LM4250CM

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The LM4250CM monolithic amplifier is a dual, high performance, low power JFET input integrated circuit with a variety of applications in markets ranging from telecommunications, medical and industrial products. It is a high voltage, rail-to-rail instrumentation amplifier capable of operating with dual supplies up to 20V. Designed to meet the circuit needs of a wide range of instrumentation, portable and high performance communications applications, the LM4250CM amplifier offers the highest performance per watt, rail to rail operation and a host of other features.

Because of its high voltage (20V maximum operation) and its excellent slew rate, this instrumentation amplifier is often used in medical applications, such as electrocardiograms (ECGs) and pulse oximetry, and in instrumentation applications, such as weighing and analyzing processes. In addition, these high performance amplifiers can also be used for high speed communications, airborne applications, defense electronics and robotics.

The LM4250CM comes with a unique feature set to optimize performance in applications with strict power requirements. It offers low power consumption (below 1 mW) and high performance with rail-to-rail operation and precision linearity. Replacing a single standard device with the dual LM4250CM halves power consumption while doubling the performance.

The LM4250CM features an architecture designed to provide high performance while consuming minimal power. Its high open loop gain, current feedback input stage and precision metal film resistors combine to provide excellent linearity and low noise performance. Its wide bandwidth (F = 10 MHz) and rail-to-rail output enable high-speed operation. Additionally, a wide range of output and input operating supply voltage makes this device suitable for multiple application requirements.

The LM4250CM amplifier is essentially an internally compensated instrumentation amplifier, wherein the measured signal is amplified by a factor of (1 + RF / RI). The input signals are amplified by the current feedback amplifier which consists of two JFET input differential pairs and one pair of cascode transistors. The amplifier also includes precision metal film resistors that are used to set gain, temperature and frequency response. The gain is adjustable from 0 dB to 40 dB by changing the external resistive divider network. The gain setting is selected based on the application by selecting the appropriate resistors.

The LM4250CM amplifier features low current (Ib = 125 μA/channel), low noise (6 mVrms) and fast power-on-mute (0.2 ms typ). Its low power consumption (1 mW) and wide dynamic range (106 dB) make it suitable for portable instrumentation, medical and automotive applications. Furthermore, the quiescent current of the device is temperature compensated and highly stable.

The LM4250CM amplifier is a high performance, low power, dual-channel op-amp that has a wide range of applications or any circuit requiring dual amplifiers. It offers excellent linearity, low noise performance and fast power-on-mute. Its wide bandwidth and rail-to-rail output make it suitable for high-speed operation, allowing for precise signal amplification in a variety of measurement, medical and communication-related applications.

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