ADLINK ACL-8112 Series - Manual (Page 43)

Registers
• 35
4.4 A/D Range Control Register
The A/D range register is used to adjust the analog input ranges for the
A/D channels. Two factor effects the input range: Gain and Polarity. For
the ACL-8112PG, This register controls the PGA (programmable gain)
directly and there is no Unipolar setting. When a different gain value is set,
the analog input range is changed. For the ACL-8112DG/HG, both the
PGA and polarity are controlled by this register. Table 4.2 shows the
relationship between the register data and the A/D input range.
Address : BASE + 9
Attribute: write only
Data Format:
Bit 7 6 5 4 3 2 1 0
BASE+9 X X X X G3 G2 G1 G0
G0~G3: Gain / Range selection, G3 is not used for ACL-8112PG
( This table is only for the ACL-8112HG: High Gain Card)
G3 G2 G1 G0 GAIN
Bipolar
or
Unipolar
Input Range
0 0 0 0 1 Bipolar ±
5V
0 0 0 1 10 Bipolar ±
0.5V
0 0 1 0 100 Bipolar ±
0.05V
0 0 1 1 1,000 Bipolar ±
0.005V
0 1 0 0 1 Unipolar 0V ~ 10V
0 1 0 1 10 Unipolar 0V ~ 1V
0 1 1 0 100 Unipolar 0V ~ 0.1V
0 1 1 1 1,000 Unipolar 0V ~ 0.01V
1 0 0 0 0.5 Bipolar ±
10V
1 0 0 1 5 Bipolar ±
1V
1 0 1 0 50 Bipolar ±
0.1V
1 0 1 1 500 Bipolar ±
0.01V
1 1 0 0 1 Unipolar N/A
1 1 0 1 10 Unipolar N/A
1 1 1 0 100 Unipolar N/A
1 1 1 1 1,000 Unipolar N/A
Table 4.2-1 Function of the Gain Control Bits