HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 452
HD6417034B
Manufacturer Part Number
HD6417034B
Description
32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417034B.pdf
(687 pages)
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Section 14 A/D Converter
14.6
The A/D converter compares an analog value input from an analog input channel to its analog
reference value and converts it into 10-bit digital data. The absolute accuracy of this A/D
conversion is the deviation between the input analog value and the output digital value. It includes
the following errors:
These four error quantities are explained below using figure 14.7. 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) 0000000000 (000 in the figure) to
000000001 (001 in the figure)(figure 14.7, item (1)). Full-scale error is the deviation between
actual and ideal A/D conversion characteristics when the digital output value changes from
1111111110 (110 in the figure) to the maximum 1111111111 (111 in the figure)(figure 14.7, item
(2)). Quantization error is the intrinsic error of the A/D converter and is expressed as 1/2 LSB
(figure 14.7, item (3)). Nonlinearity error is the deviation between actual and ideal A/D conversion
characteristics between zero voltage and full-scale voltage (figure 14.7, item (4)). Note that it does
not include offset, full-scale, or quantization error.
Rev. 7.00 Jan 31, 2006 page 426 of 658
REJ09B0272-0700
Offset error
Full-scale error
Quantization error
Nonlinearity error
Definitions of A/D Conversion Accuracy
Digital output
111
110
101
100
011
010
001
000
0 1/8 2/8 3/8 4/8 5/8 6/8 7/8 FS
FS: Full-scale voltage
Figure 14.7 Definitions of A/D Conversion Accuracy
characteristic
conversion
Ideal A/D
(3) Quantization
error
Analog input
voltage
Digital output
characteristic
conversion
(1) Offset error
Ideal A/D
Actual A/D
convertion
characteristic
(4) Nonlinearity
error
(2) Full-scale error
Analog input
voltage
FS
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