TPA6139A2 Datasheet, PDF (12/22 Pages) Texas Instruments – DirectPath™ 25-mW Headphone Amplifier With Programmable-Fixed Gain

TPA6139A2
SLOS700B – JANUARY 2011 – REVISED JUNE 2012
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CAPACITIVE LOAD
The TPA6139A2 has the ability to drive a high capacitive load up to 220 pF directly. Higher capacitive loads can
be accepted by adding a series resistor of 47 Ω or larger for the line driver output.
LAYOUT RECOMMENDATIONS
A proposed layout for the TPA6139A2 can be seen in the TPA6139A2EVM User's Guide (SLOU248), and the
Gerber files can be downloaded from http://focus.ti.com/docs/toolsw/folders/print/TPA6139A2evm.html. To
access this information, open the TPA6139A2 product folder and look in the Tools and Software folder.
Ground traces are recommended to be routed as a star ground to minimize hum interference. VDD, VSS
decoupling capacitors and the charge pump capacitors should be connected with short traces.
PIN COMPATIBLE WITH THE DRV612
The TPA6139A2 stereo Headphone amplifier is pin compatible with the DRV612 . A single PCB layout can
therefore be used with stuffing options for different board configurations.
APPLICATION CIRCUIT
IN_LEFT
OUT_LEFT
MUTE
2
1
C11 2.2 mF
1
2
C1 ^{1 mF}
GND
U11
1 _{-IN_L}
2 _{OUT_L}
3 _GND
4 _MUTE
5 _VSS
6 _CN
7 _NC
-IN_R ¹⁴
OUT_R ¹³
GAIN ¹²
GND ¹¹
VDD ¹⁰
CP ⁹
NC ⁸
2
1
C12 2.2 mF
1
2
R11 49 kW
1
C15
2
1 mF
GND
IN_RIGHT
OUT_RIGHT
+3.3V
IN_LEFT
2
1
C21 2.2 mF
U21
2
1
C14 uF1
2
1
C22 2.2 mF
IN_RIGHT
OUT_LEFT
MUTE
GND
1 _{OUT_L}
OUT_R ¹²
2 _GND
3 _GND
TPA6139A2RGT ^{GAIN 11}
GND ¹⁰
4 _MUTE
VDD ⁹
GND
OUT_RIGHT
+3.3V
C25
1 mF
R21
49 kW
C23
1 mF
2
1
GND GND
C24 1 mF
GND
Figure 11. Single Ended Input and Output, Gain Set to –1.5x
12
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