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INA214AIDCKT Datasheet(PDF) 9 Page - Texas Instruments |
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INA214AIDCKT Datasheet(HTML) 9 Page - Texas Instruments |
9 / 17 page INPUT FILTERING SHUTTING DOWN THE INA210-INA214 f - 3dB = f - 3dB 1 2p (2 R )C FILTER FILTER LOAD V SUPPLY R SHUNT << RFILTER R <10W FILTER C FILTER R <10W FILTER V+ OUT Output GND IN- IN+ INA21x Reference Voltage C BYPASS 0.01 F m to 0.1 F m +2.7Vto+26V REF R 1 R 3 R 2 R 4 INA21x V+ OUT GND IN- IN+ PRODUCT R andR 3 4 INA210 INA211 INA212 INA213 INA214 5kW 2kW 1kW 20kW 10kW C BYPASS NOTE:1M pathsfromshuntinputstoreferenceandINA21xoutputs. W Shutdown Control REF Reference Voltage 1MW R 3 R 2 R 4 Supply Load R SHUNT Output GainError%=100 [100 {R/(R+R )}] - FILT ´ (1) INA210 ,, INA211 INA212, INA213 INA214 www.ti.com............................................................................................................................................................... SBOS437A – MAY 2008 – REVISED JUNE 2008 SERIES An obvious and straightforward location for filtering is at the output of the INA210-INA214; however, this While the INA210-INA214 series does not have a location negates the advantage of the low output shutdown pin, its low power consumption allows impedance of the internal buffer. The only other powering from the output of a logic gate or transistor option for filtering is at the input pins of the switch that can turn on and turn off the INA210-INA214; this location requires consideration INA210-INA214 power-supply quiescent current. of the ±30% tolerance of the input impedance. However, in current shunt monitoring applications. Figure 24 shows a filter placed at the input pins. there is also a concern for how much current is drained from the shunt circuit in shutdown conditions. Evaluating this current drain involves considering the simplified schematic of the INA210-INA214 in shutdown mode shown in Figure 25. Figure 24. Input Filter Using the lowest possible resistor values minimizes both the initial shift in gain and effects of tolerance. Figure 25. Basic Circuit for Shutting Down The effect on initial gain is given by Equation 1: INA210-INA214 with Grounded Reference Note that there is typically slightly more than 1M Ω Where R is the value for R3 or R4 from Table 1 for the impedance (from the combination of 1M Ω feedback model is in question. and 5k Ω input resistors) from each input of the INA210-INA214 to the OUT pin and to the REF pin. Table 1. The amount of current flowing through these pins PRODUCT GAIN R3 AND R4 depends on the respective ultimate connection. For INA210 200 5k Ω example, if the REF pin is grounded, the calculation INA211 500 2k Ω of the effect of the 1M Ω impedance from the shunt to ground is straightforward. However, if the reference INA212 1000 1k Ω or op amp is powered while the INA210-INA214 is INA213 50 20k Ω shut down, the calculation is direct; instead of INA214 100 10k Ω assuming 1M Ω to ground, however, assume 1MΩ to the reference voltage. If the reference or op amp is Using an INA212, for example, the total effect on gain also shut down, some knowledge of the reference or error can be calculated by replacing the R with op amp output impedance under shutdown conditions 1k Ω− 30%, (or 700Ω) or 1kΩ+ 30% (or 1.3kΩ). The is required. For instance, if the reference source tolerance extremes of RFILT can also be inserted into behaves as an open circuit when it is unpowered, the equation. If a pair of 100 Ω, 1% resistors are used little or no current flows through the 1M Ω path. on the inputs, the initial gain error is approximately 2%. Regarding the 1M Ω path to the output pin, the output stage of a disabled INA210-INA214 does constitute a good path to ground; consequently, this current is directly proportional to a shunt common-mode voltage impressed across a 1M Ω resistor. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): INA210 INA211 INA212 INA213 INA214 |
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