参数资料
| 型号： | INA149AIDR |
| 厂商： | Texas Instruments |
| 文件页数： | 9/26页 |
| 文件大小： | 0K |
| 描述： | IC AMP UNITY GAIN DIFF 8SOIC |
| 特色产品： | INA149 Difference Amplifier |
| 标准包装： | 1 |
| 放大器类型： | 差分 |
| 电路数： | 1 |
| 转换速率： | 5 V/µs |
| -3db带宽： | 500kHz |
| 电压 - 输入偏移： | 350µV |
| 电流 - 电源： | 810µA |
| 电流 - 输出 / 通道： | 25mA |
| 电压 - 电源，单路/双路(±)： | 4 V ~ 36 V，±2 V ~ 18 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 标准包装 |
| 其它名称： | 296-30028-6 |
+
20 k
380 k
19 k
V = 15 V
V+ = +15 V
4
7
2
3
1
6
5
VOUT
RS = 10
VCM = 265 V
RC = 10
(1)
IMAX = 1 A
SBOS579B – SEPTEMBER 2011 – REVISED JULY 2012
ERROR BUDGET ANALYSIS
The following error budget analysis demonstrates the importance of a high common-mode rejection ratio when
measuring small differential signals in the presence of high common-mode voltages. Figure 48 shows a typical
current measurement application.
Figure 48. Typical Current Measurement Application
The maximum current through the shunt resistor (RS) is 1 A and generates a full-scale voltage drop of 10 V. All
error sources in this calculation are shown in relation to this full-scale voltage. The common-mode voltage in this
scenario is 265 V and the temperature range is from room temperature (+25°C) to +85°C. Table 2 shows the
dominant error sources for the INA149 and a competitor device.
Table 2. Error Budget Analysis
ERROR (ppm of FS)
ERROR
SOURCE
INA149
COMPETIOR A
INA149
COMPETITOR A
Accuracy, TA = +25°C
Initial gain error
0.02% FS
0.05% FS
200
500
Offset voltage
1100 V
1000 V
110
100
Common mode
265 V/90 dB = 8380 V
265 V/77 dB = 37432 V
838
3743
Total acuracy error
1148
4343
Temperature drift
Gain
10 ppm/°C × 60°C
600
Offset voltage
10 V/°C × 60°C
20 V/°C × 60°C
60
120
Total drift error
660
720
Total error
1808
5063
If a smaller shunt resistor is used, the full-scale voltage drop is also smaller. A shunt resistor of 1
Ω causes a 1-V
voltage drop with a current of 1 A flowing through it. The error of 1808 ppm for a full-scale voltage of 10 V
becomes 18080 ppm (1.6%) for a full-scale voltage of only 1 V.
This example demonstrates that the dominate source of error, even over temperature, comes from the CMRR
specification of the devices. The common-mode error is 46% of the total error for the INA149 and 74% of the
total error for the competitor device.
Copyright 2011–2012, Texas Instruments Incorporated
17
Product Folder Link(s): INA149
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相关代理商/技术参数 |
参数描述 |
|---|---|
| INA149AMDREP | 功能描述:差分放大器 EP High Common Mode Vltg Diff Amp RoHS:否 制造商:Texas Instruments 通道数量:1 Channel 带宽:2.4 GHz 可用增益调整:6 dB to 26 dB 输入补偿电压: 共模抑制比（最小值）:- 40 dB 工作电源电压:4.75 V to 5.25 V 电源电流:100 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:WQFN-24 封装:Reel |
| INA149-EP | 制造商:TI 制造商全称:Texas Instruments 功能描述:HIGH COMMON-MODE VOLTAGE DIFFERENCE AMPLIFIER |
| INA149EVM | 功能描述:放大器 IC 开发工具 INA149 Eval Mod RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| INA152 | 制造商:BB 制造商全称:BB 功能描述:Single-Supply DIFFERENCE AMPLIFIER |
| INA152EA | 制造商:Texas Instruments 功能描述:IC AMP DIFF SMD VSSOP8 152 |
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