LTC6247CDC#TRMPBF

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Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps encompasses a wide range of amplifiers and amplifier-like devices of varying levels of complexity. Among them is the LTC6247CDC#TRMPBF, a Micropower, Rail-to-Rail Instrumentation Amplifier (RRI). This application note will discuss the application fields and working principles of LTC6247CDC#TRMPBF.

Background

Instrumentation amplifiers (or “in-amps”) are a type of differential amplifier offering excellent linearity, common-mode rejection, and high input impedance. As its name implies, an in-amp is ideal for use in instrumentation amplifier applications, such as precision data acquisition, strain and pressure sensors, thermocouples, bridges, and similar circuits. LTC6247CDC#TRMPBF is a Micropower, Rail-to-Rail Instrumentation Amplifier (RRI) with a wide range of operating parameters and features that make it optimal for a variety of instrumentation applications.

Application Fields

The LTC6247CDC#TRMPBF is designed for high accuracy and low noise operation in a small SOT-23-5 package. The device operates from a 2.5V to 16V single-supply voltage, or ±1.25V to ±8V dual supply, allowing a wide dynamic range of operation. The device comprises three parts: a zero-input offset, low noise preamplifier; a gain stage; and a RRI output stage. When combined, they offer advantages such as high common-mode rejection (CMRR) over a wide frequency band, very low distortion, and excellent output settling performance.

The LTC6247CDC#TRMPBF is ideally suited for use in:

• Medical instrumentation for the measurement of bio signals, ECG and EEG.
• Test and measurement equipment for the measurement of temperature and other physical parameters.
• Automotive data acquisition applications.
• Industrial control and motor control.
• Signal conditioning and process control.
• Transducer signal conditioning.

Working Principle

The LTC6247CDC#TRMPBF is an RRI that operates over a wide range of supply voltages and load impedances. It provides reliability and low noise performance while offering excellent distortion characteristics. The LTC6247CDC#TRMPBF uses an input stage to establish the basic signal level and offers excellent input protection. The gain stage follows the preamplifier stage and establishes the gain of the amplifier. Finally, the RRI output stage ensures low distortion. It also provides a low output impedance and wide output voltage swing.

The LTC6247CDC#TRMPBF is designed to provide excellent common-mode rejection (CMRR) when operated with a wide range of input signal frequencies. The CMRR is a function of the op amp\'s open-loop gain and is generally optimized at the lower frequency range. The LTC6247CDC#TRMPBF exhibits an 11kHz CMR rating of -67dB typical.

The LTC6247CDC#TRMPBF makes use of the new "LTC6247HV" variants to provide robust and reliable output swing over its entire supply voltage range. The LTC6247HV Voltage Regulation feature ensures the output remains within 0.5V of the supply voltage rail regardless of load, input signal, and temperature changes. This allows users to have a consistent and reliable dynamic range, allowing maximum flexibility in the use of this device.

The low distortion performance of the LTC6247CDC#TRMPBF is also quite impressive. THD is rated at -108dB typical when operating from a single 9V supply. Low distortion is especially important for many instrumentation applications.

Conclusion

The LTC6247CDC#TRMPBF is an extremely versatile, low noise, micropower, rail-to-rail instrumentation amplifier for a wide range of instrumentation applications. Its features, such as excellent CMR, low distortion, and robust output swing make it well suited for use in medical instrumentation, measurement equipment, motor control, process control and transducer signal conditioning applications. The LTC6247CDC#TRMPBF is designed to provide an excellent performance and long-term reliability in these applications.

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