BUF22821EVM-USB

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The BUF22821EVM-USB is a low-cost, USB-based evaluation and demonstration board that is designed to demonstrate the capabilities of Texas Instruments’ BUF22821 low-input-impedance coaxial-cable powered audio amplifier with line-driver configuration. The board can also be used to evaluate the capabilities of other TI low-input-impedance audio amplifiers with line-driver configuration.

The BUF22821EVM-USB consists of a base board with a pre-assembled BUF22821 amplifier daughterboard. All of the necessary components to operate the amplifier are integrated on the daughterboard — including the amplifier IC, filter capacitors, trimpots, LEDs, and bias circuits. USB connectors on the baseboard allow for power to be supplied to the device, while a two-pin header and BNC connector allow for connection to the external audio source. The BUF22821EVM-USB also features an audio output jack for connecting to an external speaker or other device.

The primary application of the BUF22821EVM-USB is to provide a platform for demonstrating TI’s low-input-impedance audio amplifier with line-driver configuration in headphones, automotive, industrial, and portable audio applications. By connecting an input source to the BNC connector, an output signal can be obtained at the audio output jack to drive a speaker or other device. Because the board is powered through the USB port, no external power supply is required.

The working principle of the BUF22821EVM-USB involves the input amplifier amplifying the incoming signal, then sending the amplified signal to the signal output stage. This signal is then sent to the BNC connector at the output of the board. For input sources that are not sufficiently powerful to drive the amplifier, such as a microphone, an input gain adjustment is available to increase the sensitivity of the amplifier and drive the output stage better.

In addition to its primary application of demonstrating and evaluating TI’s low-input-impedance audio amplifier with line-driver configuration, the BUF22821EVM-USB can also be used as a low-cost way to test the performance of other audio amplifier circuits. By adding a few external components, such as a power supply, microphone, and other components, the board can be used to quickly test and evaluate any audio amplifier circuit. This is especially useful in applications where the amplifier needs to be quick and easy to measure, or where external controls are needed for optimized performance.

The BUF22821EVM-USB is a versatile evaluation and demonstration board designed to demonstrate the capabilities of TI’s low-input-impedance audio amplifier with line-driver configuration. It can also be used as an inexpensive way to test and evaluate other audio amplifier circuits. By connecting an input source and an external speaker to the board, users can quickly determine the performance of the amplifier as well as any modifications that need to be made for optimal performance.

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