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AD620 PDF预览

AD620

更新时间: 2024-01-31 16:10:35
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
16页 562K
描述
Low Cost, Low Power Instrumentation Amplifier

AD620 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:DIP
包装说明:ROHS COMPLIANT, MS-021-AA, SOIC-8针数:8
Reach Compliance Code:compliantECCN代码:EAR99
HTS代码:8542.31.00.01风险等级:0.66
Is Samacsys:N放大器类型:INSTRUMENTATION AMPLIFIER
最大平均偏置电流 (IIB):0.0015 µA标称带宽 (3dB):1 MHz
最小共模抑制比:86 dB最大输入失调电流 (IIO):0.00075 µA
最大输入失调电压:85 µVJESD-30 代码:R-PDSO-G8
JESD-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:0.004%
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):260
电源:+-15 V认证状态:Not Qualified
座面最大高度:1.75 mm标称压摆率:1.2 V/us
子类别:Instrumentation Amplifier最大压摆率:1.6 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: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:30最大电压增益:10000
最小电压增益:1标称电压增益:10
宽度:3.9 mmBase Number Matches:1

AD620 数据手册

 浏览型号AD620的Datasheet PDF文件第7页浏览型号AD620的Datasheet PDF文件第8页浏览型号AD620的Datasheet PDF文件第9页浏览型号AD620的Datasheet PDF文件第11页浏览型号AD620的Datasheet PDF文件第12页浏览型号AD620的Datasheet PDF文件第13页 
AD620  
20A  
V
B
20A  
I2  
I1  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
A1  
A2  
10k⍀  
C2  
C1  
10k⍀  
10k⍀  
A3  
OUTPUT  
REF  
10k⍀  
+IN  
R3  
400⍀  
R1  
R2  
– IN  
Q1  
Q2  
R4  
400⍀  
R
G
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
GAIN  
SENSE  
GAIN  
SENSE  
–V  
S
Figure 33. Simplified Schematic of AD620  
THEORY OF OPERATION  
Figure 31b. Gain Nonlinearity, G = 100, RL = 10 kΩ  
(100 µV = 10 ppm)  
The AD620 is a monolithic instrumentation amplifier based on  
a modification of the classic three op amp approach. Absolute  
value trimming allows the user to program gain accurately (to  
0.15% at G = 100) with only one resistor. Monolithic construc-  
tion and laser wafer trimming allow the tight matching and  
tracking of circuit components, thus ensuring the high level of  
performance inherent in this circuit.  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
The input transistors Q1 and Q2 provide a single differential-  
pair bipolar input for high precision (Figure 33), yet offer 10×  
lower Input Bias Current thanks to Superβeta processing. Feed-  
back through the Q1-A1-R1 loop and the Q2-A2-R2 loop main-  
tains constant collector current of the input devices Q1, Q2  
thereby impressing the input voltage across the external gain  
setting resistor RG. This creates a differential gain from the  
inputs to the A1/A2 outputs given by G = (R1 + R2)/RG + 1.  
The unity-gain subtracter A3 removes any common-mode sig-  
nal, yielding a single-ended output referred to the REF pin  
potential.  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 31c. Gain Nonlinearity, G = 1000, RL = 10 kΩ  
(1 mV = 100 ppm)  
The value of RG also determines the transconductance of the  
preamp stage. As RG is reduced for larger gains, the transcon-  
ductance increases asymptotically to that of the input transistors.  
This has three important advantages: (a) Open-loop gain is  
boosted for increasing programmed gain, thus reducing gain-  
related errors. (b) The gain-bandwidth product (determined by  
C1, C2 and the preamp transconductance) increases with pro-  
grammed gain, thus optimizing frequency response. (c) The  
input voltage noise is reduced to a value of 9 nV/Hz, deter-  
mined mainly by the collector current and base resistance of the  
input devices.  
1k⍀  
10T  
10k⍀  
10k*  
INPUT  
10V p-p  
100k⍀  
V
OUT  
+V  
7
S
2
11k1k⍀  
100⍀  
1
G=1000  
G=1  
The internal gain resistors, R1 and R2, are trimmed to an abso-  
lute value of 24.7 k, allowing the gain to be programmed  
accurately with a single external resistor.  
AD620  
6
G=10  
G=100  
49.94995.49k⍀  
5
8
3
4
The gain equation is then  
–V  
S
49.4 kΩ  
G =  
+ 1  
*ALL RESISTORS 1% TOLERANCE  
RG  
Figure 32. Settling Time Test Circuit  
so that  
49.4 kΩ  
G 1  
RG  
=
–10–  
REV. E  

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