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UM1483 Datasheet(PDF) 18 Page - STMicroelectronics |
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UM1483 Datasheet(HTML) 18 Page - STMicroelectronics |
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18 / 35 page  Board description UM1483 18/35 Doc ID 022398 Rev 1 The op amp is used in follower mode with gain of the op amp set by resistors r and R: Equation 2 It is possible to calculate the voltage on the op amp output OP OUT - VOUT as the sum of a bias VBIAS and a signal VSIGN component equal to: Equation 3 Total gain of the circuit with the resistor divider is equal to: Equation 4 with the default values this gives: ● VBIAS = 1.77 V ● Maximal voltage of VSIGN = 1.5 V ● G = 7.2 ● GTOT = 3.33 ● Maximum current amplifiable without distortion is 1.1 A. G Rr + r ------------ = V OU T V SIGN V BIAS + = V BI AS 3.3 1 R1 -------- 1 R2 -------- 1 R3 -------- ++ ⎝⎠ ⎛⎞ R3 × ---------------------------------------------------------- G × = V SIGN IR SHUNT × 1 R1 -------- 1 R2 -------- 1 R3 -------- ++ ⎝⎠ ⎛⎞ R1 × ---------------------------------------------------------- G × = G TOT V SI GN V IN ---------------- V SI GN R SHUN T I × ------------------------------- == |
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