ADLINK ACL-6128A - Manual (Page 29)

Low-Level Programming • 21
3.3 Converted Data Representation
Two analog output range alternatives are provided by the ACL-6128A: Unipolar
and Bipolar. The numbering of the converted data with have different
presentations for different output ranges.
3.3.1 Unipolar Numbering
0 4095 2048
0000 0000 0000 1000 0000 0000 1111 1111 1111
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 0
1000 0000 0000 1111 1111 1111
V.OUT=-Vref*(-2048/2047) V.OUT=-Vref*(0/2047)
= 0V
V.OUT=-Vref*(2047/2047)
0000 0000 0000
Example:
Converted Data =500
Binary Code =1001 1111 0100
Vref =-5V
V.OUT =-(-5 V) * ( 500/2047) = 1.221 V