LMH6518SQEVK/NOPB

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Evaluation boards are designed to provide easy and quick evaluation of a particular component, often in the form of an operational amplifier (op amp). This article examines the application field and working principle of the Texas Instruments LMH6518SQEVK/NOPB evaluation board.

The LMH6518SQEVK/NOPB is a low-noise, low-power, dual-channel low-distortion operational amplifier specifically designed to provide a comprehensive solution for audio systems that require highly accurate sound reproduction. It has a typical noise of 4.5 µV (16 kHz BW) and exhibits a low-power consumption of only 700 µA per channel. The LMH6518 is ideal for applications such as audio distributing systems, active speakers, driver amplifiers, portable audio, and line amplifiers.

The board features two low-power, low-noise op-amp channels on a 4-layer, 1.6 mm thick PCB. It offers single-supply operation from 5 V to +15 V and comprises a 5.5 V LDO regulator for the positive power supply. The LMH6518 has two control pins that allow it to be switched from unity-gain, low- power movement into a wide range of gains with minimal distortion. In addition to the evaluation board, the package also includes a power supply module, a user guide, and several jumpers for modifying the evaluation settings.

The working principle of the LMH6518SQEVK/NOPB is based on the core operational amplifier architecture. It uses an npn bipolar junction transistor (BJT) as the input stage, a pnp BJT as the output stage and several resistors and capacitors as feedback components. The performance of the amplifier is further enhanced by the inclusion of on-chip precision resistors (TRIMRs) that allow the user to adjust the gain of the amplifier.

The LMH6518 also includes an integrated temperature-compensated bias current, which minimizes output drift and enhances the total harmonic distortion (THD) performance. In addition, the device features an integrated charge pump that allows the device to operate in single-supply operation without a need for an external supply of negative power.

The LMH6518SQEVK/NOPB evaluation board provides an ideal platform to enable the testing and development of audio systems requiring a high level of performance at a low power consumption. The design of the board allows users to quickly and easily explore the performance of the operational amplifier with minimal configuration. The board also includes several jumpers that allow the user to modify the evaluation settings, including the gain range of the amplifier. This feature allows the user to fine-tune the performance of the device to match the exact requirements of its intended application.

In conclusion, the Texas Instruments LMH6518SQEVK/NOPB evaluation board is a comprehensive platform that enables easy and quick evaluation of a low-noise, low-power dual-channel operational amplifier. The board features two op-amps, a 5.5 V LDO regulator, and a charge pump, as well as several jumpers for modifying the evaluation settings. The board is suitable for a wide range of audio applications, such as active speakers, driver amplifiers, line amplifiers, and portable audio. The inclusion of on-chip precision resistors and a temperature-compensated bias current further enhance the performance of the device.

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