EVOC PCL-726, Руководство пользователя

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20
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Programming
AD11 .. AD0 : Analog to digital data. AD0 is Least Significant Bit, and
AD11 is Most Significant Bit.
X : Don't care
Two analog output range alternatives are provided by the PCL-726 :
Unipolar and Bipolar. The numbering of the converted data with have
different presentation for different output range.
3.2.1 Unipolar Numbering
0
4095
0000 0000 0000 1111 1111 1111
2048
1000 0000 0000
V.OUT = -Vref * ( 0/4096)
V.OUT = -Vref * ( 2048/4096)
V.OUT = -Vref * ( 4095/4096)
Example :
Converted Data = 2047
Binary Code = 0111 1111 1111
Vref = -5V
V.OUT = -(-5 V) * ( 2047/ 4096) = 2.498 V
3.2.2 Bipolar Numbering
-2048 2047
0000 0000 0000 1111 1111 1111
0
1000 0000 0000
V.OUT = -Vref * ( -2048/2048)
V.OUT = -Vref * (0/2048)
= 0V
V.OUT = -Vref * ( 2047/2048)
Example :
Converted Data = 500
Binary Code = 1001 1111 0100
Vref = -5V
V.OUT = -(-5 V) * ( 500/ 2048) = 1.220 V