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TPA6139A2PWR Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce TPA6139A2PWR
Description  DirectPath??25-mW Headphone Amplifier With Programmable-Fixed Gain
Download  22 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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OPAMP
Co
Mute Circuit
Output
MUTE
9-12 V
+
+
+
-
TPA6139A2
Output
3.3 V
-
Conventional solution
TPA 6139 A 2 Solution
VDD
VSS
GND
VDD
VDD/2
GND
DirectPath
MUTE
TPA6139A2
www.ti.com
SLOS700B – JANUARY 2011 – REVISED JUNE 2012
APPLICATION INFORMATION
LINE DRIVER AMPLIFIERS
Single-supply line-driver amplifiers typically require dc-blocking capacitors. The top drawing in Figure 9 illustrates
the conventional line-driver amplifier connection to the load and output signal.
DC blocking capacitors are often large in value, and a mute circuit is needed during power up to minimize click
and pop. The output capacitor and mute circuit consume PCB area and increase cost of assembly, and can
reduce the fidelity of the audio output signal.
Figure 9. Conventional and DirectPath Line Driver
The DirectPath™ amplifier architecture operates from a single supply but makes use of an internal charge pump
to provide a negative voltage rail.
Combining the user-provided positive rail and the negative rail generated by the IC, the device operates in what
is effectively a split supply mode.
The output voltages are now centered at zero volts with the capability to swing to the positive rail or negative rail.
Combining this with the built-in click and pop reduction circuit, the DirectPath™ amplifier requires no output dc
blocking capacitors.
The bottom block diagram and waveform of Figure 9 illustrate the ground-referenced line-driver architecture. This
is the architecture of the TPA6139A2.
Copyright © 2011–2012, Texas Instruments Incorporated
Submit Documentation Feedback
9
Product Folder Link(s) :TPA6139A2


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