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TPA6139A2 EVM
User Manual
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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
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
3 TPA6139A2EVM Schematic............................................................................................... 4
4 Top Silkscreen............................................................................................................... 5
5 Bottom Silkscreen........................................................................................................... 5
List of Tables
2 TPA6139A2EVM Bill of Materials......................................................................................... 6
Figure 1. TPA6139A2 EVM Top View
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1
Description

1 Description

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-alone audio board. It contains the TPA6139A2 TSSOP (PW) DirectPath™ stereo headphone amplifier. All components are Pb-free.
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Figure 2. TPA6139A2 EVM Bottom View

2 EVM Specifications

Table 1. EVM Specifications
Supply voltage range, V Supply current, I Continuous output power, PO, VDD= 3.3 V, 32 Ω, THD+N < 0.03% 25 m W
DD
DD

3 Operation

This section describes how to operate the TPA6139A2EVM.

3.1 Quick-Start List for Stand-Alone Operation

Use the following steps when operating the TPA6139A2EVM stand alone or when connecting the EVM into an existing circuit.
3.1.1 Power 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
3.1.2 Inputs and Outputs
3.1.2.1 Audio
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.
3.0 V to 3.6 V 130 m A, Typical
2
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3.1.2.2 Shutdown Controls
1. Shutdown is controlled by pushbutton S1. Press and hold S1 to place the TPA6139A2 in shutdown. Release S1 to reactivate the TPA6139A2.
3.1.3 Gain 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.
3.1.4 Power Up
1. Verify the correct connections as described in Section 3.1.1 and Section 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.

4 Reference

This section includes the EVM schematic and board layout reference.
Reference
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Reference

4.1 TPA6139A2EVM Schematic

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Figure 3. TPA6139A2EVM Schematic
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4.2 TPA6139A2EVM PCB Layers

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Reference
Figure 4. Top Silkscreen
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Figure 5. Bottom Silkscreen
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TPA6139A2EVM Bill of Materials

5 TPA6139A2EVM Bill of Materials

Table 2. TPA6139A2EVM Bill of Materials
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Qty. Reference Description Manufacturer Part Number
1 U1 Headphone AMP with 2 Vrms output TSSOP14-PW ROHS 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 RESISTORSMD0603 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-PIN PCB-RA BLACK ROHS SWITCHCRAFT PJRAN1X1U01X 1 RIN JACK, RCA 3-PIN PCB-RA RED 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.
SMD Size
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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 ONLY and 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.
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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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This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and 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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