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INA200AIDR Datasheet(PDF) 12 Page - Texas Instruments |
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INA200AIDR Datasheet(HTML) 12 Page - Texas Instruments |
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12 / 27 page  2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 2 4 6 8 10 12 14 16 18 20 22 V (mV) SENSE 24 INA202V TestedLimit OUT (1) V CM2 V CM1 V CM3 V CM4 V ,V ,andV CM2 CM3 CM4 illustratethevariance fromparttopartoftheV thatcancause CM maximumV withV <20mV. OUT SENSE V testedlimitat OUT V =0mV,0 V £ CM1 SENSE V £ . S NOTE:(1)INA200V TestedLimit=0.4V.INA201V TestedLimit=1V. OUT OUT Ideal GainError%=100 - 5kW 5k +R W FILT 100 ´ INA200 INA201 INA202 SBOS374C – NOVEMBER 2006 – REVISED OCTOBER 2010 www.ti.com series with the inputs since the internal gain resistors can vary up to ±30%. (If gain accuracy is not important, then resistors can be added in series with the INA200, INA201, and INA202 inputs with two equal resistors on each input.) OUTPUT VOLTAGE RANGE The output of the INA200, INA201, and INA202 is accurate within the output voltage swing range set by the power supply pin, V+. This performance is best illustrated when using the INA202 (a gain of 100 version), where a 100mV full-scale input from the shunt resistor requires an output voltage swing of +10V, and a power-supply voltage sufficient to achieve +10V on the output. INPUT FILTERING Figure 28. Example for Low VSENSE Case 2 (INA202, Gain = 100) An obvious and straightforward location for filtering is at the output of the INA200, INA201, and INA202 series; however, this location negates the advantage SELECTING RS of the low output impedance of the internal buffer. The only other option for filtering is at the input pins The value chosen for the shunt resistor, RS, depends of the INA200, INA201, and INA202, which is on the application and is a compromise between complicated by the internal 5k Ω + 30% input small-signal accuracy and maximum permissible impedance; this is illustrated in Figure 29. Using the voltage loss in the measurement line. High values of lowest possible resistor values minimizes both the RS provide better accuracy at lower currents by initial shift in gain and effects of tolerance. The effect minimizing the effects of offset, while low values of on initial gain is given by Equation 3: RS minimize voltage loss in the supply line. For most applications, best performance is attained with an RS value that provides a full-scale shunt voltage range of 50mV to 100mV. Maximum input voltage for accurate (3) measurements is 500mV. Total effect on gain error can be calculated by replacing the 5k Ω term with 5kΩ – 30%, (or 3.5kΩ) or TRANSIENT PROTECTION 5k Ω + 30% (or 6.5kΩ). The tolerance extremes of The –16V to +80V common-mode range of the RFILT can also be inserted into the equation. If a pair INA200, INA201, and INA202 is ideal for withstanding of 100 Ω 1% resistors are used on the inputs, the automotive fault conditions ranging from 12V battery initial gain error will be 1.96%. Worst-case tolerance reversal up to +80V transients, since no additional conditions will always occur at the lower excursion of protective components are needed up to those levels. the internal 5k Ω resistor (3.5kΩ), and the higher In the event that the INA200, INA201, and INA202 excursion of RFILT – 3% in this case. are exposed to transients on the inputs in excess of Note that the specified accuracy of the INA200, their ratings, then external transient absorption with INA201, and INA202 must then be combined in semiconductor transient absorbers (such as zeners) addition to these tolerances. While this discussion will be necessary. Use of MOVs or VDRs is not treated accuracy worst-case conditions by combining recommended except when they are used in addition the extremes of the resistor values, it is appropriate to to a semiconductor transient absorber. Select the use geometric mean or root sum square calculations transient absorber such that it will never allow the to total the effects of accuracy variations. INA200, INA201, and INA202 to be exposed to transients greater than +80V (that is, allow for COMPARATOR transient absorber tolerance, as well as additional voltage due to transient absorber dynamic The INA200, INA201, and INA202 devices impedance). Despite the use of internal zener-type incorporate an open-drain comparator. This ESD protection, the INA200, INA201, and INA202 do comparator typically has 2mV of offset and a 1.3ms not lend themselves to using external resistors in (typical) response time. The output of the comparator latches and is reset through the RESET pin; see Figure 30. 12 Submit Documentation Feedback Copyright © 2006–2010, Texas Instruments Incorporated Product Folder Link(s): INA200 INA201 INA202 |
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