ADLINK ACL-8111 - Manual (Page 27)

Registers Format • 21
3.4 A/D Input Range Control Register
The gain control register is a write-only register using address Base + 9. It is
used to adjust the gain of the analog input programmable amplifier. The data
format is specified as follows:
Address: BASE + 9
Attribute: write only
Data Format:
Bit 7 6 5 4 3 2 1 0
BASE+9 X X X X X G2 G1 G0
Where G2, G1, and G0 are Gain selection:
G2 G1 G0 GAIN Input Range (V)
0 0 0 x1 ± 5V Power Up Setting
0 0 1 x2 ± 2.5V
0 1 0 x4 ± 1.25V
0 1 1 x8 ± 0.625V
1 0 0 x16 ± 0.3125V
1 0 1 Invalid X
1 1 0 Invalid X
1 1 1 Invalid X
The relationship between input voltage range, maximum input voltage and
gain is specified as the equation:
Analog Input Range = Maximum Input Voltage / Gain