Texas Instruments SLOU121 manual Inputs and Gain, Volume Control

Page 25

The TPA6011A4 Audio Power Amplifier Evaluation Module

In the single-ended mode, the headphone inputs are automatically selected and the speaker load is connected between the OUT+ terminal, through an output coupling capacitor, to system ground. For more information, see the TPA6011A4 amplifier IC data sheet, TI literature number SLOS392.

Figure 3–4. TPA6011A4 Amplifier IC

L HP

L IN+

L LINE–

FADE

RLINE– R IN+

R HP

MUX

 

VOLUME

SEDIFF

VOLUME

CONTROL

SEMAX

 

MUX

 

HP/LINE

SE/BTL

3.2.2Inputs and Gain

Each channel has two separate signal inputs, line and headphone (HP ), that are automatically selected with the output mode (SE/BTL). An input multiplexor in the amplifier IC selects the HP inputs when the IC is in the SE output mode and the line inputs when in the BTL output mode.

Line and headphone inputs share common positive inputs. If using separate line and headphone inputs, R IN+ and L IN+ should be ac-grounded through a capacitor. If using differential inputs, line and headphone inputs must be the same.

3.2.3Volume Control

Potentiometer R5 adjusts the gain of the amplifier when the amplifier is in BTL mode (a logic low on the SE/BTL pin). Turning the potentiometer clockwise increases the voltage on the VOLUME terminal (pin 21), resulting in a higher volume. Turning the potentiometer counter-clockwise decreases the voltage on the VOLUME terminal (pin 21), resulting in a lower volume. Table 3–1 lists the corresponding gain for the voltage applied to the VOLUME terminal. The voltages listed in the table are for VDD = 5 V. For a different VDD, the values in the table scale linearly. If VDD = 4 V, multiply all the voltages in the table by 4 V/5 V, or 0.8.

The TPA6011A4 allows the user to specify a difference between BTL gain and SE gain. When switching to SE mode (a logic high on the SE/BTL pin), the

Details 3-5

Page 24 Page 26
Image 25
Page 24 Page 26
Contents User’s Guide Important Notice EVM Important Notice EVM Warnings and Restrictions Information About Cautions and Warnings Read This FirstRelated Documentation From Texas Instruments Contents Tables FiguresIntroduction Feature Highlights Description TPA6011A4 EVM SpecificationsIntroduction EVM JP6 JP7 Quick StartPower PrecautionsPlatform Preparations Quick Start List for PlatformModule Preparation Typical TPA6011A4 EVM Jumper Settings Quick Start Module Map Quick Start List for Stand-AloneControl Inputs Quick Start Quick Start Details TI Plug-N-Play Audio Amplifier Evaluation Platform TPA6011A4 EVM TPA6011A4 Audio Power Amplifier Evaluation Module1 TPA6011A4 Audio Amplifier IC TPA6011A4 EVM Schematic DiagramInputs and Gain Volume ControlBlock Diagram of SE Volume Control DC Volume Control BTL Mode, VDD = 5 Differential Input BTL Operation Depop CircuitrySingle-Ended Operation 2 TPA6011A4 Module Jumper Settings and Switches Installing and Removing EVM BoardsEVM Insertion EVM Removal2.2 J1 Output Mode Jumper 2.1 S1 Shutdown Switch2.3 J2 Input Mode Jumper Signal Routing2.4 J3 Input and Output Mode Jumper 2.5 J4 Fade Mode JumperMute Shutdown/Mode Signal ConditioningHeadphone Output Jack Mute/Mode Select JP6 Headphone Jack Control SignalsMute/Mode Polarity Select JP8 Power Requirements Inputs Inputs and OutputsOutputs 1 TPA6011A4 EVM Connected for BTL Output Using the TPA6011A4 EVM Stand-Alone11. TPA6011A4 EVM Connected for Stereo Single-Ended Output 2 TPA6011A4 EVM Connected for Single-Ended OutputReference Reference TPA6011A4 EVM Layers and Board SchematicTPA06011A4 EVM Schematic Diagram TPA6011A4 EVM Parts List TPA6011A4 EVM Parts List

SLOU121 specifications

Texas Instruments SLOU121 is a comprehensive technical document that serves as a guide for the evaluation and implementation of various TI products. This document highlights the operational capabilities, design considerations, and practical applications of TI’s semiconductor solutions, with a focus on enabling engineers and designers to optimize their designs effectively.

One of the main features of SLOU121 is its emphasis on performance. It provides detailed specifications and operational data that help users understand the key parameters of TI products, such as voltage levels, current ratings, and thermal characteristics. This information is crucial for engineers as they design circuits that require precision and reliability.

The document also covers various technologies that Texas Instruments employs in its semiconductor solutions. These technologies include advanced CMOS processes, which enable high integration and low power consumption. Additionally, the use of innovative materials and structures enhances the performance and efficiency of the components, thereby providing manufacturers with the tools they need to create cutting-edge electronics.

Another important characteristic of SLOU121 is its user-friendly layout and structure. Information is organized in a manner that allows for quick referencing, which is essential for busy engineers who need to find specific data efficiently. The inclusion of diagrams, graphs, and tables further aids in visualizing the performance metrics and operational limits of the devices discussed.

Moreover, SLOU121 delves into specific applications where TI products excel. These applications range from automotive systems to industrial automation and consumer electronics. The guide also addresses compatibility with industry standards and protocols, which is vital for integration into existing systems.

In addition to technical specifications, the document provides guidance on practical implementation strategies. This includes best practices for layout design, thermal management, and component selection. By incorporating these recommendations, engineers can mitigate potential issues during the design phase and ensure that their final products meet or exceed performance expectations.

Overall, Texas Instruments SLOU121 is an essential resource that combines technical knowledge with practical advice, helping engineers to leverage TI technologies for innovative product development. By providing a thorough understanding of features, technologies, and recommendations, SLOU121 equips designers with the necessary tools to create high-performance electronic solutions.
Top Page Image Contents