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INA117P

更新时间： 2024-02-09 08:34:52
品牌 Logo 应用领域
BB 运算放大器放大器电路光电二极管
页数 文件大小 规格书
14页 194K
描述
High Common-Mode Voltage DIFFERENCE AMPLIFIER

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中文翻译

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INA117P 技术参数

生命周期：Obsolete包装说明：GREEN, METAL, TO-99, 8 PIN
Reach Compliance Code：unknown风险等级：5.66
Is Samacsys：N放大器类型：OPERATIONAL AMPLIFIER
标称共模抑制比：80 dB最大输入失调电压：1000 µV
JESD-30 代码：O-MBCY-W8JESD-609代码：e4
功能数量：1端子数量：8
最高工作温度：125 °C最低工作温度：-55 °C
封装主体材料：METAL封装代码：TO-99
封装形状：ROUND封装形式：CYLINDRICAL
峰值回流温度（摄氏度）：NOT SPECIFIED认证状态：Not Qualified
标称压摆率：2.6 V/us供电电压上限：22 V
标称供电电压 (Vsup)：15 V表面贴装：NO
温度等级：MILITARY端子面层：GOLD
端子形式：WIRE端子位置：BOTTOM
处于峰值回流温度下的最长时间：NOT SPECIFIEDBase Number Matches：1

INA117P 数据手册

 浏览型号INA117P的Datasheet PDF文件第6页浏览型号INA117P的Datasheet PDF文件第7页浏览型号INA117P的Datasheet PDF文件第8页浏览型号INA117P的Datasheet PDF文件第10页浏览型号INA117P的Datasheet PDF文件第11页浏览型号INA117P的Datasheet PDF文件第12页 
In all cases, the sense resistor imbalances the input resistor  
matching of the INA117, degrading its CMR. Also, the input  
impedance of the INA117 loads RS, causing gain error in the  
voltage-to-current conversion. Both of these errors can be  
easily corrected.  
Example: For a 1V/mA transfer function, the nominal,  
uncorrected value for RS would be 1kΩ. A slightly larger  
value, RS' = 1002.6Ω, compensates for the gain error due to  
loading.  
The 380kΩ term in the equation for RS' has a tolerance of  
±25%, so sense resistors above approximately 400Ω may  
require trimming to achieve gain accuracy better than 0.02%.  
The CMR error can be corrected with the addition of a  
compensation resistor, RC, equal in value to RS as shown in  
Figures 4, 5, and 6. If RS is less than 20Ω, the degradation  
in CMR is negligible and RC can be omitted. If RS is larger  
than approximately 2kΩ, trimming RC may be required to  
achieve greater than 86dB CMR. This is because the actual  
INA117 input impedances have 1% typical mismatch.  
Of course, if a buffer amplifier is added as shown in Figure  
7, both inputs see a low source impedance, and the sense  
resistor is not loaded. As a result, there is no gain error or  
CMR degradation. The buffer amplifier can operate as a  
unity gain buffer or as an amplifier with non-inverting gain.  
Gain added ahead of the INA117 improves both CMR and  
signal-to-noise. Added gain also allows a lower voltage drop  
across the sense resistor. The OPA1013 is a good choice for  
the buffer amplifier since both its input and output can swing  
close to its negative power supply.  
If RS is more than approximately 100Ω, the gain error will  
be greater than the 0.02% specification of the INA117. This  
gain error can be corrected by slightly increasing the value  
of RS. The corrected value, RS', can be calculated by—  
RS • 380kΩ  
RS' = ——————  
380kΩ – RS  
–15V  
+15V  
7
V1  
4
I
380kΩ  
380kΩ  
2
3
VX  
V1  
–21V to +10V  
–5V to –36V  
–20V to –51V  
+15V  
Ground  
–15V  
R2*  
RS  
6
380kΩ  
R2  
R1  
VO = I • RS • (1 +  
)
1/2  
OPA1013  
21.1kΩ  
20kΩ  
R1 *  
8
1
5
*Or connect as buffer (R2 = 0, omit R1).  
–VX  
Regulated power for op amp allows –VX  
power to vary over wide range.  
Op amp power can be derived with voltage-  
dropping zener diode if –VX power is relatively  
constant.  
180k Ω  
V
X = –30V to –200V  
VZ  
MPS-A42  
|VX| = (5V to 36V) + VZ  
e.g., If VZ is 50V then VX = –55V to –86V.  
0.01µF  
IN4702  
or  
–VX  
V–  
V+  
7
4
380kΩ  
380kΩ  
2
3
I
RS  
6
380kΩ  
V
O = I • RS  
1/2  
OPA1013  
21.1kΩ  
20kΩ  
0.1µF  
8
1
5
–VX  
FIGURE 7. Current Sensing with Input Buffer.  
®
9
INA117  
1...6789101112...14

中文翻译

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