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MAX9938FEBS Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX9938FEBS Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 14 page The MAX9938 allows two methods of filtering to help improve performance in the presence of input common- mode voltage and input differential voltage transients. Figure 1 shows a differential input filter. The capacitor CIN between RS+ and RS- along with the resistor RIN between the sense resistor and RS- helps filter against input differential voltages and prevents them from reaching the MAX9938. The corner frequency of this filter is determined by the choice of RIN, CIN, and the value of the input resis- tance at RS- (R1). See Table 1 for R1 values at the dif- ferent gain options. The value of RIN should be chosen to minimize its effect on the input offset voltage due to the bias current at RS-. RIN x IBIAS contributes to the input voltage off- set. IBIAS is typically 0.2μA. Placing RIN at the RS- input does not affect the gain error of the device because the gain is given by the ratio between ROUT and R1 at RS+. Figure 2 shows the input common-mode filter. Again, the corner frequency of the filter is determined by the choice of RIN, CIN and is affected by R1. In this case RIN affects both gain error and input offset voltage. RIN should be smaller than R1 so that it has negligible effect on the device gain. If, for example, a fil- ter with RIN = 10 Ω and CIN = 1μF is built, then depend- ing upon the gain selection, the gain error is affected by either 2.5% (G = 25V/V, R1 = 400 Ω) or 5% (G = 50V/V, R1 = 200 Ω) or 10% (G = 100V/V, R1 = 100Ω) or 10% (G = 200V/V, R1 = 100 Ω). 1µA, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier 8 _______________________________________________________________________________________ Figure 2. Input Common-Mode Filter RSENSE CIN CIN RIN RIN RS- OUT GND RS+ MAX9938 LOAD RSENSE CIN RIN RS- OUT GND RS+ MAX9938 LOAD Figure 1. Differential Input Filter |
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