HD6417727BP160CV Datasheet, PDF (934/1098 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family/ SH7700 Series

Section 28 A/D Converter
Digital output
Digital output
(2) Full-scale error
Ideal A/D
conversion
111
characteristics
110
101
100
011
010
(3) Quantization
error
001
000
0 1/8 2/8 3/8 4/8 5/8 6/8 7/8 FS
Analog input
FS: Full-scale voltage
voltage
Ideal A/D
conversion
characteristics
(4) Nonlinearity
error
Actual A/D
convertion
characteristics
(1) Offset error
FS
Analog input
voltage
Figure 28.8 Definitions of A/D Conversion Accuracy
28.7 Usage Notes
When using the A/D converter, note the points listed in section 28.7.1 below.
28.7.1 Setting Analog Input Voltage
• Analog Input Voltage Range: During A/D conversion, the voltages input to the analog input
pins ANn should be in the range AV_SS ≤ ANn ≤ AV_CC (n = 2 to 7).
• Set the AV_CC and AV_SS input voltages as defined in section 32, Electrical Characteristics.
28.7.2 Processing of Analog Input Pins
To prevent damage from voltage surges at the analog input pins (AN2 to AN7), connect an input
protection circuit like the one shown in figure 28.9. The circuit shown also includes an RC filter to
suppress noise. This circuit is shown as an example; The circuit constants should be selected
according to actual application conditions. Table 28.5 lists the analog input pin specifications and
figure 28.10 shows an equivalent circuit diagram of the analog input ports.
Rev.6.00 Mar. 27, 2009 Page 876 of 1036
REJ09B0254-0600