MAX4274AGESA

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MAX4274AGESA Application Field and Working Principle

The MAX4274AGESA is a family of single or dual CMOS, low-power, low-voltage operational amplifiers (op amps) designed for portable applications such as cellular phones, PDAs, and personal digital assistants (PDAs). These amplifiers feature offset voltage nulling, low input bias and offset currents, and high common-mode rejection. Use of the MAX4274AGESA can reduce battery life in portable equipment and can improve performance in applications where low-level signals must be amplified with minimum noise and distortion.

Features

• Wide supply voltage range of 2.7 to 16V
• Low quiescent current: 4.5µA/amplifier and 7.2µA/amplifier (dual) at VS = 5V
• Low power consumption
• Low noise: 5nV/√Hz
• High open-loop gain: 80dB
• Low distortion: 0.003% typ
• High Common-Mode Rejection Ratio (CMRR): 97dB
• High slew rate: 0.5V/µs
• Low voltage offset: 4mV typ
• Low input bias current: 500pA typ

Applications

• Cellular phones
• Personal digital assistants (PDAs)
• Control loops
• Filtering
• ADC and DAC buffering
• Power supply regulation
• Measurement instruments
• Portable medical and test equipment

Working Principle

The MAX4274AGESA is designed for single or dual low-voltage, low-power applications. Its low-voltage capability is limited by the CMOS process used. The device is composed of three stages: an input stage, an output stage, and a gain stage. The input stage is an input differential amplifier, and the output stage is an output buffer. The input stage is composed of n-type and p-type MOSFETs arranged in a differential amplifier configuration.

The gain stage of the amplifier is composed of a CMOS differential amplifier and a mirrored follower. The differential amplifier is composed of n-type and p-type MOSFETs arranged in a differential pair configuration with a biasing network. The mirrored follower is a cascode configuration composed of an n-type and p-type MOSFET. The output stage is composed of two p-type MOSFETs arranged in an emitter-follower configuration. The output stage provides high current drive capability to adapt the amplifier to a variety of applications.

The MAX4274AGESA can be used in instrumentation, signal conditioning, or control loops. It provides low noise, low power consumption, low input offset and bias currents, and wide common-mode rejection. Its performance is superior to bipolar op amps in conditions of low supply voltage and wide temperature range. The MAX4274AGESA can be used in a wide range of applications, including filter circuits, data acquisition systems, ADCs and DACs, power supply regulation, and control systems.

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