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ST10F271 データシート(PDF) 134 Page - STMicroelectronics |
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ST10F271 データシート(HTML) 134 Page - STMicroelectronics |
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134 / 173 page  Electrical characteristics ST10F271 134/173 Note: The total conversion time is compatible with the formula valid for ST10F269, while the meaning of the bit fields ADCTC and ADSTC is no longer compatible: the minimum conversion time is 388 TCL, which at 40 MHz CPU frequency corresponds to 4.85 µs (see ST10F269). 24.7.2 A/D conversion accuracy The A/D Converter compares the analog voltage sampled on the selected analog input channel to its analog reference voltage (VAREF) and converts it into 10-bit digital data. The absolute accuracy of the A/D conversion is the deviation between the input analog value and the output digital value. It includes the following errors: ● Offset error (OFS) ● Gain Error (GE) ● Quantization error ● Non-Linearity error (Differential and Integral) These four error quantities are explained below using Figure 39: A/D conversion characteristic. Offset error Offset error is the deviation between actual and ideal A/D conversion characteristics when the digital output value changes from the minimum (zero voltage) 00 to 01 (Figure 39, see OFS). Gain error Gain error is the deviation between the actual and ideal A/D conversion characteristics when the digital output value changes from the 3FE to the maximum 3FF, once offset error is subtracted. Gain error combined with offset error represents the so-called full-scale error (Figure 39, OFS + GE). Quantization error Quantization error is the intrinsic error of the A/D converter and is expressed as 1/2 LSB. Non-linearity error Non-Linearity error is the deviation between actual and the best-fitting A/D conversion characteristics (see Figure 39): ● Differential Non-Linearity error is the actual step dimension versus the ideal one (1 LSBIDEAL). ● Integral Non-Linearity error is the distance between the center of the actual step and the center of the bisector line, in the actual characteristics. Note that for Integral Non- Linearity error, the effect of offset, gain and quantization errors is not included. 10 01 TCL * 560 TCL * 1120 TCL * 52 TCL * 1732 10 10 TCL * 800 TCL * 1120 TCL * 196 TCL * 2116 10 11 TCL * 1600 TCL * 1120 TCL * 164 TCL * 2884 Table 67. A/D converter programming (continued) ADCTC ADSTC Sample Comparison Extra Total conversion |
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