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7480 Group and 7481 Group User's Manual

2-30

APPLICATIONS

2.4 A-D Converter

2.4.2 Application Example of A-D Converter

POINT: To improve the accuracy of A-D conversion, A-D conversion values are determined by

Sampling Methods and , and Determining Methods and of Section 2.4.1

Determination of A-D Conversion Values.

SPECIFICATIONS:

After the running sampling has been taken 6 times, the sum of the sampling

results, except the minimum and maximum values, is divided by 4.

When the difference between the new average value and the previous updated

value is less than 5, the value is updated to the new value, when 5 or more,

the value is not updated.

Figure 2.4.1 shows the example of determining A-D conversion values.

Figure 2.4.2 shows the control procedure example of determining of A-D conversion values.

Figure 2.4.1 Example of Determining A-D Conversion Values

Sampling point

Time

= A816

Average value =

A916 + A816 + A716 + A816

A-D conversion result

AB16

A816

A716

A616

A816

A916

A716

(n+1)th

sampling

n-th

sampling

(n-1)th

sampling

(n-2)th

sampling

(n-3)th

sampling

(n-4)th

sampling

(n-5)th

sampling

(n-6)th

sampling

(n-7)th

sampling

A816

Maximum

value

The newest A-D conversion result

Minimum

value

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