User’s Guide July 2003 Mixed-Signal Products SLOU116
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use.
EVM WARNINGS AND RESTRICTIONS It is important to operate this EVM within the supply voltage range specified in the user’s guide. The supply voltage range should be 4.5 V to 5.5 V. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Preface How to Use This Manual This document contains the following chapters: - Chapter 1—Introduction - Chapter 2—Operation - Chapter 3—Reference Information About Cautions and Warnings This book may contain cautions and warnings. This is an example of a caution statement. A caution statement describes a situation that could potentially damage your software or equipment. This is an example of a warning statement. A warning statement describes a situation that could potentially cause harm to you.
Running Title—Attribute Reference Related Documentation From Texas Instruments J TI Plug-N-Play Audio Amplifier Evaluation Platform (literature number SLOU011) provides detailed information on the evaluation platform and its use with TI audio evaluation modules. J TPA2008D2 3-W STEREO CLASS-D AUDIO POWER AMPLIFIER (literature number SLOS413) This is the data sheet for the TPA2008D2 audio amplifier integrated circuit. FCC Warning This equipment is intended for use in a laboratory test environment only.
Running Title—Attribute Reference Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.
Running Title—Attribute Reference Figures 1–1 1–2 2–1 2–2 2–3 3–1 3–2 3–3 The TI TPA2008D2 Audio Amplifier EVM Without Output Filter — Top View . . . . . . . . . . . The TI TPA2008D2 Audio Amplifier EVM Without Output Filter — Bottom View . . . . . . . . Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Module Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 Introduction This chapter provides an overview of the Texas Instruments (TI) TPA2008D2 stereo filter-free class-D audio amplifier evaluation module (SLOP392). It includes a list of EVM features, a brief illustrated description of the module, and a list of EVM specifications. Topic Page 1.1 Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2 1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Feature Highlights 1.
Description 1.2 Description The TPA2008D2 filter-free class-D stereo audio power amplifier evaluation module is a complete, 3-W per channel class-D stereo audio power amplifier that can operate without an output filter. It consists of the TI TPA2008D2 class-D stereo 3-W audio power amplifier IC along with a small number of other parts mounted on a circuit board that measures approximately 2-1/4 inches by 1-1/2 inches. Figure 1–1.
TPA2008D2 EVM Specifications The platform has room for a single TPA2008D2 evaluation module and is a convenient vehicle for demonstrating TI’s audio power amplifier and related evaluation modules. The EVMs simply plug into the platform, which automatically provides power to the modules, interconnects them correctly, and connects them to a versatile array of standard audio input and output jacks and connectors.
Chapter 2 Operation The steps in this chapter can be followed to quickly prepare the TPA2008D2 stereo filter-free class-D audio amplifier EVM for use. Using the TPA2008D2 with the TI plug-n-play audio amplifier evaluation platform is a quick and easy way to connect power, signal and control inputs, and signal outputs to the EVM using standard connectors.
Precautions 2.1 Precautions Power Supply Input Polarity and Maximum Voltage Always ensure that the polarity and voltage of the external power connected to VCC power input connector J1, J2, and/or VDD power input connector J6 are correct. Overvoltage or reverse-polarity power applied to these terminals can open onboard soldered-in fuses and cause other damage to the platform, installed evaluation modules, and/or the power source.
Quick Start List for Platform 2.2 Quick Start List for Platform Follow these steps when using the TPA2008D2 EVM with the TI plug-n-play audio amplifier evaluation platform (see the platform user’s guide, literature number SLOU011, for additional details). Numbered callouts for selected steps are shown in Figure 2–2, and details appear in Chapter 3. - Platform preparations 1) Ensure that all external power sources are set to OFF and that the platform power switch S1 is set to OFF.
Quick Start List for Stand-Alone - Evaluation Module Preparations 11) Use potentiometer R3 to set the volume. Turning R3 in the clockwise direction will increase the volume. See Table 3–1 for voltage levels on the VOLUME pin and corresponding gain settings. 12) If using an external DAC, adjust R3 to the center position by placing a DMM across the VOLUME pin and ground and adjusting the potentiometer until 25 kΩ is measured across the leads. Apply the external source to the VOLUME pin. Figure 2–2.
Quick Start List for Stand-Alone Figure 2–3. Quick Start for Stand-Alone 6 Audio Input (Right) Audio Input (Left) 7 Right 5 4 External Shut Down Control (active low) 8 4 5 Left 5V 2 - Power supply 1) Ensure that all external power sources are set to OFF. 2) Connect an external regulated power supply set to 5 V to the module VDD and GND pins taking care to observe marked polarity. - Inputs and outputs 3) Ensure that audio signal source level adjustments are set to minimum.
Quick Start List for Stand-Alone The EVM should begin operation. 10) Adjust the signal source level and potentiometer R3 as needed.
Power Requirements 2.4 Power Requirements The TPA2008D2 audio power amplifier evaluation module can operate from any voltage between approximately 4.5 V and 5.5 V; however, the TPA2008D2 amplifier IC on the module is characterized for operation at 5 V. For best performance (highest output power with lowest distortion), the module should be operated at 5 V.
2-8 Operation
Chapter 3 Reference This chapter contains the EVM schematic, PCB layers, parts list, and dc volume control table. Topic Page 3.1 TPA2008D2 EVM Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2 3.2 TPA2008D2 EVM PCB Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3 3.3 TPA2008D2 EVM Parts LIst . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4 3.4 DC Volume Table . . . . . . . . . . . . . . . . . . . . . .
TPA2008D2 EVM Schematic 3.1 TPA2008D2 EVM Schematic Figure 3–1. TPA2008D2 Filter-Free Class-D EVM Schematic Diagram U1 TPA2008D2 C3 C4 0.1 µF LIN+ 0.1 µF SHUTDOWN SHUTDOWN R1 120 kΩ C2 1 LIN– S1 2 LINP 3 4 5 6 VDD LOUT+ GND 7 C7 1 µF C11 10 µF LOUT– 8 9 10 11 C6 220 pF R2 120 kΩ LINN SHUTDOWN PVDD LOUTP PGND PGND LOUTN PVDD RINN RINP BYPASS PVDD ROUTP PGND PGND ROUTN PVDD COSC NC ROSC VOLUME 24 23 0.1 µF AGND VDD RIN+ 0.
TPA2008D2 EVM PCB Layers 3.2 TPA2008D2 EVM PCB Layers Figure 3–2 and Figure 3–3 depict the TPA2008D2 EVM PCB layers. These drawings are not to scale. Gerber plots can be obtained from any TI sales office. Figure 3–2. TPA2008D2 EVM Top Assembly Figure 3–3.
TPA2008D2 EVM Parts List 3.3 TPA2008D2 EVM Parts List Table 3–1. TPA2008D2 EVM Parts List Reference Description Size EVM Qty. Manufacturer/ Part Number Vendor/ Part Number C1, C2, C3, C4 Capacitor, 0.
DC Volume Table 3.4 DC Volume Table Table 3–2. DC Volume Control Voltage on VOLUME Pin (V) (Increasing or Fixed Gain) Voltage on VOLUME Pin (V) (Decreasing Gain) Gain of Amplifier (dB) 0–0.34 0.31–0 –38 0.34–0.42 0.43–0.32 –37 0.43–0.52 0.54–0.44 –35 0.53–0.63 0.64–0.55 –33 0.64–0.75 0.75–0.65 –31 0.76–0.86 0.86–0.76 –29 0.87–0.97 0.97–0.87 –27 0.98–1.07 1.08–0.98 –25 1.08–1.18 1.19–1.09 –23 1.19–1.3 1.32–1.2 –21 1.31–1.41 1.42–1.33 –19 1.42–1.52 1.53–1.43 –17 1.53–1.
3-6 Reference
