The schematic shown in the Section 6.2 gives a basic representation of the internal operation of the LMP860x-Q1.

The signal on the input pins is typically a small differential voltage developed across a current sensing shunt resistor. The input signal can also appear at a high common-mode voltage. The input signals are accessed through two input resistors that change the voltage into a current. The proprietary chopping level-shift current circuit pulls or pushes current through the input resistors to bring the common-mode voltage behind these resistors within the supply rails.

Subsequently, the signal is gained up by a factor of 10 and brought out on the A1 pin through a trimmed 100kΩ resistor. In the application, additional gain adjustment or filtering components can be added between the A1 and A2 pins as explained in subsequent sections. The signal on the A2 pin is further amplified by a factor of 2 (LMP8601-Q1), 5 (LMP8602-Q1), or 10 (LMP8603-Q1), and brought out on the OUT pin.