LMH6703MFX/NOPB

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LMH6703MFX/NOPB is a precision low power instrumentation amplifier, which is designed to provide precise, linear amplification with minimal drift in a wide range of instrumentation, data acquisition and high resolution sensor applications. The device combines a digitally controlled gain setting and voltage offset adjustment with high gain accuracy, low roll-off, a wide bandwidth and low 1/f noise.

The LMH6703MFX/NOPB is a single-supply, rail-to-rail differential instrumentation amplifier. The device operates on a single 2.7V to 5.5V supply, and the high gain, low power parameters are optimized for immersion into a battery powered environment.

The LMH6703MFX/NOPB is an ideal choice for low power, precision tools, as it offers precision performance with minimal power waste. The differential amplifier is also available with voltage offset control, and can be configured with a gain of up to 500, allowing it to be used in a wide range of applications, such as low-level signal monitoring, low-noise preamplifiers, low-distortion filter stages, and more.

Working Principle

The LMH6703MFX/NOPB is composed of one single-ended input stage, one fully differential input stage and a programmable gain stage. In the first (single-ended) stage, the single-ended input signal is converted to a fully differential signal through an AC-coupled single-ended-to-differential stage. The gain of this stage is controlled by the DC bias currents of current sources, with the maximum gain of unity.

In the following stage, the differential signal is amplified by the fully differential amplifier. The gain of the amplifier is internally fixed to a value at the midband, but the gain can be dynamically programmed by the gain-setting voltage through digital-to-analog converters (DACs). Therefore, the device can support a range of gains from 1 to 500.

The last stage of the amplifier is the output stage. It is also a differential amplifier with dynamic gain control and AC-coupled output. The gain of this amplifier is internally fixed by its DC bias current, and the output is provided at the outputs of both the differential amplifier stage and the output stage.

The LMH6703MFX/NOPB supports the open-loop gain trimming and DC offset correction functions. In the open-loop gain trimming mode, the output can be adjusted by choosing a corresponding voltage from the DACs. The gain of the amplifier can then be changed by applying a voltage to the trimming pin. The DC offset correction function is used to adjust the common-mode voltage of the amplifier, which consequently allows the offset voltage at the output of the amplifier to be minimized.

Application Fields

The LMH6703MFX/NOPB can be used in a wide range of instrumentation and data acquisition applications, including sensors, current monitors, data acquisition systems and low power motor drives. The device\'s low power consumption and high precision enable it to provide reliable results in even the most demanding of applications. It is particularly suitable for applications where accuracy is paramount, such as medical instrumentation, process control, and systems requiring low input/output offset and noise performance.

The LMH6703MFX/NOPB is fully compliant with the industrial temperature range of -40°C to +125°C, making it suitable for a variety of industrial, monitoring and measurement applications. The device is available in the standard 8-pin SOIC (Small-Outline Integrated Circuit) package and can be used in any industry standard configuration, as well as custom configurations.

The LMH6703MFX/NOPB is a versatile and reliable solution for applications requiring a low-power, high-precision instrumentation amplifier. Its low power and wide range of capabilities make it a great choice for a variety of industrial, medical, and measurement applications.

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