ADLINK Technology ACL -6128, Руководство пользователя

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Low-Level Programming
•
17
MSB LSB
Step1 Step2
D/A Converter
BASE+1 or BASE+3 BASE+0 or BASE+2
3.3 Converted Data Representation
Two analog output range alternatives are provided by the ACL-6128 :
Unipolar and Bipolar. The numbering of the converted data with have
different presentation for different output range.
3.3.1 Unipolar Numbering
0
4095
0000 0000 0000 1111 1111 1111
2048
1000 0000 0000
V.OUT = -Vref * ( 0/4095)
V.OUT = -Vref * ( 2048/4095)
V.OUT = -Vref *
( 4095/4095)
Example:
Converted Data =2047
Binary Code =0111 1111 1111
Vref =-5V
V.OUT =-(-5 V) * ( 2047/ 4095) = 2.499 V
3.3.2 Bipolar Numbering
-2048 2047
0000 0000 0000 1111 1111 1111
0
1000 0000 0000
V.OUT = -Vref * ( -2048/2047)
V.OUT = -Vref *
(0/2047)
= 0V
V.OUT = -Vref * ( 2047/2047 )