Inputs and Outputs

3.3.5Inputs and Outputs

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

3.3.5.1Inputs

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.

3.3.5.2Outputs

Amplified audio output signals 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 a miniature (1/8) stereo phone jack (J10), for headphones.

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 TPA301 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 TPA301 output signal is routed to J10 by S3, signals output via J10 are returned to platform ground when a plug is inserted (Figure 3 –7), requiring single-ended operation of the power amplifiers.

Figure 3–7. Typical Headphone Plug

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Texas Instruments TPA301 manual Inputs and Outputs

TPA301 specifications

Texas Instruments TPA301 is a highly efficient, low-power audio amplifier designed for portable audio applications. This device is particularly well-suited for mobile phones, tablets, and other compact audio systems where space is limited but sound quality remains a priority. The TPA301 sits at the intersection of advanced audio technology and user-friendliness, making it a go-to choice for designers seeking a high-performance solution.

One of the main features of the TPA301 is its Class D architecture, which offers superior energy efficiency compared to traditional Class AB amplifiers. This means that less power is wasted as heat, allowing for longer battery life in portable devices. The TPA301 delivers up to 1.5W per channel into an 8-ohm load at low-distortion levels, ensuring that consumers experience clear audio reproduction, even at high volumes.

Furthermore, the TPA301 integrates several advanced technologies, including a built-in digital signal processor (DSP) that enables sophisticated audio processing capabilities. This DSP allows for features like active noise cancellation and equalization, enhancing the listening experience by tailoring the audio output according to the environment. The device also supports various audio inputs, including I2S, PCM, and TDM formats, providing design flexibility for developers.

The TPA301 is designed with a focus on compactness and thermal management, featuring a small package size that makes it ideal for space-constrained applications. Additionally, its low quiescent current contributes to minimal power consumption when the amplifier is in standby mode, making it a perfect fit for portable gadgets where battery longevity is critical.

Another notable characteristic of the TPA301 is its robust protection features, including over-temperature protection, short-circuit protection, and under-voltage lockout. These safety mechanisms ensure reliable operation under various conditions, protecting both the amplifier and connected speakers from damage.

In summary, Texas Instruments TPA301 stands out as an efficient, compact audio amplifier designed specifically for portable applications. Its combination of Class D efficiency, built-in DSP capabilities, wide audio format support, and comprehensive protection features make it an excellent choice for designers aiming for high-quality audio in a small footprint. Whether in smartphones or tablets, the TPA301 ensures consumers enjoy an unparalleled audio experience.