7721 datasheet(572/577 Pages) RENESAS

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APPENDIX

7721 Group User’s Manual

17–109

Appendix 12. Standard characteristics

3. A-D converter standard characteristics

The lower lines of the graph indicate the absolute precision errors. These are expressed as the deviation

from the ideal value when the output code changes. For example, the change in output code from 0 to 1

should occur at 10 mV, but the measured value is +2 mV. Accordingly, the measured point of change is

10 + 2 = 12 mV.

The upper lines of the graph indicate the input voltage width for which the output code is constant. For

example, the measured input voltage width for which the output code is 15 is 24 mV, so that the differential

non-linear error is 24 – 20 = 4 mV (0.2 LSB).

[Measurement conditions]

•Vcc = 5 V, VREF = 5.12 V, f(XIN) = 25 MHz, Ta = 25 °C,

φAD = f2 divided by 2

STEP No.

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–20

–30

1624324048566472808896

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STEP No.

–10

–20

–30

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