User’s Guide November 2000 Mixed Signal Products SLOU089
MPORTANT NOTICE Texas 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.
Information About Cautions and Warnings Preface Read This First 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. The information in a caution or a warning is provided for your protection.
FCC Warning FCC Warning This equipment is intended for use in a laboratory test environment only. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference.
Running Title—Attribute Reference Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 TPA321 EVM Specifications .
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Chapter 1 Introduction This chapter provides an overview of the Texas Instruments (TI) TPA321 audio amplifier evaluation module (SLOP341). It includes a list of EVM features, a brief description of the module illustrated with a pictorial diagram, and a list of EVM specifications. Topic Page 1.1 Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2 1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Feature Highlights 1.1 Feature Highlights The TI TPA321 audio amplifier evaluation module and the TI plug-n-play audio amplifier evaluation platform include the following features: TPA321 Low-Voltage Audio Power Amplifier Evaluation Module Single channel, bridge-tied load (BTL) or single-ended operation 2.5-V and 5.
Description 1.2 Description The TPA321 audio power amplifier evaluation module is a complete, low power single-channel audio power amplifier. It consists of the TI TPA321 350-mW low-voltage audio power amplifier IC along with a small number of other parts mounted on a circuit board that is approximately one and a quarter inches square (see Figure 1–1). Figure 1–1.
1-4 Introduction
Chapter 2 Operations Follow the steps in this chapter to quickly prepare the TPA321 audio amplifier EVM for use. The TPA321 and the TI plug-n-play audio amplifier evaluation platform provide a quick and easy way to connect power, signal and control inputs, and signal outputs to the EVM using standard connectors; however the audio amplifier evaluation module can be used stand-alone by making connections directly to the module pins and can be wired directly into existing circuits or equipment.
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 on-board 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 Use the following steps when using the TPA321 EVM with the TI plug-n-play audio amplifier evaluation platform (see the platform user’s guide, SLOU011, for additional details). Numbered callouts for selected steps are shown in Figure 2–1 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 2.3 Quick Start List for Stand-Alone Follow the steps in this section to use the TPA321 EVM stand-alone or when connecting it into existing circuits or equipment. Connections to the TPA321 module header pins can be made via individual sockets, wire-wrapping, or soldering to the pins, either on the top or the bottom of the module circuit board. Numbered callouts for selected steps are shown in Figure 2–2 and details appear in Chapter 3. Figure 2–2.
Quick Start List for Stand-Alone 8) Adjust the signal source level as needed.
References 2.4 References 2.4.1 TPA321 EVM Connected for Stereo BTL Output Figure 2–3.
References 2.4.2 TPA321 EVM Connected for Stereo Single-Ended Output Figure 2–4. TPA321 EVM Connected for Stereo Single-Ended Output 5 VDC VDD GND Shutdown + S1 DL C1 R2 R3 C2 R4 C3 Audio Input (Right) C4 R1 IN– IN+ U1 † C5 OUT– GND OUT+ R C6 5 TEXAS INSTRUMENTS SLOP341 TPA321 MSOP EVM GND 5 VDC VDD GND Shutdown External Mute Control (active high) + S1 Audio Input (Left) C4 R1 IN– IN+ 33 µF – 1000 µF DL C1 R2 R3 C2 R4 C3 2.4.
TPA321 MSOP Audio Power Amplifier Evaluation Module Parts List 2.4.4 TPA321 MSOP Audio Power Amplifier Evaluation Module Parts List Table 2–3. TPA321 MSOP EVM Parts List Reference Description Manufacturer/ Part Number Size Qty. A 1 Panasonic ECS-TOJY106R Murata GRM39-Y5V105Z10PT Digi-Key Number C4 Capacitor, 10 µF, 6.
TPA321 MSOP EVM PCB Layers 2.4.5 TPA321 MSOP EVM PCB Layers The following illustrations depict the TPA321 EVM PCB layers and silkscreen. These drawings are not to scale. Gerber plots can be obtained from any TI sales office. Figure 2–6. TPA321 EVM PCB Figure 2–7.
TPA321 MSOP EVM PCB Layers Figure 2–8. TPA321 EVM Top Layer Figure 2–9.
