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August 1999 Mixed-Signal Products User ’ s Guide SLOU051A.
IMPORT ANT NOTICE T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify , before placing orders, that information being relied on is current and complete.
iii Chapter Title—Attribute Reference Preface Related Documentation From T exas Instruments TI Plug-N-Play Audio Amplifier Evaluation Platform (TI Literature Number SLOU01 1) provides detailed information on the evaluation platform and its use with TI audio evaluation modules.
iv.
Running Title—Attribute Reference v Chapter Title—Attribute Reference Contents 1 Introduction 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Feature Highlights 1-2 .
Running Title—Attribute Reference vi Figures 1–1 The TI TP A005D12 Class-D Stereo Audio Power Amplifier EVM — T op V iew 1-3 . . . . . . . . . 1–2 The TI TP A005D12 Class-D Stereo Audio Power Amplifier EVM — Bottom View 1-3 . . . . . . 2–1 Quick Start Platform Map 2-2 .
1-1 Introduction Introduction This chapter provides an overview of the T exas Instruments (TI ) TP A005D12 class-D stereo audio power amplifier evaluation module (SLOP246). It includes a list of EVM features, a brief description of the module illustrated with a pictorial diagram, and a list of EVM specifications.
Feature Highlights 1-2 Introduction 1.1 Feature Highlights The TI TP A005D12 class-D stereo audio power amplifier evaluation module and the TI plug-n-play audio amplifier evaluation platform include t.
Description 1-3 Introduction 1.2 Description The TP A005D12 class-D stereo audio power amplifier evaluation module is a complete, 2-W att per channel stereo audio power amplifier .
TP A005D12 Class-D EVM Specifications 1-4 Introduction Single in-line header pins extend from the underside of the module circuit board to allow the EVM to either be plugged into the TI plug-n-play audio Amplifier evaluation Platform, or to be wired directly into existing circuits and equipment when used stand-alone.
2-1 Quick Start Quick Start Follow the steps in this chapter to quickly prepare the TP A005D12 class-D stereo audio amplifier EVM for use. Using the TP A005D12 class-D EVM with the TI plug-n-play audi.
Precautions 2-2 Quick Start 2.1 Precautions Power Supply Input Polarity and Maximum V oltage Always ensure that the polarity and voltage of the external power connected to V CC power input connector J1, J2, and/or V DD power input connector J6 are correct.
Quick Start List for Platform 2-3 Quick Start 2.2 Quick Start List for Platform Follow these steps when using the TP A005D12 class-D EVM with the TI plug-n-play audio amplifier evaluation platform (see the platform user ’ s guide, SLOU01 1, for additional details).
Quick Start List for Stand-Alone 2-4 Quick Start 2.3 Quick Start List for Stand-Alone Follow these steps to use the TP A005D12 class-D EVM stand-alone or to connect it into existing circuits or equipment.
3-1 Details Details This chapter provides details on the TP A005D12 IC, the evaluation module, and the steps in the Quick-Start list, a discussion of class-D amplifiers, additional application information, a parts list for the TP A005D12 class-D evaluation module, module performance graphs, and module PCB layer illustrations.
Precautions 3-2 Details 3.1 Precautions Power Supply Input Polarity and Maximum V oltage Always ensure that the polarity and voltage of the external power connected to V CC power input connector J1, J2, and/or V DD power input connector J6 are correct.
The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-3 Details 3.2 The TP A005D12 Class-D Audio Power Amplifier Evaluation Module The TP A005D12 class-D stereo audio power amplifier evaluation module is powered by a TP A005D12 class-D stereo power amplifier integrated circuit.
The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-4 Details Figure 3–2. The TI TP A005D12 Class-D Stereo Audio Power Amplifier EVM — T op View T exas 1999 U1 +RIN– TP1 C5 Rout+ R2.
The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-5 Details Figure 3–4. TP A005D12 Class-D EVM Schematic Diagram TP A005D12 S2 SD R2 100k SD R1 100k S1 Mute Mute VDD C3 LOUTP 11 PGND .
The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-6 Details 3.2.2 Overview of Class-D Audio Amplifiers Class-D audio amplifiers are very similar in operation to switch-mode power supplies in that both compare an input signal with a reference to create an error voltage that controls a pulse-width modulator (PWM) circuit.
The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-7 Details Figure 3–6. Class-D Input and Output Waveforms V DD 0 V V RAMP V IN V OUT The V RAMP signal must be at a much higher freque.
The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-8 Details 3.2.4 Class-D Differential Inputs The TP A005D12 EVM line inputs allow the use of a single-ended or differential audio source. The differential input stage of the amplifier cancels any noise that appears on both input lines of a channel.
The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-9 Details 3.2.6 TP A005D12 Class-D EVM T est Points T est points have been included on the TP A005D12 class-D EVM to facilitate user analysis of device performance and design adjustments.
Class-D Amplifier Design Considerations 3-10 Details 3.3 Class-D Amplifier Design Considerations Detailed information for proper design and implementation of TI class-D audio power amplifiers appears in the application report Design Considerations for Class-D Audio Power Amplifiers , TI Literature Number SLOA031, on the TI website (http://www .
Using The TP A005D12 Class-D EVM With the Plug-N-Play Platform 3-1 1 Details 3.4 Using The TP A005D12 Class-D EVM With the Plug-N-Play Platform The TP A005D12 class-D stereo audio amplifier evaluation module was designed to be used with the TI plug-n-play audio amplifier evaluation platform.
Using The TP A005D12 Class-D EVM With the Plug-N-Play Platform 3-12 Details 3.4.2 Module Switches The TP A005D12 class-D stereo audio amplifier evaluation module is equipped with two pushbutton switches that allow the module shutdown and mute functions to be manually activated.
Using The TP A005D12 Class-D EVM With the Plug-N-Play Platform 3-13 Details 3.4.3 Signal Routing Signal flow on the platform is controlled by two signal routing switches, as shown in Figure 3 – 7.
Using The TP A005D12 Class-D EVM With the Plug-N-Play Platform 3-14 Details 3.4.4 Shutdown The TP A005D12 class-D EVM is equipped with a shutdown control input pin. When this input is tied to GND, the TP A005D12 amplifier IC on the module enters the shutdown mode and dissipates very little power .
Using The TP A005D12 Class-D EVM With the Plug-N-Play Platform 3-15 Details 3.4.4.2 Mute/Mode Select (JP6) A 3-pin jumper header (JP6) on the platform, functioning as an SPDT switch, routes the control signal from the headphone jack to either the mute control input pin or the mode control input pin of the evaluation module.
Power Requirements 3-16 Details 3.4.5 Power Requirements The TP A005D12 class-D stereo audio power amplifier evaluation module is designed to operate from a supply voltage between 4.5 V and 5.5 V . For best performance (highest output power with lowest distortion), the module should be operated at 5 V .
Inputs and Outputs 3-17 Details 3.4.6 Inputs and Outputs The TI plug-n-play audio amplifier evaluation platform is equipped with several standard conectors for audio inputs and outputs.
Using The TP A005D12 Class-D EVM Stand-Alone 3-18 Details 3.5 Using The TP A005D12 Class-D EVM Stand-Alone Using the TP A005D12 class-D stereo audio power amplifier evaluation module stand-alone is much the same as using it with the platform. The same 4.
Using The TP A005D12 Class-D EVM Stand-Alone 3-19 Details 3.5.2 Input Connections The class-D amplifier input signals can be connected in either of two ways: differential or single-ended.
TP A005D12 Class-D EVM Performance Characteristics 3-20 Details 3.6 TP A005D12 Class-D EVM Performance Characteristics The TP A005D12 class-D stereo audio power amplifier EVM was tested using an Audio.
TP A005D12 Class-D EVM Performance Characteristics 3-21 Details Figure 3–12. Class-D Amplifier Distortion versus Output Power at 4 Ω 1 THD+N – T otal Harmonic Distortion Plus Noise – (%) TOT AL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER 0.
TP A005D12 Class-D EVM Performance Characteristics 3-22 Details Figures 3–14 and 3–15 show a frequency sweep for a 1-W output. The lower frequency distortion of the graphs is dominated by noise, while the distortion at higher frequencies is due primarily to the fast-changing duty cycle of the PWM output.
TP A005D12 Class-D EVM Performance Characteristics 3-23 Details EVM crosstalk is shown in Figures 3–16 and 3–17. The frequency is swept from 20 Hz to 20 kHz for a constant 2-W output. Several factors affect crosstalk, such as component selection (especially the inductor), filter layout, grounding, and power supply decoupling.
TP A005D12 Class-D EVM Interconnects 3-24 Details 3.7 TP A005D12 Class-D EVM Interconnects T able 3–4 shows the correlation between the TP A005D12 class-D amplifier IC pins, the EVM pins, and the plug-n-play (PNP) platform sockets.
TP A005D12 Class-D EVM Bill of Materials 3-25 Details 3.8 TP A005D12 Class-D EVM Bill of Materials The components in the bill of materials (T able 3–5) were selected for their common values, availability , and the smallest size available to meet these criteria.
TP A005D12 Class-D EVM Schematic 3-26 Details 3.9 TP A005D12 Class-D EVM Schematic The following schematic depicts the TP A005D12 class-D EVM. Note: C13 and C14 are optional and have been provided to allow flexibility of design.
TP A005D12 Class-D EVM PCB Layers 3-27 Details 3.10 TP A005D12 Class-D EVM PCB Layers The following illustrations depict the TP A005D12 class-D EVM PCB assembly and layers. These drawings are not to scale. Gerber plots can be obtained from any TI Sales Office.
TP A005D12 Class-D EVM PCB Layers 3-28 Details Figure 3–21. TP A005D12 Class-D EVM T op Layer Figure 3–22. TP A005D12 Class-D EVM Second Layer.
TP A005D12 Class-D EVM PCB Layers 3-29 Details Figure 3–23. TP A005D12 Class-D EVM Third Layer Figure 3–24. TP A005D12 Class-D EVM Bottom Layer.
3-30 Details.
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