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User’s Manual
11
PART 1 AD268
2. Specifications
2.2 Internal block diagram
The AD268 performs the following operations.
The external analog signals come to the buffer amplifier through the filter. The multiplexer
sequentially selects CH1 to CH8 to convert the input analog signals into digital data via the A/D
converter. The converted digital data reaches to the internal control circuit through optical
isolator. Every time when the T2 CPU requests to read the converted data, the internal control
circuit sends the data to the T2 CPU. The AD268's parameters are stored in the EEPROM.
Filter
Buffer
Multiplexer
1
3
2
Jumper
Filter
Buffer
1
3
2
Jumper
A/D conversion
Optical isolation
CH1
P
N
Internal control circuit
CH8
P
N
Filter
DC/DC
converter
Voltage
check
circuit
Regulator
+5V
+15V
-15V
AG
P24
COM
LG
FG
EEPROM
LED
T2 CPU
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