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A-D CONVERTER
8.1 Overview
8.1 Overview
The A-D converter has the performance specifications listed in Table 8.1.1.
Table 8.1.1 Performance specifications of A-D converter
A-D conversion method
Resolution
Absolute accuracy
Analog input pin
Conversion rate per analog input pin
φ
: A-D converter's operation clock
AD
The A-D converter has the 5 operation modes listed below.
•One-shot mode
This mode is used to perform the operation once for a voltage input from one selected analog input pin.
•Repeat mode
This mode is used to perform the operation repeatedly for a voltage input from one selected analog input
pin.
•Single sweep mode
This mode is used to perform the operation for voltages input from multiple selected analog input pins, one
at a time.
•Repeat sweep mode 0
This mode is used to perform the operation repeatedly for voltages input from multiple selected analog
input pins.
•Repeat sweep mode 1
This mode is used to perform the operation repeatedly for voltages input from all analog input pins. In this
mode, analog input pins are separated into two groups according to the frequency of use. One is the group
for more frequencies of use, and the other is the group for fewer frequencies of use.
8–2
Item
7751 Group User's Manual
Performance specifications
Successive approximation conversion method
Either 8 bits or 10 bits can be selected by software
8-bit mode: ±2 LSB
10-bit mode: ±3 LSB
8 pins (AN
to AN
)
0
7
8-bit mode: 49 φ
cycles
AD
10-bit mode: 59 φ
cycles
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