The INA145 is a precision, unity-gain difference amplifier consisting of a precision op amp and on- chip precision resistor network. Two external resistors set the gain from 1V/V to 1000V/V. The input com- mon-mode voltage range extends beyond the positive and negative rails. On-chip precision resistors are laser-trimmed to achieve accurate gain and high common-mode rejection. Ex- cellent TCR tracking of these resistors assures contin- ued high precision over temperature. The INA145 is available in the SO-8 surface-mount package specified for the extended industrial tempera- ture range, –40°C to +85°C.