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| 型號： | INA149AIDR |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 7/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP UNITY GAIN DIFF 8SOIC |
| 特色產(chǎn)品： | INA149 Difference Amplifier |
| 標準包裝： | 1 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 5 V/µs |
| -3db帶寬： | 500kHz |
| 電壓 - 輸入偏移： | 350µV |
| 電流 - 電源： | 810µA |
| 電流 - 輸出 / 通道： | 25mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 36 V，±2 V ~ 18 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SOIC |
| 包裝： | 標準包裝 |
| 其它名稱： | 296-30028-6 |
+
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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相關代理商/技術(shù)參數(shù) |
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| INA149AMDREP | 功能描述:差分放大器 EP High Common Mode Vltg Diff Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
| INA149-EP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH COMMON-MODE VOLTAGE DIFFERENCE AMPLIFIER |
| INA149EVM | 功能描述:放大器 IC 開發(fā)工具 INA149 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| INA152 | 制造商:BB 制造商全稱: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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