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AD8571ARMZ

更新时间： 2024-02-15 21:10:20
品牌 Logo 应用领域
罗彻斯特 - ROCHESTER 放大器PC光电二极管
页数 文件大小 规格书
25页 1423K
描述
OP-AMP, 10 uV OFFSET-MAX, 1.5 MHz BAND WIDTH, PDSO8, ROHS COMPLIANT, MO-187AA, MSOP-8

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AD8571ARMZ 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：TSSOP
包装说明：TSSOP,针数：8
Reach Compliance Code：unknown风险等级：5.58
Is Samacsys：N放大器类型：OPERATIONAL AMPLIFIER
最大平均偏置电流 (IIB)：0.0015 µA标称共模抑制比：130 dB
最大输入失调电压：10 µVJESD-30 代码：S-PDSO-G8
JESD-609代码：e3长度：3 mm
湿度敏感等级：1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：TSSOP封装形状：SQUARE
封装形式：SMALL OUTLINE, THIN PROFILE, SHRINK PITCH峰值回流温度（摄氏度）：260
座面最大高度：1.1 mm标称压摆率：0.4 V/us
子类别：Operational Amplifier供电电压上限：6 V
标称供电电压 (Vsup)：5 V表面贴装：YES
技术：CMOS温度等级：AUTOMOTIVE
端子面层：MATTE TIN端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED标称均一增益带宽：1500 kHz
宽度：3 mmBase Number Matches：1

AD8571ARMZ 数据手册

 浏览型号AD8571ARMZ的Datasheet PDF文件第18页浏览型号AD8571ARMZ的Datasheet PDF文件第19页浏览型号AD8571ARMZ的Datasheet PDF文件第20页浏览型号AD8571ARMZ的Datasheet PDF文件第22页浏览型号AD8571ARMZ的Datasheet PDF文件第23页浏览型号AD8571ARMZ的Datasheet PDF文件第24页 
AD8571/AD8572/AD8574  
APPLICATIONS INFORMATION  
R2  
5 V PRECISION STRAIN GAGE CIRCUIT  
R1  
R3  
The extremely low offset voltage of the AD8572 makes it an ideal  
amplifier for any application requiring accuracy with high gains,  
such as a weigh scale or strain gage. Figure 63 shows a configura-  
tion for a single-supply, precision strain gage measurement system.  
V2  
V1  
V
OUT  
AD8571/  
AD8572/  
AD8574  
R4  
R4  
R3  
R2  
R2  
IF  
=
, THEN V  
=
(V1 – V2)  
OUT  
R1  
R1  
The REF192 provides a 2.5 V precision reference voltage for A2.  
The A2 amplifier boosts this voltage to provide a 4.0 V reference  
for the top of the strain gage resistor bridge. Q1 provides the  
current drive for the 350 Ω bridge network. A1 is used to amplify  
the output of the bridge with the full-scale output voltage equal to  
Figure 64. Using the AD857x as a Difference Amplifier  
In an ideal difference amplifier, the ratio of the resistors is set  
equal to  
R2 R4  
R1 R3  
AV  
=
=
(19)  
2 ×  
(
R1 + R2  
)
(17)  
RB  
Set the output voltage of the system to  
OUT = AV (V1 − V2)  
where RB is the resistance of the load cell.  
V
(20)  
Using the values given in Figure 63, the output voltage linearly  
varies from 0 V with no strain to 4 V under full strain.  
Due to finite component tolerance, the ratio between the four  
resistors is not exactly equal, and any mismatch results in a  
reduction of common-mode rejection from the system. Referring  
to Figure 64, the exact common-mode rejection ratio can be  
expressed as  
2
5V  
3
6
2.5V  
REF192  
4
1kΩ  
Q1  
2N2222  
A2  
OR  
AD8572-B  
EQUIVALENT  
R1R4 + 2R2R4 + R2R3  
12kΩ  
20kΩ  
CMRR =  
(21)  
4.0V  
2R1R4 − 2R2R3  
R2  
R1  
100Ω  
17.4kΩ  
In the 3-op amp instrumentation amplifier configuration shown  
in Figure 65, the output difference amplifier is set to unity gain  
with all four resistors equal in value. If the tolerance of the  
resistors used in the circuit is given as δ, the worst-case CMRR  
of the instrumentation amplifier is  
40mV  
V
A1  
OUT  
FULL-SCALE  
350Ω  
LOAD  
CELL  
0V TO 4V  
AD8572-A  
R4  
R3  
100Ω  
17.4kΩ  
NOTE:  
1
USE 0.1% TOLERANCE RESISTORS.  
CMRRMIN  
=
(22)  
2δ  
Figure 63. 5 V Precision Strain Gage Amplifier  
AD8574-A  
V2  
R
3 V INSTRUMENTATION AMPLIFIER  
The high common-mode rejection, high open-loop gain,  
and operation down to 3 V of the supply voltage make the  
AD857x family an excellent op amp choice for discrete single-  
supply instrumentation amplifiers. The common-mode  
rejection ratio of the AD857x is greater than 120 dB, but the  
CMRR of the system is also a function of the external resistor  
tolerances. The gain of the difference amplifier shown in Figure 64  
is given as  
R
R
R
R
V
R
OUT  
G
AD8574-C  
R
R
TRIM  
V1  
AD8574-B  
2R  
(V1 – V2)  
V
= 1 +  
OUT  
R
G
Figure 65. Discrete Instrumentation Amplifier Configuration  
⎛
⎜
R4 ⎞⎛  
R1 ⎞  
R2  
⎠
⎛ R2 ⎞  
R1  
VOUT = V1  
1 +  
− V 2  
(18)  
⎟⎜  
⎟
⎜
⎝
⎟
⎠
Therefore, using 1% tolerance resistors results in a worst-case  
system CMRR of 0.02, or 34 dB. To achieve high common-  
mode rejection, either high precision resistors or an additional  
trimming resistor, as shown in Figure 65, should be used. The  
value of this trimming resistor should be equal to the value of R  
multiplied by its tolerance. For example, using 10 kΩ resistors  
with 1% tolerance would require a series trimming resistor  
equal to 100 Ω.  
R3 + R4  
⎝
⎠⎝  
Rev. E | Page 20 of 24  
 
 
 
 
 
 
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