Texas Instruments TPA152 User’s Guide

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TPA152 Audio Power Amplifier Evaluation Module

User’s Guide

1998 Mixed-Signal Products

TPA152

Audio Power Amplifier

Evaluation Module

User’ s Guide

SLOU019

June 1998

Printed on Recycled Paper

IMPORTANT NOTICE

T exas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify , before placing orders, that the information being relied on is current.

TI warrants performance of its semiconductor products and related software to the specifications applicable at the time of sale in accordance with TI’s standard warranty . T esting and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements.

Certain applications using semiconductor products may involve potential risks of death, personal injury , or severe property or environmental damage (“Critical Applications”).

TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS.

Inclusion of TI products in such applications is understood to be fully at the risk of the customer. Use of TI products in such applications requires the written approval of an appropriate TI officer . Questions concerning potential risk applications should be directed to TI through a local SC sales office.

In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards should be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. Nor does TI warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used.

Related Documentation From Texas Instruments

TI Plug-N-Play Audio Amplifier Evaluation Platform

number SLOU011) provides detailed information on the evaluation platform and its use with TI audio evaluation modules.

TP A152 75-mW STEREO AUDIO POWER AMPLIFIER

number SLOS210) This is the data sheet for the TPA152 audio amplifier integrated circuit.

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. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference.

Preface

(literature

Trademarks

TI is a trademark of Texas Instruments Incorporated.

Chapter Title—Attribute Reference

iii

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Running Title—Attribute Reference

Contents

1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Feature Highlights 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Description 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 TP A152 EVM Specifications 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Quick Start 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Precautions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Quick Start List for Platform 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Quick Start List for Stand-Alone 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Details 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Precautions 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 The TPA152 Audio Amplifier Evaluation Module 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.1 TPA152 Audio Amplifier IC 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.2 Module Gain 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.3 Shutdown 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Using The TPA152 EVM With The Plug-N-Play Evaluation Platform 3-6. . . . . . . . . . . . . . .

3.3.1 Installing and Removing EVM Boards 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3.2 Signal Routing 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3.3 Mute 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3.4 Power Requirements 3-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3.5 Inputs and Outputs 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Using The TPA152 EVM Stand-Alone 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4.1 TPA152 EVM Connected as a Stereo Headphone Amplifier 3-11. . . . . . . . . . . . . .

3.5 TPA152 Audio Amplifier Evaluation Module Parts List 3-12. . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Title—Attribute Reference

Running Title—Attribute Reference

Figures

1–1 The TI TPA152 Audio Amplifier Evaluation Module 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 Quick Start Platform Map 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 Quick Start Module Map 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 The TI Plug-N-Play Audio Amplifier Evaluation Platform 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–2 TPA152 EVM 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–3 TPA152 EVM Schematic Diagram 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–4 TPA152 Audio Amplifier IC 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–5 Platform Signal Routing and Outputs 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–6 Mute Polarity Control 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–7 Typical Headphone Plug 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–8 TPA152 EVM Connected as a Stereo Headphone Amplifier 3-11. . . . . . . . . . . . . . . . . . . . . . . .

T ables

2–1 Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA152 EVM 2-1. . . . .

2–2 Platform Jumper and Switch Settings for the TPA152 EVM 2-3. . . . . . . . . . . . . . . . . . . . . . . . .

3–1 TPA152 EVM Parts List 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1

Introduction

This chapter provides an overview of the Texas Instruments (TI) TPA152 Audio Amplifier Evaluation Module (SLOP123). 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 Features 1–3

1.2 Description 1–4

1.3 TP A152 EVM Specifications 1–4

Introduction

1-1

1-2

Introduction

1.1 Features

Features

The TI TPA152 Audio Amplifier Evaluation Module and the TI Plug-N-Play Audio Amplifier Evaluation Platform include the following features:

TPA152 Stereo Audio Power Amplifier Evaluation Module

Dual channel, single-ended operation

75 mW output power into 32 Ω at 5 V

4.5-V to 5.5-V operation

Very low distortion — THD+N is less than 0.005% into 10-kΩ loads at 1 kHz, and less than 0.01% from 20 Hz to 20 kHz

Low current consumption in shutdown/mute mode

Internal thermal and short-circuit protection

Internal pop reduction circuitry

Quick and Easy Configuration with the TI Plug-N-Play Audio Amplifier Evaluation Platform

Evaluation module is designed to simply plug into the platform, automatically making all signal, control, and power connections

Platform provides flexible power options

Jumpers on the platform select power and module control options

Switches on the platform route signals

Platform provides quick and easy audio input and output connections

Platform Power Options

On-board 9-V battery

External 5-V – 15-V (VCC) supply inputs

External regulated VDD supply input

Socket for on-board 5-V VDD voltage regulator EVM

On-board overvoltage and reverse polarity power protection

Platform Audio Input and Output Connections

Left and right RCA phono jack inputs

Miniature stereo phone jack input

Left and right RCA phono jack outputs

Left and right compression speaker terminal outputs

Miniature stereo headphone jack output

Introduction

1-3

Description

1.2 Description

The TPA152 Audio Power Amplifier Evaluation Module is a complete, low-power stereo audio power amplifier for high-fidelity line-level output and headphone applications. It consists of the TI TPA152 75-mW Stereo Audio Power Amplifier IC in a very small 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.The TI TPA152 Audio Amplifier Evaluation Module

Vdd GND

Vo1

GND

Vo2

INSTRUMENTS

SD IN1

GND

Shutdown

IN2 GND

TEXAS

TPA152 EVM

SLOP124

Single in-line header pins are mounted to the underside of the module circuit board to allow the EVM to be plugged into the TI Plug-N-Play Audio Amplifier Evaluation Platform, or to be wired directly into existing circuits and equipment when used stand-alone.

The platform has room for a single TPA152 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. Easy-to-use configuration controls allow the platform and EVMs to quickly model many possible end-equipment configurations.

There is nothing to build, nothing to solder, and nothing but the speakers included with the platform to “hook up.”

1.3 TPA152 EVM Specifications

Supply voltage range, V Supply current, I Continuous output power, P Audio input voltage, V Minimum load impedance, R

1-4

: 32-Ω, VDD=5 V: 75 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

80 mA, max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VDD + 3 Vpp, max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

32 Ω. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introduction

Chapter 2

Quick Start

The steps in this chapter can be followed to quickly prepare the TP A152 audio amplifier EVM for use. Using the TP A152 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. 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.

The platform switch and jumper settings shown in T able 2–1 are typical for the TP A152 EVM and will cause the TPA152 IC to mute when a plug is removed from platform headphone jack J10.

Table 2–1. Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA152 EVM

EVM JP6 JP7 JP8 S2 S3

TPA152 X Lo X Note 2 U5

Notes: 1) X = Don’t care

2) Set S2 to ON when signal conditioning board is installed in U1; set S2 to OFF when no signal conditioning board is installed.

T opic Page

2.1 Precautions 2–2

2.2 Quick Start List for Platform 2–3

2.3 Quick Start List for Stand-Alone 2–4

Quick Start

2-1

Precautions

2.1 Precautions

Power Supply Input Polarity and Maximum Voltage Always ensure that the polarity and voltage of the external power

connected to V input connector J6 are correct. Overvoltage or reverse-polarity

power input connector J1, J2, and/or VDD power

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.

Inserting or Removing EVM Boards Do not insert or remove EVM boards with power applied — damage

to the EVM board, the platform, or both may result.

Power

Input

Audio Input

Figure 2–1.

SOURCE

VCC

AC/DC

Right

Stereo

Left

1997

Quick Start Platform Map

JP3

JP2

JP1

VCC(J1)

AC/DC

(J2)

Batt

Signal Conditioning

****CAUTION**** Do not insert or remove EVM boards with power

TEXAS

INSTRUMENTS

Plug-N-Play Audio Amplifier Evaluation Platform SLOP097 Rev. C.1

VR1

LED1

VCC

applied

C1+

110

Off Pwr

ConditioningS2

GND

Audio Power Amps

OnOff

TP1

ICC JP4

IDD

JP5

U3 U4

U2-U4

Source

SUPPLY

HP(U5)

POWER

LED2

VDD

JP6

Polarity

Lo Hi

JP7

Out

Mode Mute

Spk(U2-U4)

JP8

C3 C2

HP Out

Right

Out

Stereo

VR2

In/Out

VDD

+–+– Right

Left

Headphone Output

J10

DC Power In/Out

Speaker Output

2-2

Quick Start

2.2 Quick Start List for Platform

Follow these steps when using the TP A152 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

Quick Start List for Platform

1) Ensure that all external power sources are set to power switch S1 is set to

OFF.

OFF

2) Install a TPA152 module in platform socket U5, taking care to align the module pins correctly.

3) Use switch S2 to select or bypass the signal conditioning EVM (U1)

4) Set control signal Polarity jumper JP7 to

Lo.

5) Set Hp source switch S3 to U5 to route the output signal to the headphone Jack (J10).

Table 2–2. Platform Jumper and Switch Settings for the TPA152 EVM

EVM JP6 JP7 JP8 S2 S3

TPA152 X Lo X Note 2 U5

Notes: 1) X = Don’t care

2) Set S2 to to

Power supply

6) Select and connect the power supply: a) Connect an external regulated power supply set to a voltage between

4.5 V and 5.5 V to platform V to observe marked polarity, or

OFF

when signal conditioning board is installed in U1; set S2

when no signal conditioning board is installed.

power input connector J6 taking care

and that the platform

b) Install a 5-V voltage regulator EVM (SLVP097 or equiv.) in platform

socket U6. Install a 9-V battery in B1 or connect a 7 V – 12 V power source to a platform V

power input J1 or J2 and jumper the ap-

propriate power input (see platform user’s guide).

Inputs and outputs

7) Ensure that signal source level is set to minimum.

8) Connect the audio source to left and right RCA phono jacks J3 and J5 or stereo miniature phone jack J4.

9) Connect 32-Ω headphones to headphone jack J10.

Power-up

10) Verify correct voltage and input polarity and set the external power supply to

ON.

If VCC and an on-board regulator EVM are used to provide VDD, set

platform power switch S1 to

ON.

Platform LED2 should light indicating the presence of VDD, and the evaluation modules installed on the platform should begin operation.

11) Adjust the signal source level as needed.

Quick Start

2-3

Quick Start List for Stand-Alone

2.3 Quick Start List for Stand-Alone

Follow these steps to use the TP A152 EVM stand-alone or when connecting it into existing circuits or equipment. Connections to the TPA152 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 Module Map

GND

Shutdown

Power supply

1) Ensure that all external power sources are set to

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

TEXAS

INSTRUMENTS

SD IN1

IN2 GND

TPA152 EVM

SLOP124

Vdd GND

Vo1

GND

Vo2

OFF.

2-4

3) Ensure that the signal source level is set to minimum.

4) Connect the audio source to the module IN1, IN2, and GND pins taking care to observe marked polarity.

5) Connect the Shutdown pin to V

6) Connect 32-Ω headphones to the module V

through a Normally Open switch.

1, VO2 pins through 33 µF

to 1000 µF output-coupling capacitors (figure 3–8) and return to the GND pin, or

7) For line output, connections to the V

1 and VO2 pins must be made

through 33 µF to 1000 µF output-coupling capacitors and returned to GND.

Power-up

8) Verify correct voltage and input polarity and set the external power supply to

ON.

The EVM should begin operation.

9) Adjust the signal source level as needed.

Quick Start

Chapter 3

Details

This chapter provides details on the TPA152 IC, the evaluation module, the steps in the Quick-Start List, additional application information, and a parts list for the TPA152 evaluation module.

Topic Page

3.1 Precautions 3–2

3.2 The TPA152 Audio Power Amplifier Evaluation Module 3–3

3.2.1 TPA152 Audio Amplifier IC 3–4

3.2.2 Module Gain 3–5

3.2.3 Mute 3–5

3.3 Using The TPA152 EVM With The Plug-N-Play Evaluation Platform 3–6

3.3.1 Installing and Removing EVM Boards 3–6

3.3.2 Signal Routing 3–7

3.3.3 Mute 3–8

3.3.4 Power Requirements 3–9

3.3.5 Inputs and Outputs 3–10

3.4 Using The TPA152 EVM Stand-Alone 3–11

3.4.1 TPA152 EVM Connected as a Stereo Headphone Amplifier 3–11

3.5 TPA152 Audio Power Amplifier Evaluation Module Parts List 3–12

Details

3-1

Precautions

3.1 Precautions

Power Supply Input Polarity and Maximum Voltage Always ensure that the polarity and voltage of the external power

connected to V 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.

Inserting or Removing EVM Boards Do not insert or remove EVM boards with power applied — damage

to the EVM board, the platform, or both may result.

Figure 3–1.The TI Plug-N-Play Audio Amplifier Evaluation Platform

JP3

JP2

JP1

SOURCE

Power

Input

Audio Input

AC/DC

VCC

Right

Stereo

Left

VCC(J1)

AC/DC

(J2)

Signal Conditioning

Batt

VR1

VCC

C1+

LED1

power input connector J1, J2, and/or VDD power

Off Pwr

ICC JP4

JP5

IDD

Audio Power Amps

U3 U4

OnOff

ConditioningS2

SUPPLY

POWER

LED2

VDD

VR2

In/Out

VDD

Right

Out

+–+– Right

Out

Left

Out

DC Power In/Out

Speaker Output

3-2

TEXAS

INSTRUMENTS

1997

Plug-N-Play Audio Amplifier Evaluation Platform SLOP097 Rev. C.1

****CAUTION**** Do not insert or remove EVM boards with power

applied

GND

TP1

U2-U4

Source

HP(U5)

JP6

Polarity

JP7

Mode Mute

Spk(U2-U4)

Out

JP8

C3 C2

HP Out

Left

Stereo

J10

Headphone Output

Details

The TPA152 Audio Power Amplifier Evaluation Module

3.2 The TPA152 Audio Power Amplifier Evaluation Module

The TPA152 Audio Power Amplifier Evaluation Module is powered by a TP A152 75-mW Stereo Audio Amplifier IC, includes a mute control signal input with on-board switch, and can drive either 32-Ω headphones or line-level outputs.

The evaluation 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 module has single in-line header connector pins mounted to the under side of the board. These pins allow the module to be plugged into the TI platform, which automatically makes all the signal input and output, power, and control connections to the module.

The module connection pins are on 0.1-inch centers to allow easy use with standard perf board and plug board-based prototyping systems. Or, the EVM can be wired directly into existing circuits and equipment when used stand-alone.

The module appears in Figure 3–2 and its schematic is shown in Figure 3–3.

Figure 3–2.TPA152 EVM

TEXAS

INSTRUMENTS

SD IN1

GND

Shutdown

IN2 GND

SLOP124

TPA152 EVM

Figure 3–3.TPA152 EVM Schematic Diagram

Audio Input 1

(VDD to Mute)

Audio Input 2

1 µF

R6 20 kΩ

1 µF

20 kΩ

1 µF

20 kΩ

C2, 5 pF

VO1

Mute

Bypass

IN 2–

C4, 5 pF

TPA152

Vdd GND

R2, 20 kΩ

IN 1–

GND

VO2

R4, 20 kΩ

Vo1

GND

Vo2

Output 1

1 µF

8 7

6 5

10 µF

GND

4.5 to 5.5 V

Output 2

Details

3-3

The TPA152 Audio Power Amplifier Evaluation Module

3.2.1 TPA152 Audio Amplifier IC

The TPA152 audio amplifier IC is a CMOS device intended primarily for high-performance line-level output and headphone driver applications. It is supplied in a very small surface-mount package and has been designed to operate from low supply voltages (between approximately 4.5 V and 5.5 V) and deliver up to approximately 75 mW into 32-Ω headphones with low distortion. As a line-level driver, distortion levels (THD+N) are below 0.01% into 10-kΩ loads across the audio band (20 Hz to 20 kHz) (Figure 3–4). T ypical applications include portable computers, desktop computers, personal audio, toys, games, and similar audio applications.

Figure 3–4.TPA152 Amplifier IC

Stereo Audio

Input

From System

Control

IN1–

8 3

BYPASS

IN2–

Mute

Control

–

Depop

Circuitry

–

VO1

VO2

RLR

Stereo

The IC includes two separate internal amplifiers, depop circuitry, and a common mute control. The load for each channel is connected between the

pin and GND through a coupling capacitor. For more information, see the

TPA152 amplifier IC data sheet, TI Literature Number SLOS210.

3-4

Details

3.2.2 Module Gain

The TPA152 Audio Power Amplifier Evaluation Module

The TP A152 evaluation module has a set gain of 1 (inverting) for each channel. However, the gain can be adjusted to a maximum of approximately 10 (inverting) by changing the value of feedback resistors (R2 and R4, Figure 3–3). Use the following equation to determine the value of R

–R

Gain

The TP A152 amplifier IC, as most other amplifiers, exhibits its best distortion and noise performance at lower gain levels. In addition, higher gain levels require a small compensation capacitor to ensure stability (see the TPA152 data sheet).

Gain versus total harmonic distortion (THD) and gain versus signal-to-noise ratio (SNR) should be considered in each application. Both the module input signal level and the TPA152 module gain should be adjusted to obtain the lowest overall distortion level for a particular overall gain. A quick rule of thumb (everything else being equal): the module input signal level should be as high as possible without clipping or overloading the TP A152 input, and the TP A152 gain should be kept as low as possible.

3.2.3 Mute

When the mute terminal of the TP A152 amplifier IC is taken high, the IC ceases operation. This is accomplished by applying a control signal to the module SD pin or by pressing the Shutdown switch, S1, on the module. When the control signal goes low or is removed (or the switch is released), amplifier operation resumes.

The Plug-N-Play platform can generate the mute signal for the module either when a plug is plug is

removed

inserted

, as selected by a platform jumper (JP7).

into the platform headphone output jack or when the

Details

3-5

Using The TP A152 EVM With the Plug-N-Play Evaluation Platform

3.3 Using The TPA152 EVM With the Plug-N-Play Evaluation Platform

The TP A152 Audio Amplifier Evaluation Module was designed to be used with the TI Plug-N-Play Audio Amplifier Evaluation Platform. It simply plugs into socket U5.

The following paragraphs provide additional details for using the TP A152 EVM with the platform.

3.3.1 Installing and Removing EVM Boards

TI Plug-N-Play evaluation modules use single-in-line header pins installed on the underside of the module circuit board to plug into sockets on the platform. The EVM pins and the platform sockets are keyed such that only the correct type of EVM can be installed in a particular socket, and then only with the proper orientation.

Evaluation modules are easily removed from the platform by simply prying them up and lifting them out of their sockets. Care must be taken, however, to prevent bending the pins.

3.3.1.1 EVM Insertion

3.3.1.2 EVM Removal

1) Remove all power from the evaluation platform

2) Locate socket U5 on the platform

3) Orient the module correctly

4) Carefully align the pins of the module with the socket pin receptacles

5) Gently press the module into place

6) Check to be sure that all pins are seated properly and that none are bent over

1) Remove all power from the evaluation platform

2) Using an appropriate tool as a lever, gently pry up one side of the module a short distance

3) Change to the opposite side of the module and use the tool to pry that side up a short distance

4) Alternate between sides, prying the module up a little more each time to avoid bending the pins, until it comes loose from the socket

3-6

5) Lift the EVM off the platform

Details

Using The TP A152 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

U2 Stereo Power

Amplifier EVM

Audio

Input

Signal

Conditioning

Off

Mono Power

Amplifier EVM

Mono Power

Amplifier EVM

TPA152

Headphone

Amplifier EVM

GND

–

J7, J8, J9

Speaker Outputs

– +

+ –

Headphone

Output

– +

J10

U2–U4

3.3.2.1 Signal Conditioning

The audio signal from the input jacks can be applied to the signal conditioning socket (U1) if an EVM is installed there, or socket U1 can be bypassed and the audio input signal applied directly to the inputs of the TP A152 power amplifiers.

Switch S2 selects or bypasses signal conditioning.

3.3.2.2 Headphone Output Jack

Switch S3 is the source select for the stereo headphone output jack, J10. The headphone jack is capacitively coupled (via 470 µF electrolytics) and can output either the signal from the the TP A152 headphone amplifier in socket U5, or the signal from power amplifiers installed in socket U2 or in sockets U3 and U4, as determined by the setting of headphone source select switch S3.

When S3 is set to the headphone amplifier position (U5), the headphone jack is connected to the headphone amplifier EVM output lines. When a plug is inserted into the jack, signals output through J10 are returned to platform ground. A switch inside the headphone jack produces a control signal that can be routed to the headphone amplifier socket to mute the TP A152 EVM when the headphone plug is removed.

Switch S3 connects the headphone jack to either the headphone amplifier platform socket (U5) or to the platform power amplifier sockets (U2 – U4).

Details

3-7

Using The TP A152 EVM With the Plug-N-Play Evaluation Platform

3.3.3 Mute

The TPA152 EVM is equipped with a mute control input pin. When this input is tied to V the EVM control input is tied to GND or allowed to float, amplifier operation resumes.

In typical applications, as often found in notebook computers, portable audio products, and such, the internal speakers mute when headphones are plugged into the headphone jack, or internal speakers mute when external speakers are connected. In applications using separate speaker and headphone amplifiers, the one not being used can be muted to conserve power.

3.3.3.1 Headphone Jack Control Signals

The platform headphone output jack (J10) contains an internal switch that changes the state of a pair of control lines when a plug is inserted or removed (Figure 3–6). Each control line is pulled down by a 1-kΩ resistor to ground (R4 and R5). The switch in the headphone jack pulls one line or the other up to V through a 240 Ω resistor (R3) depending on whether or not a plug is inserted in J10.

, the TP A152 amplifier IC on the module ceases operation. When

Figure 3–6.Mute Polarity Control

J10

Headphone

Jack

3.3.3.2 Mute Polarity Select (JP7)

A 3-pin jumper header (JP7) on the platform selects the mute control signal polarity by connecting either the active-high or the active-low line from the headphone jack to platform socket U5. The TP A152 EVM mutes when V applied to the module SD pin

T o mute the TP A152 amplifier module headphone jack, jumper JP7 to

To mute the TPA152 amplifier module headphone jack, jumper JP7 to

R3 240 Ω

R4 1 kΩ

R5 1 kΩ

Polarity

JP7

Mute

(U5)

when

a plug is inserted into the

until

a plug is inserted into the

(this is the typical setting).

Headphone

Amplifier

3-8

Details

3.3.4 Power Requirements

The TPA152 Audio Power Amplifier Evaluation Module can operate from a

voltage between approximately 4.5 V and 5.5 V.

The TI Plug-N-Play Audio Amplifier Evaluation Platform with a voltage regulator EVM installed on it can provide a regulated 5-V V wide variety of unregulated V and 12 V , including an on-board 9-V battery. Or , an external regulated power source can be used to supply V evaluation module installed on it.

The platform is equipped with overvoltage and reverse-polarity supply voltage input protection in the form of fused crowbar circuits.

VDD voltage applied to platform screw terminals J6 the absolute maximum rating for the TP A152 amplifier IC installed on the evaluation module (5.5 V), or damage to the IC may result. In no case should V to screw terminals J6 of the platform, or the power protection circuit on the V

VCC voltage applied to the platform voltage input specified for the voltage regulator module installed in socket U6 (12 V for the SLVP097), or damage to the voltage regulator module may result. In no case should V 15 V, or the overvoltage protection circuit on the V

voltage of the incorrect polarity or in excess of 6.1 V be applied

line will trip.

Power Requirements

supply from a

voltage inputs between approximately 5.5 V

voltage to the platform and the TPA152

MUST NOT

voltage applied to the platform exceed

exceed the maximum

bus will trip.

exceed

Details

3-9

Inputs and Outputs

3.3.5 Inputs and Outputs

The TI Plug-N-Play Audio Amplifier Evaluation Platform is equipped with several standard conectors for audio inputs and outputs.

3.3.5.1 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.

The platform audio signal input jacks (J3, J4, and J5) are of the closed-circuit type, grounding the signal input lines when no plugs are inserted.

3.3.5.2 Outputs

Output signals from the headphone amplifier (U5) leave the platform through a miniature (1/8″) stereo headphone jack (J10). Amplified audio output signals from the power amplifiers (U2 – U4) leave the platform through left and right RCA phono jacks (J7 and J9), left and right pairs of compression connectors for stripped speaker wires (J8), and optionally, through the headphone jack.

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 power amplifier EVMs to operate in the highly-efficient bridge-tied load configuration.

The headphone jack (J10) is capacitively coupled to source select switch S3, which connects J10 to the output lines of either the headphone amplifier socket or the power amplifier sockets (Figure 3–5). When the TPA152 output signal is routed to J10 by S3, signals output via J10 are returned to platform ground when a plug is inserted (Figure 3–7).

Figure 3–7.Typical Headphone Plug

Left Right GND

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Details

Using The TPA152 EVM Stand-Alone

3.4 Using The TPA152 EVM Stand-Alone

Using the TPA152 Audio Power Amplifier Evaluation Module stand-alone is much the same as using it with the platform. The same 4.5-V to 5.5-V power supply requirement exists.

Note that the mute signal applied to the EVM SD pin must be able to supply enough current to overcome the pulldown resistor on the module (20 kΩ).

3.4.1 TPA152 EVM Connected as a Stereo Headphone Amplifier

Figure 3–8.TPA152 EVM Connected as a Stereo Headphone Amplifier

5 VDC

Audio

Input

(Right)

Audio

Input (Left)

Mute

TEXAS

INSTRUMENTS

SD IN1

GND

Shutdown

IN2 GND

SLOP124

TPA152 EVM

Vdd GND

Vo1

GND

Vo2

33 µF – 1000 µF

Details

3-11

TP A152 Audio Power Amplifier Evaluation Module Parts List

3.5 TPA152 Audio Power Amplifier Evaluation Module Parts List

Table 3–1. TPA152 EVM Parts List

Ref. Description Size

C1, C3, C5, C6

C7 Capacitor, 10 µF, 6.3 V A 1 Panasonic

C2, C4 Capacitor, 5 pF, 6.3 V 0805 2 Panasonic

R1 – R6 Resistor, 20 kΩ, 1/8 W,5%1206 6 Panasonic

S1 Switch, momentary 1 Panasonic

U1 IC, TPA152, audio

PCB1 PCB, TP A152 EVM 1

NOTE: All items are SMD.

Capacitor, 1 µF, 6.3 V 1206 4 Murata

SOIC-81 TI

amplifier, 75 mW,

EVM

Qty.

Manufacturer/

Part Number

GRM42-6Y5V105Z16BL

ECS-TOJY106R

ECU-V1H050CCN

ERJ-8GEYJ203

P8048SCT-ND

TPA152

Vendor/Number

Newark 93F2254

Digi-Key PCS1106CT-ND

Digi-Key PCC050CNCT-ND

Digi-Key P20KECT-ND

Digi-Key P8048SCT-ND

3-12

Details

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Texas Instruments TPA152 User’s Guide

Specifications and Main Features

Frequently Asked Questions

User Manual