HD64F7050 RENESAS [Renesas Technology Corp], HD64F7050 Datasheet - Page 478

• Manufacturer Part Number: HD64F7050
• Description: 32-Bit RISC Microcomputer SuperH RISC engine Family/
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 14 A/D Converter
6. A/D conversion precision definitions
Rev. 5.00 Jan 06, 2006 page 458 of 818
REJ09B0273-0500
Digital output
A/D conversion precision definitions are given below.
a. Resolution
b. Offset error
c. Full-scale error
d. Quantization error
e. Nonlinearity error
f. Absolute precision
111
110
101
100
011
010
001
000
0
The number of A/D converter digital conversion output codes
The deviation of the analog input voltage value from the ideal A/D conversion
characteristic when the digital output changes from the minimum voltage value
0000000000 to 0000000001 (see figure 14.9).
The deviation of the analog input voltage value from the ideal A/D conversion
characteristic when the digital output changes from 1111111110 to 111111111 (see figure
14.9).
The deviation inherent in the A/D converter, given by 1/2 LSB (see figure 14.8).
The error with respect to the ideal A/D conversion characteristic between the zero voltage
and the full-scale voltage. Does not include the offset error, full-scale error, or quantization
error.
The deviation between the digital value and the analog input value. Includes the offset
error, full-scale error, quantization error, and nonlinearity error.
1/8 2/8 3/8 4/8 5/8 6/8 7/8 FS
Ideal A/D conversion
Figure 14.9 A/D Conversion Precision Definitions
characteristic
Analog input voltage
Quantization
error
Digital output
Offset error
Ideal A/D conversion
characteristic
Actual A/D conversion
characteristic
Analog input voltage
Nonlinearity
error
Full-scale error
FS