MB9A110 Series - Fujitsu
MB9A110 Series - Fujitsu
MB9A110 Series - Fujitsu
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Definition of 12-bit A/D Converter Terms<br />
Digital output<br />
DS706-00011-1v0-E<br />
<strong>MB9A110</strong> <strong>Series</strong><br />
Resolution : Analog variation that is recognized by an A/D converter.<br />
Linearity error : Deviation of the line between the zero-transition point<br />
(0b000000000000←→0b000000000001) and the full-scale transition point<br />
(0b111111111110←→0b111111111111) from the actual conversion<br />
characteristics.<br />
Differential linearity error : Deviation from the ideal value of the input voltage that is required to change<br />
the output code by 1 LSB.<br />
0xFFF<br />
0xFFE<br />
0xFFD<br />
0x004<br />
0x003<br />
0x002<br />
0x001<br />
Linearity error of digital output N =<br />
Differential linearity error of digital output N =<br />
1LSB =<br />
Actual conversion<br />
characteristics<br />
{1 LSB(N-1) + VOT}<br />
Linearity error Differential linearity error<br />
VFST - VOT<br />
4094<br />
(Actuallymeasured<br />
value)<br />
(Actually-measured<br />
value)<br />
Actual conversion<br />
characteristics<br />
Ideal characteristics<br />
VOT<br />
VNT<br />
VFST<br />
(Actually-measured value)<br />
VNT - {1LSB × (N - 1) + VOT}<br />
1LSB<br />
V(N + 1) T - VNT<br />
1LSB<br />
[LSB]<br />
- 1 [LSB]<br />
N : A/D converter digital output value.<br />
VOT : Voltage at which the digital output changes from 0x000 to 0x001.<br />
VFST : Voltage at which the digital output changes from 0xFFE to 0xFFF.<br />
VNT : Voltage at which the digital output changes from 0x(N − 1) to 0xN.<br />
Digital output<br />
0x(N+1)<br />
0x(N-1)<br />
0x(N-2)<br />
Actual conversion<br />
characteristics<br />
Ideal characteristics<br />
(Actually-measured<br />
value)<br />
(Actually-measured<br />
value)<br />
Actual conversion characteristics<br />
AVss AVRH AVss AVRH<br />
Analog input Analog input<br />
0xN<br />
VNT<br />
V(N+1)T<br />
95
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