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| 型号： | INA149EVM |
| 厂商： | Texas Instruments |
| 文件页数： | 7/26页 |
| 文件大小： | 0K |
| 描述： | EVAL MODULE FOR INA149 |
| 标准包装： | 1 |
| 每 IC 通道数： | 1 - 单 |
| 放大器类型： | 差分 |
| 转换速率： | 5 V/µs |
| -3db带宽： | 500kHz |
| 电流 - 输出 / 通道： | 25mA |
| 工作温度： | -40°C ~ 125°C |
| 电流供应（主 IC）： | 810µA |
| 电压 - 电源，单路/双路(±)： | 4 V ~ 36 V，±2 V ~ 18 V |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | INA149 |
| 其它名称： | 296-30217 INA149EVM-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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