MAX9634HERS+T

The MAX9634HERS+T is a high-accuracy, low-power, single-supply, dual-channel instrumentation amplifier (IA). It offers excellent accuracy over a wide common-mode range, low total harmonic distortion (THD) and low-noise. These features make the MAX9634HERS+T an ideal solution for a variety of medical, audio and industrial applications.

Overview

The MAX9634HERS+T is part of Maxim Integrated\'s family of instrumentation amplifiers; these devices are designed specifically to amplify signals in the presence of large common mode voltages. Instruments amplifiers generally provide the capability to reject common-mode signals, offering higher CMRR (common-mode rejection) and increased accuracy. The MAX9634HERS+T offers a low power, wide temperature range solution, with excellent accuracy and reliability in harsh environments.

Features

• High precision: Offers 0.005% accuracy over an extended temperature range of -40°C to +125°C with little power consumption.
• Low THD: Provides low noise, low THD and low output offset.
• Wide bandwidth: Delivers a bandwidth of 350kHz with a low power on-chip startup circuit.
• Integrated power supply: Includes an integrated power supply and shutdown control circuit.
• On-chip gain selection: Features on-chip gain selection and integrated anti-aliasing filters.

Applications

The MAX9634HERS+T is well suited for a variety of medical, audio and general industrial applications. These include:

• Medical instrumentation
• Recording/sound systems
• Consumer electronics
• Battery monitoring
• Industrial automation
• Automotive systems

Working Principle

The MAX9634HERS+T is designed to accurately amplify small signal inputs in the presence of very large common-mode signals. It achieves its high accuracy with an on-chip DC-canceling circuit. This circuit allows the signal\'s common-mode voltage to span from V– to V+, while the device itself only uses a single power supply. For example, the device can accept a signal from a single-supply sensor but reject the large common-mode signal which is produced by the power supply.

The MAX9634HERS+T has an on-chip gain selection circuit that allows for the gain to be adjusted for either the single-ended or differential-input signal. It also includes integrated anti-aliasing filters which help to reduce the noise that can be generated when higher-frequency signals are amplified.

Conclusion

The MAX9634HERS+T is a precision, low-power dual-channel instrumentation amplifier which provides excellent accuracy over a wide common-mode range. The on-chip circuits make it well suited for applications in the medical, audio and industrial fields. It is efficient, robust and offers excellent performance at an economical price point.