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Texas Instruments TPA701 manual

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Table of contents for the manual

  • Page 1

    November 1998 Mixed-Signal Products User ’ s Guide SLOU026A[...]

  • Page 2

    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. All product[...]

  • Page 3

    iii Chapter Title—Attribute Reference Preface Related Documentation From T exas Instruments TI Plug-N-Play Audio Amplifier Evaluation Platform (literature number SLOU01 1) provides detailed information on the evaluation platform and its use with TI audio evaluation modules. TP A701 700-mW LOW-VOL T AGE AUDIO POWER AMPLIFIER (literature number SLO[...]

  • Page 4

    iv[...]

  • Page 5

    Running Title—Attribute Reference v Chapter Title—Attribute Reference Contents 1 Introduction 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Feature Highlights 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[...]

  • Page 6

    Running Title—Attribute Reference vi Figures 1–1 The TI TP A701 MSOP Audio Amplifier Evaluation Module 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1 Quick Start Platform Map 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2 Quick Start Module Map 2-4 . . . . . .[...]

  • Page 7

    1-1 Introduction Introduction This chapter provides an overview of the T exas Instruments (TI  ) TP A701 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. T opic Page 1.1 Feature Highlights 1–2 . . . . .[...]

  • Page 8

    Feature Highlights 1-2 Introduction 1.1 Feature Highlights The TI TP A701 MSOP Audio Amplifier Evaluation Module and the TI Plug-N-Play Audio Amplifier Evaluation Platform include the following features: TP A701 Low-V oltage Audio Power Amplifier Evaluation Module Single channel, bridge-tied load (BTL) 3.3-V and 5-V operation 700-mW output power in[...]

  • Page 9

    Description 1-3 Introduction 1.2 Description The TP A701 MSOP Audio Power Amplifier Evaluation Module is a complete, low-power single-channel audio power amplifier . It consists of the TI TP A701 700-mW Low-V oltage 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 app[...]

  • Page 10

    TP A701 EVM Specifications 1-4 Introduction 1.3 TP A701 EVM Specifications Supply voltage range, V DD 2.5 V to 5.5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Supply current, I DD 450 mA, max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Co[...]

  • Page 11

    2-1 Quick Start Quick Start The steps in this chapter can be followed to quickly prepare the TP A701 MSOP audio amplifier EVM for use. Using the TP A701 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. [...]

  • Page 12

    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. Overvoltage or reverse-polarity power applied to these terminals can open on-board soldered-i[...]

  • Page 13

    Quick Start List for Platform 2-3 Quick Start 2.2 Quick Start List for Platform Follow these steps when using the TP A701 MSOP EVM with the TI Plug-N-Play Audio Amplifier Evaluation Platform (see the platform user ’s guide, SLOU01 1, for additional details). Numbered callouts for selected steps are shown in Figure 2–1 and details appear in Chap[...]

  • Page 14

    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 A701 MSOP EVM stand-alone or when connecting it into existing circuits or equipment. Connections to the TP A701 MSOP module header pins can be made via individual sockets, wire-wrapping, or soldering to the pins, either on the top [...]

  • Page 15

    3-1 Details Details This chapter provides details on the TP A701 IC, the evaluation module, the steps in the Quick-Start List, additional application information, and a parts list for the TP A701 MSOP evaluation module. T opic Page 3.1 Precautions 3–2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 The [...]

  • Page 16

    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. Overvoltage or reverse-polarity power applied to these terminals can open on-board soldered-in fu[...]

  • Page 17

    The TP A701 MSOP Audio Power Amplifier Evaluation Module 3-3 Details 3.2 The TP A701 MSOP Audio Power Amplifier Evaluation Module The TP A701 MSOP Audio Power Amplifier Evaluation Module is powered by a TP A701 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[...]

  • Page 18

    The TP A701 MSOP Audio Power Amplifier Evaluation Module 3-4 Details 3.2.1 TP A701 Audio Amplifier IC The TP A701 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 a[...]

  • Page 19

    The TP A701 MSOP Audio Power Amplifier Evaluation Module 3-5 Details The TP A701 amplifier IC, like most other amplifiers, exhibits its best distortion and noise performance at lower gain levels (see the TP A701 data sheet). Even so, the TP A701 at its highest gain setting has significantly less distortion than most low-cost speakers. Gain versus t[...]

  • Page 20

    Using The TP A701 MSOP EVM With the Plug-N-Play Evaluation Platform 3-6 Details 3.3 Using The TP A701 MSOP EVM W ith the Plug-N-Play Evaluation Platform The TP A701 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 paragraph[...]

  • Page 21

    Using The TP A701 MSOP EVM With the Plug-N-Play Evaluation Platform 3-7 Details 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 U1 Signal Conditioning On Off U5 Stereo Headphone Amplifier S2 R L R L L U5 U2 – U4 S3 J10 Head[...]

  • Page 22

    Using The TP A701 MSOP EVM With the Plug-N-Play Evaluation Platform 3-8 Details Figure 3–6. Mute/Mode and Polarity Control J10 Headphone Jack R3 240 Ω R4 1 k Ω R5 1 k Ω JP8 JP6 U3, U4 Power Amplifiers Lo Hi Polarity Mode Mute V DD SPK (U2–U4) 3.3.3.2 Mute/Mode Select (JP6) A 3-pin jumper header (JP6) on the platform, functioning as a SPDT[...]

  • Page 23

    Power Requirements 3-9 Details 3.3.4 Power Requirements The TP A701 MSOP Audio Power Amplifier Evaluation Module can operate from any voltage between approximately 2.5 V and 5.5 V ; however , the TP A701 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), t[...]

  • Page 24

    Inputs and Outputs 3-10 Details 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 TP A701 power amplifier EVMs to operate in the highly-ef ficient bri[...]

  • Page 25

    Using The TP A701 MSOP EVM Stand-Alone 3-1 1 Details 3.4 Using The TP A701 MSOP EVM Stand-Alone Using the TP A701 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 t[...]

  • Page 26

    TP A701 MSOP Audio Power Amplifier Evaluation Module Parts List 3-12 Details 3.5 TP A701 MSOP Audio Power Amplifier Evaluation Module Parts List T able 3–1. TP A701 MSOP EVM Parts List Ref. Description Size EVM Qty . Manufacturer/ Part Number Digi-Key Number C3 Capacitor , 10 µ F , 6.3 V A 1 Panasonic ECS-TOJY106R Digi-Key PCS1 106CT -ND C1, C2,[...]