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User's Guide
SLOU305A – November 2010 – Revised January 2011
TPA6138A2 EVM
1
1
2
3
4
3
4
1
2
1
Contents
Introduction
Operation
..................................................................................................................
.....................................................................................................................
Reference
....................................................................................................................
TPA6138A2EVM Bill of Materials
.........................................................................................
List of Figures
TPA6138EVM Top View
...................................................................................................
TPA6138EVM Bottom View
...............................................................................................
Top Layer
....................................................................................................................
Bottom Layer
................................................................................................................
List of Tables
TPA6138A2EVM Bill of Materials
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Introduction
This section provides an overview of the Texas Instruments (TI) TPA6138A2 DirectPath™ stereo headphone amplifier evaluation module (EVM). It includes a brief description of the module and a list of
EVM specifications.
Figure 1. TPA6138EVM Top View
DirectPath is a trademark of Texas Instruments.
SLOU305A – November 2010 – Revised January 2011
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TPA6138A2 EVM 1
Introduction www.ti.com
Figure 2. TPA6138EVM Bottom View
1.1
Description
The TPA6138A2 is a DirectPath™ stereo headphone amplifier capable of delivering 25 mW/Ch into 32 Ω and requires no output DC blocking capacitors.
The TPA6138A2 EVM is a complete, stand-alone audio board. It contains the TPA6138A2 TSSOP
DirectPath™ stereo headphone amplifier.
1.2
EVM Specifications
Supply voltage range, V
DD
Supply current, I
DD
Continuous output power, P
O
, V
DD
= 3.3 V, 32 Ω , THD+N < 1 %
3 V to 3.6 V
0.5 A, maximum
20 mW
2 TPA6138A2 EVM SLOU305A – November 2010 – Revised January 2011
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2 Operation
This section describes how to operate the TPA6138A2EVM.
Operation
2.1
Quick-Start List for Stand-Alone Operation
Use the following steps when operating the TPA6138A2EVM stand alone or when connecting the EVM into an existing circuit.
2.1.1
Power and Ground
1. Verify that the external power sources are set to OFF.
2. Set the power supply voltage between 3 V and 3.6 V. When connecting the power supply to the EVM, first connect the ground connection to the GND connector, and then connect the positive supply to the
V
DD connector. Verify that the connections are made to the correct banana jacks.
2.1.2
Inputs and Outputs
2.1.2.1
Audio
1. Verify that the audio source is set to the minimum level.
2. Connect the audio source to the inputs, LIN and RIN. Shunt JP1 and JP2 for single-ended input.
3. Connect a headset or other load to the headphone jack.
2.1.2.2
Shutdown Controls
1. Shutdown is controlled by pushbutton S1. Press and hold S1 to place the TPA6138A2 in shutdown.
Release S1 to reactivate the TPA6138A2.
2.1.3
Power Up
1. Verify the correct connections as described in the
and
sections.
2. Verify the correct voltage setting of the power supply and turn ON the power supply. Proper operation of the EVM should begin.
3. Adjust the audio signal source as needed.
SLOU305A – November 2010 – Revised January 2011
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TPA6138A2 EVM 3
Reference
3 Reference
This section includes the EVM schematic, board layout reference, and parts list.
3.1
TPA6138A2EVM Schematic www.ti.com
+ + + +
4 TPA6138A2 EVM
Shield
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3.2
TPA6138A2EVM PCB Layers
Figure 3. Top Layer
Reference
Figure 4. Bottom Layer
SLOU305A – November 2010 – Revised January 2011
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TPA6138A2 EVM 5
TPA6138A2EVM Bill of Materials
4 TPA6138A2EVM Bill of Materials
www.ti.com
Qty. Manfacturer Part No.
1 TPA6138A2PW
1 SML-LXT0805GW-TR
4 GRM1885C1H470JA01D
1 GRM1885C1H101JA01D
2 CC0805JRNP09BN181
2 C1608C0G1H102J
1 C0603C104K8RACTU
4 C1608X7R1C105K
4 EEE-1HS2R2SR
1 08056C106KAT2A
2 RC0603JR-0710RL
1 ERJ-3EKF3920V
1 ERJ-3GEYJ103V
4 RMCF0603FT15K0
4 RC0603FR-0743KL
4 RC0603FR-0730KL
4 RMCF0603JT100K
4 PBC02SAAN
1 PJRAN1X1U01X
1 PJRAN1X1U03X
1 STX-3150-5N-577C
1 5000
1 5001
3 5003
1 TL1015AF160QG
3 SPC02SYAN
4 PMS 440 0025 PH
4 2027
Ref Des
U1
3.3V
C9, C10, C11, C12
C13
C7, C8
C19, C20
C2
C15, C17, C18
C3, C4, C5, C6
C1
R22, R23
R1
R21
R6, R7, R9, R11
R16, R17, R18, R19
R8, R10, R15, R20
R2, R3, R4, R5
J1, JP1, JP2, JP3
LIN
RIN
HPOUT
UVP
GND
HPL, HPR, MUTE
S1
JP1, JP2, JP3
NA
NA
Table 1. TPA6138A2EVM Bill of Materials
Description
DIRECTPATH 2V AUDIO LINE DRIVER W/ADJ GAIN
TSSOP14-PW ROHS
LED, GREEN 2.0V SMD0805 ROHS
CAP SMD0603 CERM 47PFD 50V 5% COG ROHS
CAP SMD0603 CERM 100PFD 50V 5% COG ROHS
CAP SMD0805 CERM 180PFD 50V 5% NPO ROHS
CAP SMD0603 CERM 1000PFD 50V 5% COG ROHS
CAP SMD0603 CERM 0.1UFD 10V 5% X7R ROHS
CAP SMD0603 CERM 1.0UFD 16V 10% X7R ROHS
CAP ALUM-ELECT SMD-VSA 2.2UFD 50V 20% ROHS
CAP SMD0805 CERM 10UFD 6.3V X7R 10% ROHS
RESISTOR SMD0603 THICK FILM 10 OHMS 5% 1/10W ROHS
RESISTOR SMD0603 392 OHM 1% THICK FILM 1/10W ROHS
RESISTOR SMD0603 10K 5% 1/10W ROHS
RESISTOR SMD0603 15.0K OHMS 1% 1/10W ROHS
RESISTOR SDM0603 20.0K OHM 1% THICK FILM 1/16W
ROHS
RESISTOR SMD0603 THICK FILM 30.0K 1% 1/10W ROHS
RESISTOR SMD0603 100K OHMS 5% 1/10W ROHS
HEADER THRU MALE 2 PIN 100LS GOLD ROHS
JACK, RCA 3-PIN PCB-RA BLACK ROHS
JACK, RCA 3-PIN PCB-RA RED ROHS
JACK MINI STEREO 3.5mm LIME GREEN W/SHUNTS ROHS
PC TESTPOINT, RED, ROHS
PC TESTPOINT BLACK ROHS
PC TESTPOINT ORANGE ROHS
SWITCH, MOM, 160G SMT 4X3MM ROHS
SHUNT, BLACK AU FLASH 0.100LS
4-40 SCREW, STEEL 0.250 IN
STANDOF ,4-40 0.5IN 3/16IN DIA ALUM RND F-F
Manufacturer
TEXAS INSTRUMENTS
LUMEX OPTO
MURATA
MURATA
YAGEO
TDK CORP.
KEMET
TDK
PANASONIC
AVX
YAGEO
PANASONIC
PANASONIC
STACKPOLE ELECTRONICS
YAGEO
YAGEO
STACKPOLE ELECTRONICS
SULLINS
SWITCHCRAFT
SWITCHCRAFT
KYCON
KEYSTONE ELECTRONICS
KEYSTONE ELECTRONICS
KEYSTONE ELECTRONICS
E-SWITCH
SULLINS
BUILDING FASTENERS
KEYSTONE ELECTRONICS
6 TPA6138A2 EVM SLOU305A – November 2010 – Revised January 2011
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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
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This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
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EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of 0 V to 3 V and the output voltage range of 0 V to 3.3 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 85°C. The EVM is designed to operate properly with certain components above 85°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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