Manuals / Texas Instruments / Home Audio / Stereo Amplifier

Texas Instruments SLOU121 manual 3.3.6Inputs and Outputs, 9.Typical Headphone Plug, Details

Models: SLOU121

1 42

Download 42 pages 3.77 Kb

Page 36

3.3.6Inputs and Outputs

Inputs and Outputs

3.3.6Inputs and Outputs

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

3.3.6.1Inputs

In most cases, audio signals enter the platform through either a pair of RCA phono jacks (J3 and J5) or a miniature (1/8 inch) stereo phone jack (J4). Certain signal conditioning and amplifier EVMs, however, may have additional signal input connectors mounted on the module circuit board. The TPA6011A4 EVM has a special PC BEEP signal input pin (TP2) on the top of the module PCB.

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.

3.3.6.2Outputs

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 inch) 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 TPA6011A4 power amplifier EVM to operate in the highly-efficient bridge-tied load configuration when driving speakers.

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 (see Figure 3 –6). When the TPA6011A4 output signal is routed to J10 by S3, signals output via J10 are returned to platform ground when a plug is inserted (see Figure 3 –8), requiring single-ended operation of the power amplifiers.

Figure 3–9. Typical Headphone Plug

Left					Right			GND

3-16

Details

Image 36

Texas Instruments SLOU121 manual 3.3.6Inputs and Outputs, 9.Typical Headphone Plug, Details

Contents

TPA6011A4 Audio Power Amplifier Evaluation Module Mixed Signal ProductsUser’s Guide FebruaryIMPORTANT NOTICE EVM IMPORTANT NOTICE EVM WARNINGS AND RESTRICTIONS How to Use This Manual Read This FirstInformation About Cautions and Warnings PrefaceRelated Documentation From Texas Instruments FCC WarningRelated Documentation From Texas Instruments Contents Figures Tablesviii Introduction ChapterPage Feature Highlights1.1 Feature Highlights Introduction1.3 TPA6011A4 EVM Specifications 1.2 DescriptionIntroduction Introduction Quick Start Table 2–2.Typical TPA6011A4 EVM Jumper SettingsChapter Page2.1 Precautions Figure 2-1.Quick Start Platform Map2.2 Quick Start List for Platform Power SupplyPlatform Preparations Inputs and OutputsTable 2-4.Typical TPA6011A4 EVM Jumper Settings Power UpFigure 2–2.Module Preparation 2.3Quick Start List for Stand-Alone Figure 2–3.Quick Start Module MapQuick Start Power-Up Evaluation Module PreparationsControl Inputs of the EVM is provided to monitor the dc voltage. See Table 3–1for gain settings Quick StartQuick Start Details PrecautionsUsing the TPA6011A4 EVM With the Plug-N-Play Using The TPA6011A4 EVM Stand-Alone3.1 Precautions DetailsFigure 3–2.TPA6011A4 EVM Details3.2.1TPA6011A4 Audio Amplifier IC Figure 3–3.TPA6011A4 EVM Schematic DiagramDetails 3.2.3Volume Control 3.2.2Inputs and GainFigure 3–4.TPA6011A4 Amplifier IC DetailsFigure 3–5.Block Diagram of SE Volume Control DetailsTable 3–1.DC Volume Control BTL Mode, VDD = 5 VOLUME PINDetails GAIN OF AMPLIFIER3.2.4Differential Input Table 3-2.DC Volume Control SE Mode, VDD =Details 3.2.5Depop Circuitry 3.2.6BTL Operation3.2.7Single-EndedOperation Details3.3.1Installing and Removing EVM Boards 3.3.1.1EVM Insertion3.3.1.2EVM Removal DetailsFigure 3–6.TPA6011A4 EVM Jumpers and Switches 3.3.2.1S1 — Shutdown Switch3.3.2.2J1 — Output Mode Jumper Details3.3.3Signal Routing Figure 3–7.Platform Signal Routing and Outputs3.3.4Mute Shutdown/Mode 3.3.3.1Signal Conditioning3.3.3.2Headphone Output Jack Details3.3.4.1Headphone Jack Control Signals Figure 3–8.Mute/Mode and Polarity Control3.3.4.2Mute/Mode Select JP6 3.3.4.3Mute/Mode Polarity Select JP83.3.5Power Requirements Power RequirementsDetails 3.3.6Inputs and Outputs Figure 3–9.Typical Headphone PlugDetails 3.4 Using the TPA6011A4 EVM Stand-Alone 3.4.1TPA6011A4 EVM Connected for BTL OutputAudio Input Right Audio Input Left 33 ∝ F – + 1000 ∝ F3-18 Reference TPA6011A4 EVM Layers and Board SchematicTPA6011A4 EVM Parts List Chapter4.1 TPA6011A4 EVM Layers and Board Schematic TPA6011A4 EVM Layers and Board SchematicFigure 4–1.TPA06011A4 EVM Top View Figure 4–2.TPA06011A4 EVM Bottom ViewFigure 4–3.TPA06011A4 EVM Schematic Diagram TPA6011A4 EVM Layers and Board SchematicReference 4.2 TPA6011A4 EVM Parts List TPA6011A4 EVM Parts ListReference Reference