AD817  
6
27 V  
INB  
1kΩ  
0.1µF  
4
+V  
+5V  
COMMON  
–5V  
S
–V  
S
100µF  
25V  
ADREF43  
VOLTAGE  
REFERENCE  
+2.5V  
1kΩ  
100µF  
25V  
–V  
S
Figure 36. A Differential Input Buffer for High Bandwidth ADCs  
REV. B  
–11–  
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