Analog To Digital Conversion Characteristics - LG G3F-AD3A User Manual

Chapter 1 Introduction
1.3 Analog-to-Digital conversion characteristics
1.3.1 Voltage input
The A/D m o d u l e converts the analog input from external devices to the digital value that
can be handled by CPU module.
W h e n t he analog input is voltage input, the K4F-A D 3 A a n d K 7 F-A D 3 A h a s t wo input
r a n g e s s u c h a s 1 ~ 5 V D C a n d 0 ~ 1 0V DC . Th e K3 F -A D 2 A h a s three input range such as
1 ~ 5 V D C , 0 ~ 10VDC, and –1 0 ~ 1 0 V D C .
W ith all analog input range, the digital output is varied in the range of 0 ~ 4000. Therefore,
the resolution of the A/D m o d u le is obtained by following equation;
Resolution of
1) 1 ~ 5 V D C range
W h e n the A/D module operates with 1 ~ 5VDC range, the 1VDC anal o g input is
convert ed to digital 0, and the 5VD C a n a l og input is converted into digital output 4000.
Therefore, the resolution per 1 digital value is 0.001VDC.
4000
2000
0
1 V
Maximum
A/D module
3V
Analog input voltage
Figure 1.3 A/D conversion characteristics ( 1 ~ 5VDC )
input voltage Minimum
4000
2002
2001
2000
1999
1998
2.998V
5V
2.999V
1-3
input voltage
3.002V
3.001V
3.000V