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.
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
2EVM 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
3Operation
This section describes how to operate the TPA6139A2EVM.
3.1Quick-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.
3.1.1Power 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.
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 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.
4Reference
This section includes the EVM schematic and board layout reference.
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
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The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all
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FCC Warning
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
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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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