TPA701 MSOP Audio Power Amplifier Evaluation Module User’s Guide November 1998 Mixed-Signal Products SLOU026A
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. TPA701 700-mW LOW-VOLTAGE AUDIO POWER AMPLIFIER (literature number SLOS229) This is the data sheet for the TPA701 audio amplifier integrated circuit. FCC Warning This equipment is intended for use in a laboratory test environment only.
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Running Title—Attribute Reference Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 TPA701 EVM Specifications .
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 The TI TPA701 MSOP Audio Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Quick Start Module Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 Introduction This chapter provides an overview of the Texas Instruments (TI) TPA701 MSOP Audio Amplifier Evaluation Module (SLOP213). 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 TPA701 MSOP Audio Amplifier Evaluation Module and the TI Plug-N-Play Audio Amplifier Evaluation Platform include the following features: - - TPA701 Low-Voltage Audio Power Amplifier Evaluation Module J J J J J J - 1-2 3.
Description 1.2 Description The TPA701 MSOP Audio Power Amplifier Evaluation Module is a complete, low-power single-channel audio power amplifier. It consists of the TI TPA701 700-mW Low-Voltage Audio Power Amplifier IC in a very small MSOP package, along with a small number of other parts mounted on a circuit board that is approximately one and a quarter inches square (Figure 1–1). Figure 1–1.
TPA701 EVM Specifications 1.3 TPA701 EVM Specifications Supply voltage range, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 V to 5.5 V Supply current, IDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450 mA, max Continuous output power, PO: 8-Ω BTL, VDD = 5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700 mW Audio input voltage, VI . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2 Quick Start The steps in this chapter can be followed to quickly prepare the TPA701 MSOP audio amplifier EVM for use. Using the TPA701 MSOP EVM 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 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 - Follow these steps when using the TPA701 MSOP 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 these steps to use the TPA701 MSOP EVM stand-alone or when connecting it into existing circuits or equipment. Connections to the TPA701 MSOP 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 TPA701 IC, the evaluation module, the steps in the Quick-Start List, additional application information, and a parts list for the TPA701 MSOP evaluation module. Topic Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2 3.1 Precautions 3.2 The TPA701 MSOP Audio Power Amplifier Evaluation Module 3.3 Using The TPA701 MSOP 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 on-board soldered-in fuses and cause other damage to the platform, installed evaluation modules, and/or the power source.
The TPA701 MSOP Audio Power Amplifier Evaluation Module 3.2 The TPA701 MSOP Audio Power Amplifier Evaluation Module The TPA701 MSOP Audio Power Amplifier Evaluation Module is powered by a TPA701 700-mW Low-Power Audio Amplifier IC and includes an on-board shutdown control signal switch. The module can be used with the TI Plug-N-Play Audio Amplifier Evaluation Platform (Figure 3 –1) or wired directly into circuits or equipment.
The TPA701 MSOP Audio Power Amplifier Evaluation Module 3.2.1 TPA701 Audio Amplifier IC The TPA701 audio amplifier IC is a CMOS device intended for bridge-tied load (BTL) operation in battery-powered applications. It is supplied in a very small surface-mount package and has been designed to operate from low supply voltages (between approximately 2.5 V and 5.5 V) and deliver up to approximately 700 mW into an 8-Ω, BTL (Figure 3 – 4).
The TPA701 MSOP Audio Power Amplifier Evaluation Module The TPA701 amplifier IC, like most other amplifiers, exhibits its best distortion and noise performance at lower gain levels (see the TPA701 data sheet). Even so, the TPA701 at its highest gain setting has significantly less distortion than most low-cost speakers. Gain versus total harmonic distortion (THD) should be considered in each application.
Using The TPA701 MSOP EVM With the Plug-N-Play Evaluation Platform 3.3 Using The TPA701 MSOP EVM With the Plug-N-Play Evaluation Platform The TPA701 MSOP Audio Amplifier Evaluation Module was designed to be used with the TI Plug-N-Play Audio Amplifier Evaluation Platform. It simply plugs into socket U3 or U4. The following paragraphs provide additional details for using the TPA701 MSOP EVM with the platform. 3.3.
Using The TPA701 MSOP EVM With the Plug-N-Play Evaluation Platform 3.3.2 Signal Routing Signal flow on the platform is controlled by two signal routing switches, as shown in Figure 3 – 5. Figure 3–5. Platform Signal Routing and Outputs Off R Audio Input U1 Signal Conditioning U3 TPA701 Amplifier EVM R U4 TPA701 Amplifier EVM L + R – S2 L On – J7, J8, J9 Speaker Outputs L + U2 – U4 R U5 Stereo Headphone Amplifier R S3 + – J10 Headphone Output – GND L L + U5 3.3.2.
Using The TPA701 MSOP EVM With the Plug-N-Play Evaluation Platform Figure 3–6. Mute/Mode and Polarity Control VDD R3 240 Ω Polarity JP8 Lo J10 Headphone Jack R4 1 kΩ 3.3.3.2 R5 1 kΩ Hi SPK (U2–U4) JP6 Mode Mute U3, U4 Power Amplifiers Mute/Mode Select (JP6) A 3-pin jumper header (JP6) on the platform, functioning as a 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 3.3.3.
Power Requirements 3.3.4 Power Requirements The TPA701 MSOP Audio Power Amplifier Evaluation Module can operate from any voltage between approximately 2.5 V and 5.5 V; however, the TPA701 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 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 TPA701 power amplifier EVMs to operate in the highly-efficient bridge-tied load configuration. Figure 3–7.
Using The TPA701 MSOP EVM Stand-Alone 3.4 Using The TPA701 MSOP EVM Stand-Alone Using the TPA701 MSOP Audio Power Amplifier Evaluation Module stand-alone is much the same as using it with the platform. The same 2.5-V to 5.5-V power supply range and the isolated OUT+ and OUT– lines for BTL operation requirement exists. Note that the mute signal applied to the EVM shutdown pins must be able to supply enough current to overcome the pulldown resistors on the modules (20 kΩ || 20 kΩ for two EVMs). 3.4.
TPA701 MSOP Audio Power Amplifier Evaluation Module Parts List 3.5 TPA701 MSOP Audio Power Amplifier Evaluation Module Parts List Table 3–1. TPA701 MSOP EVM Parts List Ref. Description Size EVM Qty. Manufacturer/ Part Number A 1 Panasonic ECS-TOJY106R Murata GRM39-Y5V105Z10PT Digi-Key Number C3 Capacitor, 10 µF, 6.
