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AD8227ARZ

更新时间： 2024-02-11 06:36:55
品牌 Logo 应用领域
亚德诺 - ADI 仪表放大器
页数 文件大小 规格书
24页 521K
描述
Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier

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AD8227ARZ 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：SOIC
包装说明：SOP, SOP8,.25针数：8
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.33.00.01风险等级：5.65
放大器类型：INSTRUMENTATION AMPLIFIER最大平均偏置电流 (IIB)：0.027 µA
标称带宽 (3dB)：0.25 MHz最小共模抑制比：110 dB
最大输入失调电流 (IIO)：0.0015 µA最大输入失调电压：100 µV
JESD-30 代码：R-PDSO-G8JESD-609代码：e3
长度：4.9 mm湿度敏感等级：1
负供电电压上限：-18 V标称负供电电压 (Vsup)：-15 V
最大非线性：0.015%功能数量：1
端子数量：8最高工作温度：125 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装等效代码：SOP8,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：225电源：+-1.5/+-18/2.2/36 V
认证状态：Not Qualified座面最大高度：1.75 mm
标称压摆率：0.8 V/us子类别：Instrumentation Amplifier
最大压摆率：0.6 mA供电电压上限：18 V
标称供电电压 (Vsup)：15 V表面贴装：YES
温度等级：AUTOMOTIVE端子面层：MATTE TIN
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
最大电压增益：1000最小电压增益：5
宽度：3.9 mmBase Number Matches：1

AD8227ARZ 数据手册

 浏览型号AD8227ARZ的Datasheet PDF文件第16页浏览型号AD8227ARZ的Datasheet PDF文件第17页浏览型号AD8227ARZ的Datasheet PDF文件第18页浏览型号AD8227ARZ的Datasheet PDF文件第20页浏览型号AD8227ARZ的Datasheet PDF文件第21页浏览型号AD8227ARZ的Datasheet PDF文件第22页 
AD8227  
THEORY OF OPERATION  
+V  
–V  
+V  
–V  
S
S
R
G
NODE 3  
NODE 4  
R3  
50kΩ  
S
S
R1  
8kΩ  
R2  
8kΩ  
+V  
–V  
S
R4  
10kΩ  
NODE 2  
V
A3  
OUT  
+V  
–V  
NODE 1  
R5  
10kΩ  
S
R6  
50kΩ  
S
ESD AND  
OVERVOLTAGE  
PROTECTION  
ESD AND  
OVERVOLTAGE  
PROTECTION  
REF  
Q1  
Q2  
+IN  
–IN  
A1  
A2  
S
V
R
R
BIAS  
B
B
–V  
DIFFERENCE  
AMPLIFIER STAGE  
S
GAIN STAGE  
Figure 58. Simplified Schematic  
ARCHITECTURE  
GAIN SELECTION  
The AD8227 is based on the classic three op amp topology. This  
topology has two stages: a preamplifier to provide differential  
amplification followed by a difference amplifier that removes  
the common-mode voltage and provides additional amplifica-  
tion. Figure 58 shows a simplified schematic of the AD8227.  
Placing a resistor across the RG terminals sets the gain of the  
AD8227. The gain can be calculated by referring to Table 7 or  
by using the following gain equation:  
80 kΩ  
RG =  
G − 5  
The first stage works as follows. To maintain a constant voltage  
across the bias resistor, RB, Amplifier A1 must keep Node 3 at a  
constant diode drop above the positive input voltage. Similarly,  
Amplifier A2 keeps Node 4 at a constant diode drop above the  
negative input voltage. Therefore, a replica of the differential  
input voltage is placed across the gain setting resistor, RG. The  
current that flows across this resistance must also flow through  
the R1 and R2 resistors, creating a gained differential signal  
between the A2 and A1 outputs. Note that, in addition to a  
gained differential signal, the original common-mode signal,  
shifted a diode drop up, is also still present.  
Table 7. Gains Achieved Using Common Resistor Values  
Standard Table Value of RG  
Calculated Gain  
No resistor  
100 kΩ  
49.9 kΩ  
26.7 kΩ  
20 kΩ  
5
5.8  
6.6  
8
9
16 kΩ  
10  
10 kΩ  
13  
5.36 kΩ  
2 kΩ  
19.9  
45  
The second stage is a difference amplifier, composed of  
Amplifier A3 and the R3 through R6 resistors. This stage  
removes the common-mode signal from the amplified  
differential signal and gains it by 5.  
1.78 kΩ  
1 kΩ  
49.9  
85  
845 Ω  
412 Ω  
162 Ω  
80.6 Ω  
99.7  
199  
499  
998  
The transfer function of the AD8227 is  
V
OUT = G × ꢁVIN+ − VIN−) + VREF  
where:  
The AD8227 defaults to G = 5 when no gain resistor is used.  
The tolerance and gain drift of the RG resistor should be added  
to the specifications of the AD8227 to determine the total gain  
accuracy of the system. When the gain resistor is not used, gain  
error and gain drift are minimal.  
80 kΩ  
G = 5 +  
RG  
Rev. 0 | Page 19 of 24  
 
 
 
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