Texas Instruments TPA0202 manual Signal Routing, Signal Conditioning, Headphone Output Jack

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Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform

3.3.3Signal Routing

Signal flow on the platform is controlled by two signal routing switches, as shown in Figure 3±5.

Figure 3±6. Platform Signal Routing and Outputs

R

 

Audio

U1

Signal

Input

Conditioning

 

L

 

Off

S2

On

 

 

 

+

 

 

R

 

R

 

U2

 

 

±

J7, J8, J9

TPA0202

 

 

 

 

 

 

Speaker

Amplifier EVM

 

 

 

±

Outputs

 

 

 

 

 

 

 

 

L

 

L

 

 

 

 

+

 

 

U2 ± U4

 

 

 

 

 

 

R

 

U5

R

 

+

 

Stereo

 

GND

±

J10

Headphone

S3

 

Headphone

 

 

Amplifier

L

 

±

Output

 

 

 

+

 

 

 

 

L

 

 

U5

 

 

 

3.3.3.1Signal Conditioning

The audio signal from the input jacks can be applied to the signal conditioning socket (U1) if an EVM is installed there, or socket U1 can be bypassed and the audio input signal applied directly to the inputs of the TPA0202.

-Switch S2 selects signal conditioning or bypasses it

3.3.3.2Headphone Output Jack

Switch S3 is the source select for the stereo headphone output jack, J10. The headphone jack is capacitively coupled (via 470 μF electrolytics) and can output either the signal from the headphone amplifier in socket U5, or the signal from the TPA0202 power amplifier installed in socket U2, as determined by the setting of headphone source select switch S3.

When S3 is set to the power amplifier position (U2 ± U4), the headphone jack is connected to the TPA0202 power amplifier OUT+ output lines. When a plug is inserted into the jack, signals output through J10 are returned to platform ground, requiring single-ended power amplifier operation. A switch inside the headphone jack produces a control signal that can be routed to the power amplifier socket to shut down the TPA0202 EVM or switch it to single-ended output mode when a plug is inserted.

Source select switch S3 connects the headphone jack to the output lines of either the headphone amplifier socket U5, or the power amplifier sockets (U2 ± U4).

JTo keep the TPA0202 amplifier outputs separated, set switch S3 to the headphone amplifier position (U5 ) and use the speaker outputs (J7, J8, and J9)

JTo route the TPA0202 amplifier outputs to the headphone output jack (J10), set switch S3 to the power amplifier position (U2 ± U4 ) Ð use this setting only if the TPA0202 EVM is to drive single-ended loads connected to J10

Details 3-11

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Contents Users Guide Important Notice Related Documentation From Texas Instruments PrefaceIf You Need Assistance Contents Tables FiguresIntroduction Feature Highlights ±1. The TI TPA0202 Audio Amplifier Evaluation Module DescriptionTPA0202 EVM Specifications EVM JP6 JP7 JP8 Quick StartAudio Input PrecautionsPlatform preparations Quick Start List for Platform±4. Typical TPA0202 EVM Jumper Settings ±3. Quick Start Module Map Quick Start List for Stand-AloneControl Inputs Details ±1. The TI Plug-N-Play Audio Amplifier Evaluation Platform ±2. TPA0202 EVM TPA0202 Audio Power Amplifier Evaluation Module1 TPA0202 Audio Amplifier IC ±3. TPA0202 EVM Schematic DiagramBTL Operation Depop CircuitryInputs and Gain SIngle-Ended OperationInstalling and Removing EVM Boards EVM InsertionEVM Removal ±5. TPA0202 EVM Jumpers and Switches 2 TPA0202 Module Jumper Settings and Switches2.3 S3 Ð Input Select Jumper 2.2 S2 Ð Mute Switch2.4 S4 Ð Output Mode Jumper 2.1 S1 Ð Shutdown Jumper2.6 S6 Ð Autosense Jumper 2.7 S7 Ð SE Output Mode Switch2.8 S8 Ð Junction Temperature Measurement Jumper 2.5 S5 Ð VDD Bridge JumperSignal Routing Signal ConditioningHeadphone Output Jack Mute/Mode Headphone Jack Control SignalsMute/Mode Polarity Select JP8 Mute/Mode Select JP6Power Requirements Inputs and Outputs InputsOutputs 1 TPA0202 EVM Connected for BTL Output Using The TPA0202 EVM Stand-Alone±10. TPA0202 EVM Connected for Stereo Single-Ended Output 2 TPA0202 EVM Connected for Single-Ended Output±1. TPA0202 EVM Parts List TPA0202 Audio Power Amplifier Evaluation Module Parts List

TPA0202 specifications

The Texas Instruments TPA0202 is a high-performance Class-D audio amplifier designed for a variety of portable audio applications. Renowned for its efficiency and sound quality, the TPA0202 is an ideal choice for battery-operated devices such as mobile phones, tablet computers, and other handheld devices. With the continuous push for better audio experiences in compact formats, the TPA0202 stands out with its impressive specifications and features.

One of the key characteristics of the TPA0202 is its power efficiency. Operating at a high efficiency rate of up to 90%, this Class-D amplifier minimizes heat generation, allowing it to deliver more power to the audio output while extending battery life. This efficiency is especially crucial for portable devices, where battery performance is a key consideration.

The TPA0202 supports an output power of 2 watts per channel into 4 ohms, making it capable of driving small speakers or headphones with excellent sound quality. The device features a built-in differential input stage that enhances noise immunity, thereby ensuring cleaner audio reproduction. It also supports a wide supply voltage range from 3V to 5.5V, contributing to its versatility in different applications.

In terms of audio quality, the TPA0202 boasts low total harmonic distortion (THD) and exceptional linearity, resulting in rich, clear audio output. Additionally, it comes equipped with selectable gain settings, allowing designers to tailor the amplifier to various output requirements and system designs.

The amplifier also integrates various protection features, including thermal shutdown, short-circuit protection, and undervoltage detection, ensuring robust operation under different conditions. The TPA0202 is also simple to implement in designs, with a minimal external component requirement, further enhancing its appeal to engineers seeking quick and efficient solutions for audio amplification needs.

Moreover, the compact package size of the TPA0202 allows for easy integration into space-constrained designs. With its combination of high efficiency, excellent audio quality, and protective features, the Texas Instruments TPA0202 continues to be a compelling choice for developers looking to enhance audio performance in portable and battery-operated devices. Whether for consumer electronics or in more specialized applications, the TPA0202 delivers reliable and impressive sound amplification, making it a go-to component for modern audio solutions.