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AN4439 Datasheet(PDF) 6 Page - STMicroelectronics |
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AN4439 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 16 page Calculating the input resistor values AN4439 6/16 DocID025908 Rev 1 2 Calculating the input resistor values We first calculate the voltages needed at the output of the first stage (VOUT1_0A) at the four different second stage gain settings. Figure 3. Second stage Op-Amp A simple KCL equation: Equation 1 where xR2 can be defined by the programmed gain as: Equation 2 Solving for VOUT1_0V provides: Equation 3 Looking at the CSI+ input we determine what the voltage (Vx, lower case x) at the Op-Amp pins must be to generate VOUT1_0V. We set CSI+ to 0V to simplify the equation. V OUT1_0V V X – R 2 ---------------------------------------- V X xR 2 ---------- = xR 2 A V2 R2 ⋅ = V OUT1_0V R 2 V X ⋅ V X xR 2 ⋅ + xR 2 ------------------------------------------------ = |
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