Datasheet

R3
C1
RIGHT
INPUT
+
–
LEFT
INPUT
LEFT OUTPUTRIGHT OUTPUT
3.3-V Supply
C2
C1
R3
R2
R2
R1R1
R3
+
–
C2
R3
R1
R1
1mF
R2
C1
R2
C1
1mF
1mF
Linear
Low-Dropout
Regulator
R11
R12
10mF
System Supply
C3
C3
C3
C3
Headphone
Driver
Headphone
Driver
Short-Circuit
Protection
Click and Pop
Suppression
Bias
Circuitry
+INR
–INR
TPA6138A2
–INL
OUTL
UVP
+INL
GND
VDD
CPCN
MUTE
VSS
GND
OUTR
TPA6138A2
www.ti.com SLOS704A –JANUARY 2011– REVISED MAY 2011
LAYOUT RECOMMENDATIONS
A proposed layout for the TPA6138A2 can be seen in the TPA6138A2EVM User's Guide, and the Gerber files
can be downloaded from http://www.ti.com. To access this information, open the TPA6138A2 product folder and
look in the Tools and Software folder.
GAIN-SETTING RESISTORS
The gain-setting resistors, R
IN
and R
fb
, must be placed close to pins 13 and 17, respectively, to minimize
capacitive loading on these input pins and to ensure maximum stability of the TPA6138A2. For the
recommended PCB layout, see the TPA6138A2EVM User's Guide.
APPLICATION CIRCUIT
R1 = 15 kΩ, R2 = 30 kΩ, R3 = 43 kΩ, C1 = 47 pF, C2 = 180 pF
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Product Folder Link(s): TPA6138A2