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RX634 Scheda tecnica(PDF) 93 Page - Renesas Technology Corp |
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RX634 Scheda tecnica(HTML) 93 Page - Renesas Technology Corp |
93 / 106 page R01DS0255EJ0100 Rev.1.00 Page 93 of 106 Feb 25, 2015 RX634 Group 5. Electrical Characteristics Figure 5.37 Illustration of A/D Converter Characteristic Terms Absolute accuracy Absolute accuracy is the difference between output code based on the theoretical A/D conversion characteristics, and the actual A/D conversion result. When measuring absolute accuracy, the voltage at the midpoint of the width of analog input voltage (1-LSB width), that can meet the expectation of outputting an equal code based on the theoretical A/D conversion characteristics, is used as an analog input voltage. For example, if 12-bit resolution is used and if reference voltage (VREFH0 = 5.12 V), then 1-LSB width becomes 1.25 mV, and 0 mV, 1.25 mV, 2.5 mV, ... are used as analog input voltages. If analog input voltage is 10 mV, absolute accuracy = ±5 LSB means that the actual A/D conversion result is in the range of 003h to 00Dh though an output code, 008h, can be expected from the theoretical A/D conversion characteristics. Integral nonlinearity error (INL) Integral nonlinearity error is the maximum deviation between the ideal line when the measured offset and full-scale errors are zeroed, and the actual output code. Integral nonlinearity error (INL) Actual A/D conversion characteristic Ideal A/D conversion characteristic Analog input voltage Offset error Absolute accuracy Differential nonlinearity error (DNL) Full-scale error FFFh 000h 0 Ideal line of actual A/D conversion characteristic 1-LSB width for ideal A/D conversion characteristic Differential nonlinearity error (DNL) 1-LSB width for ideal A/D conversion characteristic VREFH0 (full-scale) A/D converter output code |
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