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TPA6138A2PWR
DIRECTPATH? Headphone Driver with Adjustable Gain 14-TSSOP -40 to 85
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VDD
MUTE
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OUTL+
OUTL-
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TPA6138A2SLOS704B –JANUARY 2011–REVISED AUGUST 2015
TPA6138A2 DirectPath™ Headphone Driver With Adjustable Gain Features 3 DescriptionThe TPA6138A2isa pop-free stereo headphone Stereo DirectPath™ Headphone Amplifier amplifier designedto allow the removalof the output– 40 mW Into32Ω With 3.3-V Supply dc-blocking capacitors for reduced component count Low THD+N< 0.01%at10 mW Into 32Ω and cost. The device is ideal for single-supply
electronics where size and cost are critical design• High SNR, >90 dB parameters.• Differential Input and Single-Ended Output
Designed using TI’s patented DirectPath™• Adjustable Gainby External Gain-Setting technology, The TPA6138A2is capableof driving 25Resistors mW intoa 32-Ω load with 3.3-V supply voltage. The• Configurableasa Second-Order Low-Pass Filter device has differential inputs and uses external gain- Ideal for PWM Audio Sources setting resistors that supportsa gain rangeof±1 V/V ±10 V/V. Gain can be configured individually for• Low DC Offset,<1 mV each channel. The device can also be configuredas• Ground-Referenced Outputs Eliminate DC- a second-order low-pass filter and is ideal forBlocking Capacitors interfacing with PWM audio sources. Audio output Reduce Board Area compiles with ±8-kV IEC ESD protection, requiring
justa simple resistor-capacitor ESD protection circuit.– Reduce Component Cost The TPA6138A2 has built-in active-mute control for– Improve THD+N Performance pop-free audio on/off control. The TPA6138A2 hasan– No Degradationof Low-Frequency Response external undervoltage detector that mutes the output
Dueto Output Capacitors when the power supplyis removed, ensuringa pop-
free shutdown.• Short-Circuit Protection Click- and Pop-Reduction Circuitry Using the TPA6138A2in audio products can reduce
component count considerably compared to• External Undervoltage Mute traditional headphone amplifiers. The TPA6138A2• Active Mute Control for Pop-Free Audio On/Off does not requirea split-rail power supplyora dcControl blocking capacitor. The TPA6138A2 integrates its Space-Saving TSSOP Package own charge pumpto generatea negative supply rail
that providesa clean, pop-free ground-biased audio
signal.
2 ApplicationsThe TPA6138A2is availableina 14-pin TSSOP.• LCD and PDP TV Blu-ray Disc™, DVD Players
Device Information(1) Set-Top Boxes• Mini/Micro Combo Systems• Sound Cards (1) Forall available packages, see the orderable addendumat• Laptops the endofthe datasheet.
Simplified Diagram
