AD8231_07 Datasheet, PDF (7/8 Pages) Analog Devices – Zero Drift, Digital Programmable Instrumentation Amplifier

Preliminary Data Sheet
GAIN SELECTION
The AD8231’s gain is set by voltages applied to the A0, A1, and
A2 pins. High (HI) or low (LO) voltage limits are listed in the
specifications section. To change the gain, the WR pin must be
driven low. When the WR pin is driven high, the gain is
latched, and voltages at the A0-A2 pins will have no effect. Table
3 is the truth table showing the different gain settings.
WR A2 A1 A0 Gain
LO LO LO LO 1
LO LO LO HI 2
LO LO HI LO 4
LO LO HI HI 8
LO HI LO LO 16
LO HI LO HI 32
LO HI HI LO 64
LO HI HI HI 128
HI X X X No change
Table 3 Truth table for AD8231’s gain settings
AD8231
Rev. PrC | Page 7 of 8