LM7121IM5 Integrated Circuits (ICs)

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The LM7121IM5 instrumentation amplifier is a product series in the Linear Operation Amplifier (OP Amp) and Buffer Amp family. The available components of the LM7121IM5 have been specifically designed to meet the requirements of the high speed, low voltage and low power applications.

Application Field

The main application fields of the LM7121IM5 are in the field of precision current sensing, signal conditioning and signal transmission. In particular, it is suitable for applications where low current accuracy, high voltage flexibility and low power consumption are demanding.

In current sensing applications, some of the key features of the LM7121IM5 are the low offset voltage and the ultra-low power consumption, which allows it to provide an accurate representation of the current signal even in low current measurements.

In signal transmission, the LM7121IM5 can be used as a variable gain amplifier, providing adjustable gain for the signal path, and ensuring that the output voltage optimises the signal in each application. It also has a wide dynamic range for maximum signal noise handling.

For signal conditioning, the LM7121IM5 can be used as a programmable gain amplifier and can be configured to provide user-adjustable gain settings, making it ideal for applications where variable gain is needed.

Working Principle

The LM7121IM5 consists of a single amplifier stage with two inverting and two noninverting inputs. The noninverting and inverting inputs can be connected to a differential input signal and varying gain and offsets can be achieved by controlling the bias voltage connected to the amplifier inputs.

The LM7121IM5 also has an external current scaling resistor in series with the output, which helps to control the current consumption of the amplifier and to set the appropriate gain for the application.

The differential input stage amplifies the difference between the noninverting and inverting inputs. This difference is then amplified by the output stage and the gain is adjustable depending on the voltage levels at the amplifier pins. The output is then available at the output stage of the LM7121IM5.

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