7630 datasheet(183/238 Pages) RENESAS

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APPENDIX

3.2 Standard characteristics

3-12

7630 Group User’s Manual

3.2.4 A-D conversion standard characteristics

Figure 3.2.9 shows the A-D conversion standard characteristics.

The lower-side line on the graph indicates the absolute precision error (ERROR). It represents the deviation

from the ideal value. For example, the conversion of output code from 0 to 1 occurs ideally at the point

of AN0 = 10 mV, but the measured value is –2 mV. Accordingly, the measured point of conversion is

represented as “10 – (–2) = 12 [mV]”.

The upper-side line on the graph indicates the width of input voltages (1 LSB WIDTH) equivalent to output

codes. For example, the measured width of the input voltage for output code 7 is 19 mV, so the differential

nonlinear error is represented as “19 – 20 = –1 [mV] (–0.05 LSB)”.

Fig. 3.2.9 A-D conversion standard characteristics

Measured when a power source voltage is stable in the single-chip mode and the high-speed mode

A-D CONVERTER STEP WIDTH MEASUREMENT

VCC = 5.12 V, VREF = 5.12 V

XIN = 10 MHz, Analog port P00

Temp. = 25 deg.

–10

–20

–30

104

112

120

128

136

144

152

160

168

176

184

192

200

208

216

224

232

240

248

256

–10

–20

–30

–10

–20

–30

–10

–20

–30

(+1LSB)

(–1LSB)

(+1LSB)

(–1LSB)

1LSB WIDTH

Absolute precision error

STEP No.

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