INA128UAG4

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INA128UAG4 Application Field and Working Principle

The INA128UAG4 is a microscale Operational Amplifier (OP Amp) and Buffer Amplifier used in high-precision instrumentation and linear application fields. This integrated circuit features a low offset voltage, excellent temperature stability, low noise figures and high common-mode rejection ratio. With these features, the INA128UAG4 OP Amp and Buffer Amplifier is ideal for precision current-shaping, noise-free voltage amplification and high-resolution waveform reduction.

Characteristics of INA128UAG4

• Wide supply voltage range: 4.5V to 36V.
• Low offset voltage: typically 0.25mV.
• Low noise figure: typically 2.6nV/√ Hz.
• High common-mode rejection: typically 65dB.
• Excellent temperature stability: typically 0.1 μV/μC.
• High open-loop gain: typically 100dB.
• Very high slew rate: typically 900 V/μs.
• Excellent power supply rejection ratio: typically 85dB.

Applications of INA128UAG4

The INA128UAG4 Integrated Circuit is ideal for signal conditioning, including signal conditioning where precise, low-noise signals are required. The use of additional external components to buffer the output and reduce noise, is not required. This is especially ideal for applications in medical imaging, acoustic sensing, vibration sensing, and industrial automation.

The precise signal amplification and high-resolution waveform reduction of the INA128UAG4 make it ideal for high-precision instrumentation, test and measurement, and general purpose signal processing applications. The excellent temperature stability and extremely low offset voltage make the INA128UAG4 usable for precision signals, such as strain gauges, capacitive load cells, and road force gauges. It is also suitable for audio applications, such as PA systems, recording consoles, and PA amplifiers.

Working Principle of INA128UAG4

The operation of the INA128UAG4 is based on negative feedback. The amplifier has a differential input and one output (single-ended) stage. An input signal is applied to the non-inverting and inverting inputs, the difference between which is amplified and the amplified output is then fed back to the inputs. The feedback signal is a proportionate to the input signal itself, hence, the output follows the input signal, but inverted. The feedback signal is subtractive and has a limited frequency range. The gain of the amplifier is determined by the ratio of the feedback signal to the input signal.

Because of the feedback loop, the gain of an OP Amp is typically much larger than the gain of a buffer amplifier. The INA128UAG4 has a gain of >100dB wideband, making it ideal for high-precision instrumentation and linear application fields. Furthermore, due to the low noise and high common-mode rejection ratio of the INA128UAG4, there is an increased dynamic range for high-accuracy readings.

The INA128UAG4 is compatible with surface-mount, through-hole and board-to-board applications, and the optimized internal layout enables the user to easily reduce the overall size of the application circuit. The combination of this amplifiers high performance and efficiency makes it an ideal choice for high-precision instrumentation, linear application fields and general purpose signal conditioning.

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