7733 datasheet(279/940 Pages) RENESAS

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A-D CONVERTER

7733 Group User’s Manual

9–14

00016

00116

00216

00316

00416

00516

00616

1520

3035

4045

5055

00716

00816

00916

00A16

00B16

+3 LSB

–3 LSB

Ideal A-D conversion

characteristics

Analog input voltage (mV)

Output code

(A-D conversion result)

Fig. 9.4.1 Absolute accuracy of A-D converter (when resolution = 10 bits)

9.4 Absolute accuracy and Differential non-linearity error

The A-D conversion’s accuracy is described below.

9.4.1 Absolute accuracy

The absolute accuracy is the difference expressed in the LSB between the actual A-D conversion result

and the output code of an A-D converter with ideal characteristics. The analog input voltage when measuring

the accuracy is assumed to be the mid point of the input voltage width that outputs the same output code

from an A-D converter with ideal characteristics. For example, in the case of the 10-bit resolution, when

VREF = 5.12 V, 1-LSB width is 5 mV, and 0 mV, 5 mV, 10 mV, 15 mV, 20 mV, ... are selected as the analog

input voltages.

The absolute accuracy = ±3 LSB when the analog input voltage = 25 mV indicates that the output code

expected from an ideal A-D conversion characteristics is “00516” but the actual A-D conversion result is

between “00216” to “00816.”

The absolute accuracy includes the zero error and the full-scale error.

The absolute accuracy degrades when VREF is lowered. The output codes for analog input voltages between

VREF and AVCC are “3FF16.”

9.4 Absolute accuracy and Differential non-linearity error

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