Op-amp opps in battery-powered IIoT applications
Summary
Used as an open loop amplifier, its high gain characteristics create an output many thousands of times bigger than the potential difference between the inputs. Often used in a closed-loop configuration, negative feedback limits and controls the gain, with output voltage restricted by the supply rails levels (Figure 1). The rail-to-rail input and output op-amp operates from a 1.8 to 5.5V DC supply, has a maximum power profile of 40µA (at 5V) and exhibits a typical offset voltage of 5µV (at 25°C). The op-amps (Figure 2) are suitable for portable, battery-powered applications, signal conditioning circuits and medical instrumentation equipment. Figure 3 shows a circuit diagram of a bandpass filter with Analog Devices’ ADA4062 low power op-amp selected for the first stage.