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User’s Manual
21
PART 1 AD268
5. I/O Allocation and Programming
0 to 5V / 0 to 20mA range:
Input voltage/current A/D conversion data
0 to 5 V 0 to 20 mA Hexadecimal Integer
Resolution
Upper limit +5.1196 V +20.479 mA H3FFF 16383
:: : :
Full scale (positive) +5 V +20 mA H3E80 16000
:: : :
+0.3125 mV +0.00125 mA H0001 1
0 0 V 0 mA H0000 0
0.3125 mV / bit
1.25 µA / bit
0 to 20mA range:
D = 800 × A
D: Digital data
A: Analog signal (mA)
0
H3FFF
16383
Analog input
+5.1196V
20.479mA
Digital value
+10.2V
H3E80
16000
-10.2V
Upper limit
Lower limit
+5V
20mA
0 to 5V range:
D = 3200 × A
D: Digital data
A: Analog signal (V)
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