LMH6646MA

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The LMH6646MA is a monolithic logarithmic amplifier which combines a low-noise linear front end and an output buffer amplifier. It is also known as an “instrumentation amplifier” as it provides high fidelity measurements with its high accuracy bandgap voltage reference. The amplifier is capable of providing a gain range of 1 to 2000, while being able to source 500mA of current when needed. It also features high voltage and current rejection along with temperature stability.

Application Field

The LMH6646MA is designed for a wide range of applications such as high performance audio preamplifiers, instrumentation amplifiers, complex signal processing and many more. It has been designed to power automotive, instrumentation and medical applications alike. Its high accuracy, wide dynamic range and low noise performance makes it ideal for a number of applications such as power monitoring, light intensity measurement, and pressure measurement.

Working Principle

The LMH6646MA works by amplifying an input voltage while maintaining a linear output. This is achieved by combining a front end Low Noise Amplifier (LNA) with a buffer output amplifier. The LNA is made up of an operational transconductance amplifier (OTA) and an output buffer connected to power sources. The bias for the OTA is controlled by a temperature stable bandgap voltage reference. Depending on the gain setting, the voltage reference is multiplied by a constant. This constant combined with the bandgap voltage multiplier sets the gain of the amplifier.

The LMH6646MA also features high voltage and current rejection as well as temperature stability. The low noise amplifier has an input referred noise of 6µV/√Hz and an output referred noise of 10pV/√Hz. It is also capable of sourcing 500mA when needed, making it an ideal choice for high power applications.

Overall, the LMH6646MA is a monolithic logarithmic amplifier offering a wide range of features making it suitable for a range of applications. It has been designed to provide high accuracy, wide dynamic range and low noise performance along with temperature stability. The amplifier has a gain range of 1 to 2000, making it ideal for a range of applications including power monitoring, light intensity measurement and pressure measurement.

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