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INA253 데이터시트(Datasheet) 15 Page - TI store

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부품명 INA253
상세내용  High Voltage, Bidirectional, Zero-Drift, Current-Shunt Monitor with Integrated 2-mΩ Precision Low Inductive Shunt Resistor
PDF  24 Pages
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 15 page
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S
3000
Gain Error Factor
R
3000
Gain Error (%) = 100
(100
Gain Error Factor)
-
´
Differential Input Voltage (V)
0
0.2
0.4
0.6
0.8
1
-100
-50
0
50
100
150
200
250
IB+
IB-
15
INA253
www.ti.com
SLOS954 – MAY 2018
Product Folder Links: INA253
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
Application Information (continued)
Figure 12. Input Bias Current vs Differential Input Voltage
The measurement error expected from the additional external filter resistors can be calculated using Equation 1,
where the gain error factor is calculated using Equation 2.
(1)
The gain error factor, shown in Equation 1, can be calculated to determine the gain error introduced by the
additional external series resistance. Equation 1 calculates the deviation of the shunt voltage resulting from the
attenuation and imbalance created by the added external filter resistance. Table 1 provides the gain error factor
and gain error for several resistor values.
Where:
RS is the external filter resistance value
(2)
Table 1. Gain Error Factor and Gain Error For External Input Resistors
EXTERNAL RESISTANCE (Ω)
GAIN ERROR FACTOR
GAIN ERROR (%)
5
0.998
0.17
10
0.997
0.33
100
0.968
3.23




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