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AD8277BRZ-R7 PDF预览

AD8277BRZ-R7

更新时间： 2024-02-13 11:53:28
品牌 Logo 应用领域
亚德诺 - ADI 放大器
页数 文件大小 规格书
20页 537K
描述
Low Power, Wide Supply Range, Low Cost Unity-Gain Difference Amplifiers

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AD8277BRZ-R7 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Active零件包装代码：SOIC
包装说明：SOP, SOP14,.25针数：14
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.33.00.01风险等级：2.36
放大器类型：INSTRUMENTATION AMPLIFIER标称带宽 (3dB)：0.55 MHz
最小共模抑制比：86 dB最大输入失调电压：200 µV
JESD-30 代码：R-PDSO-G14JESD-609代码：e3
长度：8.65 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)：-5 V
最大非线性：0.0005%功能数量：2
端子数量：14最高工作温度：85 °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：SOP14,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：260电源：+-2/+-18/2/36 V
认证状态：Not Qualified座面最大高度：1.75 mm
标称压摆率：1.1 V/us子类别：Instrumentation Amplifier
最大压摆率：0.25 mA供电电压上限：18 V
标称供电电压 (Vsup)：5 V表面贴装：YES
温度等级：INDUSTRIAL端子面层：Tin (Sn)
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：30
宽度：3.9 mmBase Number Matches：1

AD8277BRZ-R7 数据手册

 浏览型号AD8277BRZ-R7的Datasheet PDF文件第14页浏览型号AD8277BRZ-R7的Datasheet PDF文件第15页浏览型号AD8277BRZ-R7的Datasheet PDF文件第16页浏览型号AD8277BRZ-R7的Datasheet PDF文件第17页浏览型号AD8277BRZ-R7的Datasheet PDF文件第19页浏览型号AD8277BRZ-R7的Datasheet PDF文件第20页 
AD8276/AD8277  
resistor is determined by the characteristics of the coupler or  
transformer and desired input voltage ranges to the AD8276.  
Table 8. Low Power Op Amps  
Op Amp (A1, A2) Features  
AD8506  
AD860ꢀ  
AD861ꢀ  
AD866ꢀ  
Dual micropower op amp  
On the voltage monitoring side, potential transformers (PTs)  
are used to provide coupling and galvanic isolation. The PTs  
present a load to the power line and also step down the voltage  
to a measureable level. The AD8276 helps to build a robust  
system because it allows input voltages that are almost double  
its supply voltage, while providing additional input protection  
in the form of the integrated ESD diodes.  
Precision dual micropower op amp  
Low cost CMOS micropower op amp  
Dual precision CMOS micropower op amp  
It is preferable to use dual op amps for the high impedance inputs  
because they have better matched performance and track each  
other over temperature. The AD8276 difference amplifiers  
cancel out common-mode errors from the input op amps, if  
they track each other. The differential gain accuracy of the in-  
amp is proportional to how well the input feedback resistors  
(RF) match each other. The CMRR of the in-amp increases as  
the differential gain is increased (1 + 2RF/RG), but a higher gain  
also reduces the common-mode voltage range. Note that dual  
supplies must be used for proper operation of this configuration.  
Not only does the AD8276 monitor the voltage and currents on  
the power lines, it is able to reject very high common-mode  
voltages that may appear at the inputs. The AD8276 also  
performs the differential-to-single-ended conversion on the  
input voltages. The 80 kΩ differential input impedance that the  
AD8276 presents is high enough that it should not load the  
input signals.  
Refer to A Designer’s Guide to Instrumentation Amplifiers for  
more design ideas and considerations.  
I
SH  
AD8276  
R
RTD  
SH  
V
= I × R  
SH SH  
OUT  
Resistive temperature detectors (RTDs) are often measured  
remotely in industrial control systems. The wire lengths  
needed to connect the RTD to a controller add significant  
cost and resistance errors to the measurement. The AD8276  
difference amplifier is effective in measuring errors caused by  
wire resistance in remote 3-wire RTD systems, allowing the  
user to cancel out the errors introduced by the wires. Its  
excellent gain drift provides accurate measurements and stable  
performance over a wide temperature range.  
Figure 51. AD8276 Monitoring Current Through a Shunt Resistor  
Figure 51 shows how the AD8276 can be used to monitor the  
current through a small shunt resistor. This is useful in power  
critical applications such as motor control (current sense) and  
battery monitoring.  
INSTRUMENTATION AMPLIFIER  
I
EX  
The AD8276/AD8277 can be used as building blocks for a low  
power, low cost instrumentation amplifier. An instrumentation  
amplifier provides high impedance inputs and delivers high  
common-mode rejection. Combining the AD8276 with an  
Analog Devices, Inc. low power amplifier (see Table 8) creates a  
precise, power efficient voltage measurement solution suitable  
for power critical systems.  
R
L1  
V
R
OUT  
T
Σ-Δ  
ADC  
R
R
L2  
L3  
AD8276  
REF  
–IN  
A1  
40kΩ  
Figure 53. 3-Wire RTD Cable Resistance Error Measurement  
R
F
40kΩ  
40kΩ  
R
G
V
OUT  
40kΩ  
AD8276  
R
F
REF  
= (1 + 2R /R ) (V  
IN+  
A2  
+IN  
V
– V )  
IN–  
OUT  
F
G
Figure 52. Low Power Precision Instrumentation Amplifier  
Rev. A | Page 18 of 20  
 
 
 
 
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