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MB88101A Datasheet(PDF) 9 Page - Fujitsu Component Limited. |
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MB88101A Datasheet(HTML) 9 Page - Fujitsu Component Limited. |
9 / 19 page ![]() MB88101A 9 (3) Definitions of A/D converter terms • Resolution Analog transition identifiable by the A/D converter • Linearity error Deviation of the straight line drawn between the zero transition point (0000 0000 0000 ↔ 0000 0000 0001) and the full-scale transition point (1111 1111 1110 ↔ 1111 1111 1111) of the device from actual conversion characteristics • Differential linearity error Deviation from the ideal input voltage required to shift output code by one LSB Notes: • The tolerance of output impedance of an external circuit connected to this A/D converter has an effect on conversion time (CLK frequency). See “s TYPICAL CHARACTERISTICS”. • If the output impedance of the external input is too high, the analog voltage sampling time may be short. • When turning the device on, turn the power supply for the digital system first before turning VREF on. Digital output Actual converted value Ideal converted value Analog output 1111 1111 1111 1111 1111 1110 0000 0000 0001 0000 0000 0000 0000 0000 0010 VOT VNT V(N+1)T VFST (1 LSB × N + VOT) Linearity error 1 LSB Linearity error Differential linearity error = = = - 1 (LSB) (LSB) VFST - VOT 4094 VNT - (1 LSB × N + VOT) 1 LSB V(N+1)T - VNT 1 LSB • • • • • • • • • • • • Analog input RON1 C0 RON2 Comparator ⋅ RON1 = About 1.5 kΩ ⋅ RON2 = About 1.5 kΩ ⋅ C0 = About 60 pF • Analog input equivalent circuit Note: The above values are reference values. |
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