参数资料
| 型号： | INA149AID |
| 厂商： | Texas Instruments |
| 文件页数： | 7/26页 |
| 文件大小： | 0K |
| 描述： | IC AMP UNITY GAIN DIFF 8SOIC |
| 标准包装： | 75 |
| 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： | 管件 |
| 其它名称： | 296-33286-5 INA149AID-ND |
+
20 k
380 k
19 k
V
V+
4
7
2
3
1
6
5
VO = RS × IDUT+
RS
Device
Under
Test
IDUT+
(+275 V max)
+VS
+
20 k
380 k
19 k
V
V+
4
7
2
3
1
6
5
RS
RC
(1)
IDUT
VS
(275 V max)
VO = RS × IDUT
RC
(1)
SBOS579B – SEPTEMBER 2011 – REVISED JULY 2012
MEASURING CURRENT
The INA149 can be used to measure a current by sensing the voltage drop across a series resistor, RS.
Figure 46 shows the INA149 used to measure the supply currents of a device under test.
The sense resistor imbalances the input resistor matching of the INA149, thus degrading its CMR. Also, the input
impedance of the INA149 loads RS, causing gain error in the voltage-to-current conversion. Both of these errors
can be easily corrected.
The CMR error can be corrected with the addition of a compensation resistor (RC), equal to the value of RS, as
shown in Figure 46. If RS is less than 5 Ω, degradation in the CMR is negligible and RC can be omitted. If RS is
larger than approximately 1 k
Ω, trimming RC may be required to achive greater than 90-dB CMR. This error is
caused by the INA149 input impedance mismatch.
Figure 46. Measuring Supply Currents of a Device Under Test
If RS is more than approximately 50 Ω, the gain error is greater than the 0.02% specification of the INA149. This
gain error can be corrected by slightly increasing the value of RS. The corrected value (RS') can be calculated by
RS' = RS × 380 kΩ/(380 kΩ – RS)
(3)
Example: For a 1-V/mA transfer function, the nominal, uncorrected value for RS would be 1 kΩ. A slightly larger
value (RS' = 1002.6 Ω), compensates for the gain error as a result of loading.
The 380-k
Ω term in the equation for RS' has a tolerance of 25%, thus sense resistors above approximately 400 Ω
may require trimming to achive gain accuracy better than 0.02%.
Copyright 2011–2012, Texas Instruments Incorporated
15
Product Folder Link(s): INA149
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相关代理商/技术参数 |
参数描述 |
|---|---|
| INA149AIDR | 功能描述:差分放大器 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 |
| 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 |
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