Texas Instruments TPA6139A2 EVM User Manual
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
SLOU308–January 2011 TPA6139A2 EVM
Submit Documentation Feedback
© 2011, Texas Instruments Incorporated
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.
www.ti.com
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
TPA6139A2 EVM SLOU308–January 2011
© 2011, Texas Instruments Incorporated
Submit Documentation Feedback
www.ti.com
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
SLOU308–January 2011 TPA6139A2 EVM
Submit Documentation Feedback
© 2011, Texas Instruments Incorporated
3
Loading...