R5S72011 RENESAS [Renesas Technology Corp], R5S72011 Datasheet - Page 920

• Manufacturer Part Number: R5S72011
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 20 A/D Converter (ADC)
These four error quantities are explained below with reference to figure 20.7. In the figure, the 10
bits of the A/D converter have been simplified to 3 bits. Offset error is the deviation between
actual and ideal A/D conversion characteristics when the digital output value changes from the
minimum (zero voltage) B'0000000000 (000 in the figure) to B'000000001 (001 in the figure)
(figure 20.7, item (1)). Full-scale error is the deviation between actual and ideal A/D conversion
characteristics when the digital output value changes from B'1111111110 (110 in the figure) to the
maximum B'1111111111 (111 in the figure) (figure 20.7, item (2)). Quantization error is the
intrinsic error of the A/D converter and is expressed as 1/2 LSB (figure 20.7, item (3)).
Nonlinearity error is the deviation between actual and ideal A/D conversion characteristics
between zero voltage and full-scale voltage (figure 20.7, item (4)). Note that it does not include
offset, full-scale, or quantization error.
Rev. 2.00 Sep. 07, 2007 Page 892 of 1164
REJ09B0321-0200
Digital output
111
110
101
100
011
010
001
000
[Legend]
FS: Full-scale voltage
0
1024
1
1024
2
characteristic
Figure 20.7 Definitions of A/D Conversion Accuracy
conversion
(3) Quantization
Ideal A/D
error
1022
1024
1023
1024
Analog input
voltage
FS
Digital output
characteristic
conversion
(1) Offset error
Ideal A/D
Actual A/D
convertion
characteristic
(4) Nonlinearity
(2) Full-scale error
error
Analog input
voltage
FS