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TPA6139A2RGTR Scheda tecnica(PDF) 10 Page - Texas Instruments

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Il numero della parte TPA6139A2RGTR
Spiegazioni elettronici  25mW Headphone Amplifier
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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10
VDD
Internal VDD
AMP Enable
1.25 V
Bandgap
Comparator
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
10
TPA6139A2
SLOS700C – JANUARY 2011 – REVISED APRIL 2016
www.ti.com
Product Folder Links: TPA6139A2
Submit Documentation Feedback
Copyright © 2011–2016, Texas Instruments Incorporated
Feature Description (continued)
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.
9.4 Device Functional Modes
9.4.1 Internal Undervoltage Detection
The TPA6139A2 contains an internal precision band-gap reference voltage and a comparator used to monitor
the supply voltage, VDD. The internal VDD monitor is set at 2.8 V with 200-mV hysteresis.


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