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AD8227ARMZ

更新时间： 2024-01-22 06:14:14
品牌 Logo 应用领域
亚德诺 - ADI 仪表放大器放大器电路光电二极管PC
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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AD8227ARMZ 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

AD8227ARMZ 数据手册

 浏览型号AD8227ARMZ的Datasheet PDF文件第17页浏览型号AD8227ARMZ的Datasheet PDF文件第18页浏览型号AD8227ARMZ的Datasheet PDF文件第19页浏览型号AD8227ARMZ的Datasheet PDF文件第21页浏览型号AD8227ARMZ的Datasheet PDF文件第22页浏览型号AD8227ARMZ的Datasheet PDF文件第23页 
AD8227  
Common-Mode Rejection Ratio over Frequency  
REFERENCE TERMINAL  
Poor layout can cause some of the common-mode signals to be  
converted to differential signals before reaching the in-amp.  
Such conversions occur when one input path has a frequency  
response that is different from the other. To keep CMRR over  
frequency high, the input source impedance and capacitance of  
each path should be closely matched. Additional source resis-  
tance in the input path ꢁfor example, for input protection) should  
be placed close to the in-amp inputs, which minimizes the  
interaction of the source resistance with parasitic capacitance  
from the PCB traces.  
The output voltage of the AD8227 is developed with respect to  
the potential on the reference terminal. This is useful when the  
output signal needs to be offset to a precise midsupply level. For  
example, a voltage source can be tied to the REF pin to level-  
shift the output so that the AD8227 can drive a single-supply  
ADC. The REF pin is protected with ESD diodes and should  
not exceed either +ꢀS or −ꢀS by more than 0.3 ꢀ.  
For best performance, source impedance to the REF terminal  
should be kept below 2 ꢂ. As shown in Figure 58, the reference  
terminal, REF, is at one end of a 50 kΩ resistor. Additional imped-  
ance at the REF terminal adds to this 50 kΩ resistor and results  
in amplification of the signal connected to the positive input.  
The amplification from the additional RREF can be calculated as  
follows:  
Parasitic capacitance at the gain setting pins can also affect CMRR  
over frequency. If the board design has a component at the gain  
setting pins ꢁfor example, a switch or jumper), the component  
should be chosen so that the parasitic capacitance is as small as  
possible.  
6ꢁ50 kΩ + RREF)/ꢁ60 kΩ + RREF  
)
Power Supplies  
Only the positive signal path is amplified; the negative path  
is unaffected. This uneven amplification degrades CMRR.  
A stable dc voltage should be used to power the instrumentation  
amplifier. Noise on the supply pins can adversely affect perfor-  
mance. See the PSRR performance curves in Figure 23 and  
Figure 24 for more information.  
INCORRECT  
CORRECT  
A 0.1 μF capacitor should be placed as close as possible to each  
supply pin. As shown in Figure 61, a 10 μF tantalum capacitor  
can be used farther away from the part. In most cases, it can be  
shared by other precision integrated circuits.  
AD8227  
AD8227  
REF  
REF  
V
V
+
+V  
OP1177  
–
S
0.1µF  
10µF  
Figure 59. Driving the Reference Pin  
+IN  
–IN  
INPUT VOLTAGE RANGE  
V
OUT  
R
G
Most instrumentation amplifiers have a very limited output  
voltage swing when the common-mode voltage is near the  
upper or lower limit of the part’s input range. The AD8227 has  
very little of this limitation. See Figure 9 through Figure 16 for  
the input common-mode range vs. output voltage of the part.  
AD8227  
LOAD  
REF  
0.1µF  
10µF  
LAYOUT  
–V  
S
Figure 61. Supply Decoupling, REF, and Output Referred to Local Ground  
To ensure optimum performance of the AD8227 at the PCB  
level, care must be taken in the design of the board layout. The  
pins of the AD8227 are arranged in a logical manner to aid in  
this task.  
References  
The output voltage of the AD8227 is developed with respect to  
the potential on the reference terminal. Care should be taken to  
tie REF to the appropriate local ground.  
1
2
3
4
8
7
6
5
+V  
V
–IN  
S
R
G
OUT  
R
REF  
G
+IN  
–V  
S
AD8227  
TOP VIEW  
(Not to Scale)  
Figure 60. Pinout Diagram  
Rev. 0 | Page 20 of 24  
 
 
 
 
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