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Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps

The MAX4075ADESA+ is a single low-power operational amplifier from Maxim Integrated, featuring low quiescent current and low power consumption. It is specially designed for battery-powered instrumentations, medical treatments, laboratory and industrial measurements.

Features

• Low Supply Current: 70 μA/ch (VCC = 5V)
• Low Offset Voltage: 30 μV Max
• Low Input Voltage Noise: 5.5 nV/√Hz
• Rail-to-Rail Input/Output
• Wide Supply Voltage Range: 2V to 6V
• Input Linearity Over Temperature: 0.1%
• Low Quiescent Current: 35 μA/ch
• Fast Response Time: 1μs Settling Time
• Low Power Consumption: 3.1 mW/ch
• High Gain Bandwidth Product: 500 kHz

Applications

• Batteries powered instrumentations
• Laboratory measurements
• Industrial measurements
• Medical treatments
• Data acquisition systems

Functional Block Diagram and Working Principle

The MAX4075ADESA+ has a single low-power operational amplifier and additional features such as rail-to-rail input/output and wide supply voltage range. As shown in Figure 1, the MAX4075ADESA+ consists of three parts: the amplifier and two building blocks.

Figure 1: MAX4075ADESA+ Functional Block Diagram

Input Stage: The input stage consists of four devices. The first is the input differential pair, which consists of two high-voltage devices M1a and M1b with their respective input pins (grounded). The differential pair works as a large, scaled current mirror, allowing a wide range of input voltages, including rail-to-rail. The next stage consists of two cascode transistors, M2 and M3, which act as voltage sources, providing high output impedance. The third stage, which is optional, includes two resistors, R1 and R2, and a third transistor, M4. This stage is used to adjust the input offset voltage, providing an adjustment range of about ±30 μV. The fourth stage is the comparison network, comprised of two resistors, R3 and R4, and two transistors, M5 and M6. This stage provides a feedback loop between the input and output of the amplifier.

Output Stage: The output stage of the MAX4075ADESA+ is a high-voltage current-to-voltage amplifier (CVA). The CVA is a fully differential amplifier that converts the input differential current into an output voltage. The voltage output of the CVA is then converted to a single-ended voltage by an output amplifier, consisting of transistors M7, M8, and M9. The output amplifier is designed to drive capacitive loads up to 200 pF. The output stage features rail-to-rail output capability and can provide a voltage gain of up to 100 dB (1000 : 1).

Power Supply Stage: The MAX4075ADESA+ is powered by two supplies, VDD and VSS. The VDD supply is connected to the amplifier\'s power bus, while the VSS supply is connected to its ground bus. Both supplies are connected to the amplifier\'s output stage to provide the necessary output bias voltage. The amplifier has an input voltage range from 2V to 6V, which allows it to be used in a wide variety of applications.

Conclusion

The MAX4075ADESA+ single low-power operational amplifier from Maxim Integrated is an ideal choice for battery-powered instrumentation and medical treatments, as well as laboratory and industrial measurements. Its low quiescent current and low power consumption make it a viable solution for such applications. With its rail-to-rail input/output and wide supply voltage range of 2V to 6V, the MAX4075ADESA+ is capable of providing accurate and stable results.

References

• MAXIM Integrated, “MAX4075ADESA+: Low-Power, Low-Offset, Low-Noise Diff-Amps,” 2012.
• MAXIM Integrated, “MAX4075ADESA+,” 2019.

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