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INA195AIDBVT Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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INA195AIDBVT Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 15 page INA193,INA194 INA195,INA196 INA197,INA198 SBOS307B − MAY 2004 − REVISED JUNE 2004 www.ti.com 8 INPUT FILTERING An obvious and straightforward location for filtering is at the output of the INA19x series; however, this location negates the advantage of the low output impedance of the internal buffer. The only other option for filtering is at the input pins of the INA19x, which is complicated by the internal 5k Ω + 30% input impedance; see Figure 2. Using the lowest possible resistor values minimizes both the initial shift in gain and effects of tolerance. The effect on initial gain is given by: GainError% + 100 * 100 5k W 5k W ) R FILT Total effect on gain error can be calculated by replacing the 5k Ω term with 5kΩ − 30%, (or 3.5kΩ) or 5kΩ + 30% (or 6.5k Ω). The tolerance extremes of RFILT can also be inserted into the equation. If a pair of 100 Ω 1% resistors are used on the inputs, the initial gain error will be 1.96%. Worst-case tolerance conditions will always occur at the lower excursion of the internal 5k Ω resistor (3.5kΩ), and the higher excursion of RFILT − 3% in this case. Note that the specified accuracy of the INA19x must then be combined in addition to these tolerances. While this discussion treated accuracy worst-case conditions by combining the extremes of the resistor values, it is appropriate to use geometric mean or root sum square calculations to total the effects of accuracy variations. LOAD V SUPPLY f−3dB = f−3dB 1 2 π (2 R FILTER)CFILTER C FILTER R SHUNT << RFILTER R FILTER <100 R FILTER < 100 V IN+ V IN − +5V V+ OUT INA193 −INA198 5k Ω 5k Ω Figure 2. Input Filter (Gain Error − 1.5% to −2.2%) (1) |
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