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AD627ARZ-REEL PDF预览

AD627ARZ-REEL

更新时间： 2024-02-11 14:38:59
品牌 Logo 应用领域
亚德诺 - ADI 放大器光电二极管
页数 文件大小 规格书
25页 1129K
描述
INSTRUMENTATION AMPLIFIER, 200uV OFFSET-MAX, 0.08MHz BAND WIDTH, PDSO8, MS-012AA, SOIC-8

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AD627ARZ-REEL 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Active零件包装代码：SOIC
包装说明：SOP,针数：8
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.33.00.01风险等级：5.11
放大器类型：INSTRUMENTATION AMPLIFIER最大平均偏置电流 (IIB)：0.01 µA
标称带宽 (3dB)：0.08 MHz最小共模抑制比：77 dB
最大输入失调电流 (IIO)：0.001 µA最大输入失调电压：200 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)：-5 V
最大非线性：0.001%功能数量：1
端子数量：8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封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：260
认证状态：Not Qualified座面最大高度：1.75 mm
标称压摆率：0.05 V/us子类别：Instrumentation Amplifier
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：Matte 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：NOT SPECIFIED最大电压增益：1000
最小电压增益：5标称电压增益：10
宽度：3.9 mmBase Number Matches：1

AD627ARZ-REEL 数据手册

 浏览型号AD627ARZ-REEL的Datasheet PDF文件第17页浏览型号AD627ARZ-REEL的Datasheet PDF文件第18页浏览型号AD627ARZ-REEL的Datasheet PDF文件第19页浏览型号AD627ARZ-REEL的Datasheet PDF文件第21页浏览型号AD627ARZ-REEL的Datasheet PDF文件第22页浏览型号AD627ARZ-REEL的Datasheet PDF文件第23页 
AD627  
ERRORS DUE TO AC CMRR  
GROUND RETURNS FOR INPUT BIAS CURRENTS  
In Table 9, the error due to common-mode rejection results  
from the common-mode voltage from the bridge 2.5 V. The  
ac error due to less than ideal common-mode rejection cannot  
be calculated without knowing the size of the ac common-mode  
voltage (usually interference from 50 Hz/60 Hz mains frequenciesꢀ.  
Input bias currents are dc currents that must flow to bias the  
input transistors of an amplifier. They are usually transistor base  
currents. When amplifying floating input sources, such as  
transformers or ac-coupled sources, there must be a direct dc  
path into each input so that the bias current can flow. Figure 44,  
Figure 45, and Figure 46 show how to provide a bias current  
path for the cases of, respectively, transformer coupling, a  
thermocouple application, and capacitive ac-coupling.  
A mismatch of 0.±% between the four gain setting resistors  
determines the low frequency CMRR of a two-op-amp  
instrumentation amplifier. The plot in Figure 43 shows the  
practical results of resistor mismatch at ambient temperature.  
In dc-coupled resistive bridge applications, providing this path  
is generally not necessary because the bias current simply flows  
from the bridge supply through the bridge and into the amplifier.  
However, if the impedance that the two inputs see are large, and  
differ by a large amount (>±0 kΩꢀ, the offset current of the input  
stage causes dc errors compatible with the input offset voltage of  
the amplifier.  
The CMRR of the circuit in Figure 42 (Gain = +±±ꢀ was  
measured using four resistors with a mismatch of nearly 0.±%  
(R± = 9999.5 Ω, R2 = 999.76 Ω, R3 = ±000.2 Ω, R4 = 9997.7 Ωꢀ.  
As expected, the CMRR at dc was measured at about 14 dB  
(calculated value is 15 dBꢀ. However, as frequency increases,  
CMRR quickly degrades. For example, a 200 mV p-p harmonic  
of the mains frequency at ±10 Hz would result in an output  
voltage of about 100 μV. To put this in context, a ±2-bit data  
acquisition system, with an input range of 0 V to 2.5 V, has an  
LSB weighting of 6±0 μV.  
+V  
S
–INPUT  
2
1
7
R
G
6
V
OUT  
AD627  
5
8
3
+INPUT  
REFERENCE  
4
By contrast, the AD627 uses precision laser trimming of internal  
resistors, along with patented CMR trimming, to yield a higher  
dc CMRR and a wider bandwidth over which the CMRR is flat  
(see Figure 23ꢀ.  
LOAD  
–V  
S
TO POWER  
SUPPLY  
GROUND  
Figure 44. Ground Returns for Bias Currents with Transformer Coupled Inputs  
+5V  
+V  
S
–INPUT  
2
1
7
A2  
VIN–  
VIN+  
1/2  
OP296  
R
G
6
V
OUT  
AD627  
V
OUT  
5
A1  
8
3
+INPUT  
1/2  
REFERENCE  
4
OP296  
LOAD  
–V  
S
TO POWER  
SUPPLY  
GROUND  
–5V  
R2  
R1  
R3  
1000.2Ω  
R4  
9997.7Ω  
9999.5Ω 999.76Ω  
Figure 4±. Ground Returns for Bias Currents with Thermocouple Inputs  
+V  
S
–INPUT  
Figure 42. 0.1% Resistor Mismatch Example  
2
1
7
120  
R
G
6
V
OUT  
AD627  
110  
100  
90  
5
8
3
+INPUT  
REFERENCE  
4
LOAD  
100kΩ  
–V  
S
TO POWER  
SUPPLY  
GROUND  
80  
70  
60  
50  
40  
Figure 46. Ground Returns for Bias Currents with AC-Coupled Inputs  
30  
20  
1
10  
100  
1k  
10k  
100k  
FREQUENCY (Hz)  
Figure 43. CMRR over Frequency of Discrete In-Amp in Figure 42  
Rev. D | Page 19 of 24  
 
 
 
 
 
 
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