Texas Instruments TPA6139A2 EVM User Manual
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User's Guide

SLOU308 – January 2011

TPA6139A2 EVM

This section provides an overview of the Texas Instruments (TI) TPA6139A2 DirectPath™ stereo headphone amplifier evaluation module (EVM). It includes a brief description of the module and a list of EVM specifications.

 

 

Contents

 

1

Description ...................................................................................................................

2

2

EVM Specifications .........................................................................................................

2

3

Operation .....................................................................................................................

2

 

3.1

Quick-Start List for Stand-Alone Operation .....................................................................

2

4

Reference ....................................................................................................................

3

 

4.1

TPA6139A2EVM Schematic ......................................................................................

4

 

4.2

TPA6139A2EVM PCB Layers ....................................................................................

5

5

TPA6139A2EVM Bill of Materials .........................................................................................

6

 

 

List of Figures

1

TPA6139A2 EVM Top View ...............................................................................................

1

2

TPA6139A2 EVM Bottom View ...........................................................................................

2

3

TPA6139A2EVM Schematic...............................................................................................

4

4

Top Silkscreen...............................................................................................................

5

5

Bottom Silkscreen...........................................................................................................

5

 

 

List of Tables

1

EVM Specifications .........................................................................................................

2

2

TPA6139A2EVM Bill of Materials .........................................................................................

6

Figure 1. TPA6139A2 EVM Top View

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Description

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Figure 2. TPA6139A2 EVM Bottom View

1Description

The TPA6139A2 is a DirectPath™ stereo headphone amplifier capable of driving 2 Vrms into a 600Ω load and deliver up to 25 mW/Ch into 32 Ω with a 3.3V supply. The TPA6139A2 is designed using TI’s patented DirectPath™ technology and requires no output DC blocking capacitors.

The TPA6139A2 EVM is a complete, stand-aloneaudio board. It contains the TPA6139A2 TSSOP (PW) DirectPath™ stereo headphone amplifier. All components arePb-free.

2EVM Specifications

Table 1. EVM Specifications

Supply voltage range, VDD

3.0 V to 3.6 V

Supply current, IDD

130 m A, Typical

 

 

Continuous output power, PO, VDD = 3.3 V, 32 Ω, THD+N < 0.03%

25 m W

 

 

3Operation

This section describes how to operate the TPA6139A2EVM.

3.1Quick-StartList forStand-AloneOperation

Use the following steps when operating the TPA6139A2EVM stand alone or when connecting the EVM into an existing circuit.

3.1.1Power and Ground

1.Verify that the external power sources are set to OFF.

2.Connect the power supply to the EVM (J1) and set the power supply voltage between 3.0 V and 3.6 V

3.1.2Inputs and Outputs

3.1.2.1Audio

1.Verify that the audio source is set to the minimum level.

2.Connect the audio source to the inputs, LIN and RIN.

3.Connect a headset or other load to the headphone jack HPOUT.

2

TPA6139A2 EVM

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Reference

3.1.2.2Shutdown Controls

1.Shutdown is controlled by pushbutton S1. Press and hold S1 to place the TPA6139A2 in shutdown. Release S1 to reactivate the TPA6139A2.

3.1.3Gain Setting

The gain setting is programmed with the GAIN pin and is latched when the MUTE pin is set high. The default gain of the TPA6139A2EVM is set to 3.5dB using a 49.9 kΩ resistor (R2). The gain resistor can be adjusted to achieve a gain range from 0 dB to 20 dB. Refer to the datasheet for more details on gain settings.

3.1.4Power Up

1.Verify the correct connections as described in Section 3.1.1 andSection 3.1.2.

Verify the correct voltage setting of the power supply and turn ON the power supply. Proper operation of the EVM should begin.

2.Adjust the audio signal source as needed.

4Reference

This section includes the EVM schematic and board layout reference.

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Reference

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4.1TPA6139A2EVM Schematic

 

 

Figure 3. TPA6139A2EVM Schematic

 

 

 

4

TPA6139A2 EVM

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Reference

4.2TPA6139A2EVM PCB Layers

Figure 4. Top Silkscreen

Figure 5. Bottom Silkscreen

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TPA6139A2EVM Bill of Materials

 

 

www.ti.com

5

TPA6139A2EVM Bill of Materials

 

 

 

 

 

Table 2. TPA6139A2EVM Bill of Materials

 

 

 

 

 

 

 

Qty.

Reference

Description

SMD

Manufacturer

Part Number

Size

 

 

 

 

 

 

 

 

 

 

 

1

U1

Headphone AMP with 2 Vrms output TSSOP14-PWROHS

0603

TPA6139A2PW

 

 

 

 

 

 

 

1

LED1

LED, GREEN 2.0V SMD0805 ROHS

0805

LUMEX OPTO

SML-LXT0805GW-TR

 

 

 

 

 

 

2

TVS1, TVS2

TRANSIENT VOLTAGE SUPPRESSION SMA 100V 400W

0603

LITTLEFUSE

SMAJ100A

 

 

ROHS

 

 

 

 

 

 

 

 

 

2

C7, C9

CAP SMD0603 CERM 33PFD 50V 5% NPO ROHS

0603

MURATA

GRM1885C1H330JA01D

 

 

 

 

 

 

1

C8

CAP SMD0603 CERM 100PFD 50V 5% NPO ROHS

0603

MURATA

GRM1885C1H101JA01D

 

 

 

 

 

 

5

C1–C5

CAP SMD0603 CERM 1.0UFD 10V 10% X5R ROHS

0603

MURATA

GRM185R61A105KE36D

 

 

 

 

 

 

1

C6

CAP SMD0805 CERM 10UFD 16V 10% X5R ROHS

0603

MURATA

GRM21BR61C106KE15L

 

 

 

 

 

 

2

R4, R6

RESISTOR SMD0603 ZERO OHMS 1/10W ROHS

0603

STACKPOLE ELECTRONICS

RMCF0603ZT0R00

 

 

 

 

 

 

1

R1

RESISTOR SMD0603 330 OHMS 5% 1/10W ROHS

0603

PANASONIC

ERJ-3GEYJ331V

 

 

 

 

 

 

1

R2

RESISTOR SMD0805 49.9K OHMS 1% 1/8W THICK FILM

0805

VISHAY

CRCW080549K9FKEA

 

 

ROHS

 

 

 

 

 

 

 

 

 

3

R3, R8, R9

RESISTOR SMD0603 100K OHM 1% THICK FILM 1/10W

0603

PANASONIC

ERJ-3EKF1003

 

 

ROHS

 

 

 

 

 

 

 

 

 

1

J1

HEADER MALE 2PIN 100LS W/ FRICTION LOCK ROHS

 

MOLEX

22-23-2021

 

 

 

 

 

 

1

LIN

JACK, RCA 3-PINPCB-RABLACK ROHS

 

SWITCHCRAFT

PJRAN1X1U01X

 

 

 

 

 

 

1

RIN

JACK, RCA 3-PINPCB-RARED ROHS

 

SWITCHCRAFT

PJRAN1X1U03X

 

 

 

 

 

 

1

HPOUT

JACK MINI STEREO 3.5mm LIME GREEN W/SHUNTS

 

KYCON

STX-3150-5N-577C

 

 

ROHS

 

 

 

 

 

 

 

 

 

1

S1

SWITCH, MOM, 160G SMT 4X3MM ROHS

 

E-SWITCH

TL1015AF160QG

 

 

 

 

 

 

 

 

 

 

 

 

Components not assembled: C7, C9, R2, R5, R7, TVS1, and TVS2.

 

 

 

 

 

 

 

 

 

6

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Evaluation Board/Kit Important Notice

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLYand is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.

Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

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TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein.

Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/or safety programs, please contact the TI application engineer or visit www.ti.com/esh.

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FCC Warning

This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLYand is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to 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.

EVM Warnings and Restrictions

It is important to operate this EVM within the input voltage range of 3.0 V to 3.6 V and the output voltage range of 3.0 V to 3.6 V .

Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than 60°C. The EVM is designed to operate properly with certain components above 40°C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch.

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