ADLINK ACL-6126 - Manual (Page 25)

Registers Format • 19
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 are provided by the ACL-6126, that is,
Unipolar and Bipolar. The numbering of the converted data with have
different presentation for different output range.
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
Bipolar Numbering
-2048
2047
0000 0000 0000 1111 1111 1111
0
1000 0000 0000
V.OUT = -Vref * ( -2048/2048) V.OUT = -Vref * (0/2048) 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