SH7059 Datasheet, PDF (604/1042 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

18. A/D Converter
*1 *1
R_in^*2
100 Ω
0.1 μF
AV_CC
AV_ref
AN0–AN31
AV_SS
Notes: *1
10 μF
0.01 μF
This LSI
*2 R_in: Input impedance
Figure 18.9 Example of Analog Input Pin Protection Circuit
Table 18.5 Analog Pin Specifications
Item
Analog input capacitance
Permissible signal source impedance
Min
Max
Unit
—
20
pF
—
3
kΩ
18.6.1 A/D conversion accuracy definitions
A/D conversion accuracy definitions are given below.
1. Resolution
The number of A/D converter digital conversion output codes
2. Offset error
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 (does not include quantization error) (see figure
18.10).
3. Full-scale error
The deviation of the analog input voltage value from the ideal A/D conversion characteristic when the digital output
changes from 1111111110 to 111111111 (does not include quantization error) (see figure 18.10).
4. Quantization error
The deviation inherent in the A/D converter, given by 1/2 LSB (see figure 18.10).
5. Nonlinearity error
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.
6. Absolute accuracy
The deviation between the digital value and the analog input value. Includes the offset error, full-scale error,
quantization error, and nonlinearity error.
Rev.3.00 Mar. 12, 2008 Page 514 of 948
REJ09B0177-0300