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A-D CONVERTER

7733 Group User’s Manual

9–2

The A-D converter is described below.

For this A-D converter, 8-bit resolution or 10-bit resolution can be selected. It’s conversion method is the

successive approximation method and has 8 analog input pins.

9.1 Overview

The performance overview is listed in Table 9.1.1.

Table 9.1.1 Performance overview

9.1 Overview

Item

A-D conversion method

Resolution

Absolute accuracy

Analog input pin

Conversion rate per analog input pin

Performance

Successive approximation method

8/10 bits can be selected by software

8-bit resolution: ±2 LSB

10-bit resolution: ±3 LSB

8 pins (AN0 to AN7)

8-bit resolution: 49

φADV cycles

10-bit resolution: 59

φADV cycles

φADV: A-D converter’s operating clock

The A-D convertor has the following four operation modes.

s One-shot mode

A-D conversion is once performed for the input voltage of one analog input pin.

s Repeat mode

A-D conversion is repeatedly performed for the input voltage of one analog input pin.

s Single sweep mode

A-D conversion is performed for the input voltage of multiple analog input pins, one at a time.

s Repeat sweep mode

A-D conversion is repeatedly performed for the input voltage of multiple analog input pins.

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