Using The TPA112 MSOP EVM With the Plug-N-Play Evaluation Platform

3.3.4Inputs and Outputs

The TI plug-n-play audio amplifier evaluation platform is equipped with several standard conectors for audio inputs and outputs.

3.3.4.1Inputs

In most cases, audio signals enter the platform through either a pair of RCA phono jacks (J3 and J5) or a miniature (1/8″ ) stereo phone jack (J4). Certain signal conditioning and amplifier EVMs, however, may have additional signal input connectors mounted on the module circuit board.

The platform audio signal input jacks (J3, J4, and J5) are of the closed-circuit type, grounding the signal input lines when no plugs are inserted.

3.3.4.2Outputs

Output signals from the headphone amplifier (U5) leave the platform through a miniature (1/8″ ) stereo headphone jack (J10). Amplified audio output signals from the power amplifiers (U2 – U4) leave the platform through left and right RCA phono jacks (J7 and J9), left and right pairs of compression connectors for stripped speaker wires (J8), and optionally, through the headphone jack.

The audio output lines from the power amplifiers are separate all the way to the edge of the platform (output jacks J7, J8, and J9) — the OUT– lines from the power amplifier sockets are not tied to each other or to platform ground. This allows the power amplifier EVMs to operate in the highly-efficient bridge-tied load configuration.

The headphone jack (J10) is capacitively coupled to source select switch S3, which connects J10 to the output lines of either the headphone amplifier socket or the power amplifier sockets (Figure 3 –5). When the TPA112 MSOP EVM output signal is routed to J10 by S3, signals output via J10 are returned to platform ground when a plug is inserted (Figure 3 –6).

Figure 3–6. Typical Headphone Plug

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Details 3-9

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Texas Instruments SLOU023A manual Inputs and Outputs
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SLOU023A specifications

Texas Instruments SLOU023A is a technical document outlining the features and specifications of the LMH6629, a high-speed, low-noise operational amplifier designed for various analog applications. This op amp is particularly well-suited for precision signal processing, making it a popular choice in industries such as telecommunications, industrial automation, and medical electronics.

One of the main features of the LMH6629 is its high bandwidth. With a gain bandwidth product of 1.5 GHz, it supports a wide range of frequencies, enabling it to process fast-changing signals without significant distortion. This characteristic is critical in applications that require accurate signal amplification and processing, such as RF and video signal conditioning.

In addition to its high bandwidth, the LMH6629 boasts a low noise figure. The device is designed to minimize noise contribution, ensuring high fidelity in signal processing applications. This low noise performance makes it an excellent choice for use in audio processing, medical instruments where signal fidelity is crucial, and sensor applications where precise measurements are required.

Another notable technology utilized in the LMH6629 is its ability to operate at low supply voltages while maintaining high performance. This feature enhances the amplifier's versatility in battery-powered applications, where power efficiency is key. The op amp can operate with supply voltages as low as ±2.5V, making it suitable for modern low-voltage designs.

Furthermore, the LMH6629 provides excellent power supply rejection and common-mode rejection, which are essential for maintaining signal integrity in noisy environments. These characteristics help reduce the impact of power supply variations and external interferences, ensuring reliable operation in diverse application settings.

The package options for the LMH6629 also contribute to its usability. It comes in various forms including surface-mount packages, allowing for easy integration onto PCBs while optimizing space in compact designs.

In summary, Texas Instruments SLOU023A details the impressive features of the LMH6629 operational amplifier, highlighting its high bandwidth, low noise performance, power efficiency, and versatility in various industrial applications. This amplifier stands out as a reliable component for engineers seeking high-performance solutions in analog signal processing.
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