TPA0103 Audio Power Amplifier Evaluation Module User’s Guide August 1998 Mixed-Signal Products SLOU015
IMPORTANT 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.
Preface Related Documentation From Texas Instruments J 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. TPA0103 3-CHANNEL AUDIO POWER AMPLIFIER STEREO SINGLE-ENDED 500-mW AND MONO BTL 1.75-W (literature number SLOS167) This is the data sheet for the TPA0103 audio amplifier integrated circuit.
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Running Title—Attribute Reference Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.
Running Title—Attribute Reference Figures 1–1 2–1 2–2 3–1 3–2 3–3 3–4 3–5 3–6 3–7 3–8 3–9 3–10 The TI TPA0103 Audio Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Quick Start Module Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 Introduction This chapter provides an overview of the Texas Instruments (TI) TPA0103 Audio Amplifier Evaluation Module (SLOP103). 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3 1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Introduction
Feature Highlights 1.1 Feature Highlights The TI TPA0103 Audio Amplifier Evaluation Module and the TI Plug-N-Play Audio Amplifier Evaluation Platform include the following features: - - TPA0103 Low-Voltage Audio Power Amplifier Evaluation Module J J J J J J J J J J J - 1.75-W bridge-tied load (BTL) into 4 Ω at 5 V center channel 3.3-V and 5-V operation Low distortion (< 0.
Description 1.2 Description The TPA0103 Audio Power Amplifier Evaluation Module is a complete, low-power three-channel audio power amplifier. It consists of the TI TPA0103 3-Channel Audio Power Amplifier IC along with a small number of other parts mounted on a circuit board that measures approximately 2 inches by 1 inches (Figure 1–1). ¼ ½ Figure 1–1.
Chapter 2 Quick Start The steps in this chapter can be followed to quickly prepare the TPA0103 audio amplifier EVM for use. Using the TPA0103 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. The audio amplifier evaluation module can also be used stand-alone by making connections directly to the module pins, and it 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 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 TPA0103 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 and TPA0103 EVM 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 these steps to use the TPA0103 EVM stand-alone or connect it into existing circuits or equipment. Connections to the TPA0103 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.
Chapter 3 Details This chapter provides details on the TPA0103 IC, the evaluation module, and the steps in the Quick-Start List, additional application information, and a parts list for the TPA0103 evaluation module. Topic Page 3.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2 3.2 The TPA0103 Audio Power Amplifier Evaluation Module . . . . . . . . . 3–3 3.3 Using the TPA0103 EVM With the Plug-N-Play Evaluation Platform . . . . .
Precautions 3.1 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.
The TPA0103 Audio Power Amplifier Evaluation Module 3.2 The TPA0103 Audio Power Amplifier Evaluation Module The TPA0103 Audio Power Amplifier Evaluation Module is powered by a TPA0103 3-channel audio power amplifier capable of delivering 535 mW of continuous power to each of the left and right single-ended 4-Ω speaker loads, and 1.75 W of continuous power (BTL) to a center channel 4-Ω load.
The TPA0103 Audio Power Amplifier Evaluation Module Figure 3–3. TPA0103 EVM Schematic Diagram R15, 20 kΩ LOUT+ 1 R13 200 kΩ C3 5 pF 2 R2 20 kΩ C1 1 µF R1 20 kΩ 3 R4 20 kΩ LIN 4 5 LINHP R3 C2 1 µF 20 kΩ R16 20 kΩ R17 R18 20 kΩ 200 kΩ C12 5 pF VDD C5 2.
The TPA0103 Audio Power Amplifier Evaluation Module Figure 3–4. TPA0103 Amplifier IC TPA0103 C OUT– C IN C OUT+ SHUTDOWN CNTL MODE A MODE B R HP IN R OUT+ MUX R Line IN CNTL HP/Line L HP IN MUX L OUT+ L Line IN The IC includes three separate amplifier channels: a left and right stereo pair (single-ended) and a bridged-tied load (BTL) center channel. In the BTL mode, the two output lines of the center channel operate 180° out-of-phase with each other for increased power.
The TPA0103 Audio Power Amplifier Evaluation Module 3.2.3 Inputs and Gain The left and right single-ended channels remain separate from input to output. On the TPA0103 EVM board, the left and right channel inputs are mixed to produce a monaural representation of the stereo signal and applied to the amplifier IC center channel input. Each of the left and right channels has two separate signal inputs. They are called line and headphone (HP ) and are pin-selectable.
Using The TPA0103 EVM With the Plug-N-Play Evaluation Platform 3.3 Using The TPA0103 EVM With the Plug-N-Play Evaluation Platform The TPA0103 Audio Amplifier Evaluation Module was designed to be used with the TI Plug-N-Play Audio Amplifier Evaluation Platform. It simply plugs into socket U2. The following paragraphs provide additional details for using the TPA0103 EVM with the platform. 3.3.
Using The TPA0103 EVM With the Plug-N-Play Evaluation Platform 3.3.2 TPA0103 Module Jumper Settings The TPA0103 EVM is equipped with several jumpers that act like SPST switches to allow module operation to be modified to suit various requirements. In the following discussion, setting a jumper to ON means that a shunt is installed across the two pins of the jumper. Setting a jumper to OFF means that no shunt is installed on the jumper. See Figure 3.5.
Using The TPA0103 EVM With the Plug-N-Play Evaluation Platform 3.3.2.1 S1 — Shutdown Jumper To have the module amplifier IC enter the shutdown mode when the module mute control input is activated, set shutdown jumper S1 to ON. The mute control output pin on the TPA0103 amplifier IC goes high when the mute mode is selected by the output mode jumpers (S2 and S4).
Using The TPA0103 EVM With the Plug-N-Play Evaluation Platform 3.3.2.3 S3 — Input Select Jumper To select the line inputs, set input select jumper S3 to OFF. To select the headphone inputs, set input select jumper S3 to ON. The TPA0103 amplifier IC has two separate inputs for each of the left and right stereo channels. An internal multiplexor selects which input will be connected to the amplifier based on the state of the HP/LINE pin on the IC.
Using The TPA0103 EVM With the Plug-N-Play Evaluation Platform 3.3.3 Signal Routing Signal flow on the platform is controlled by two signal routing switches, as shown in Figure 3 – 5. Figure 3–6. Platform Signal Routing and Outputs Off + Audio Input R R R U1 Signal Conditioning S2 – U2 TPA0103 Amplifier EVM – L L L J8 Speaker Output + On U2 – U4 R U5 Stereo Headphone Amplifier R S3 + – J10 Headphone Output – GND L L + U5 3.3.3.
Using The TPA0103 EVM With the Plug-N-Play Evaluation Platform 3.3.4 Mode Control The TPA0103 EVM is equipped with a mode control input pin that receives a control signal from the platform. This EVM pin is connected to the amplifier IC Mode A output mode control input pin. The state of this input, in conjunction with the state of the Mode B output mode control input pin, controls the output mode of the amplifier IC on the EVM.
Using The TPA0103 EVM With the Plug-N-Play Evaluation Platform 3.3.4.2 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. J J 3.3.4.
Power Requirements 3.3.5 Power Requirements The TPA0103 Audio Power Amplifier Evaluation Module can operate from any voltage between approximately 3 V and 5.5 V; however, the TPA0103 amplifier IC on the module is characterized for operation at 3.3 V and 5 V. For best performance (highest output power with lowest distortion), the module should be operated at approximately 5 V unless there is a specific reason for operating it from a lower voltage.
Inputs and Outputs 3.3.6 Inputs and Outputs The TI Plug-N-Play Audio Amplifier Evaluation Platform is equipped with several standard conectors for audio inputs and outputs. 3.3.6.1 Inputs In most cases, audio signals enter the platform through either a pair of RCA phono jacks (J3 and J5) or a miniature (1/8″) stereo phone jack (J4). Certain signal conditioning and amplifier EVMs, however, may have additional signal input connectors mounted on the module circuit board.
Using The TPA0103 EVM Stand-Alone 3.4 Using The TPA0103 EVM Stand-Alone Using the TPA0103 Audio Power Amplifier Evaluation Module stand-alone is much the same as using it with the platform. The same 3-V to 5.5-V power supply range and the isolated OUT+ and OUT– lines for BTL operation requirement exists.
Using The TPA0103 EVM Stand-Alone 3.4.2 TPA0103 EVM Connected for Stereo Headphones Output Figure 3–10. TPA0103 EVM Connected for Stereo Headphones Output 5V Audio Input (Right) R10 C7 RHP GND R8 C6 RIN VDD R7 C9 C10 R15 R13 R2 C2 S2 C5 R1 GND LHP S4 R17 C12 C3 C1 HP/L* MODE A + 33 µF – 1000 µF 5V TPA0103 EVM REV. A Lit.
TPA0103 Audio Power Amplifier Evaluation Module Parts List 3.5 TPA0103 Audio Power Amplifier Evaluation Module Parts List Table 3–5. TPA0103 EVM Parts List Ref. Description Size EVM Qty. Manufacturer/ Part Number Digi-Key Number C1, C2, C6, C7 Capacitor, 1 µF, +80% –20%, nonpolarized 1206 4 Murata GRM42-6Y5V105Z16BL C5, C9, C10 Capacitor, 2.
