The TPA6138A2 is a pop-free stereo headphone amplifier designed to allow the removal of the output dc-blocking capacitors for reduced component count and cost. The device is ideal for single-supply electronics where size and cost are critical design parameters.
Designed using TIs patented DirectPath™ technology, The TPA6138A2 is capable of driving 25 mW into a 32-Ω load with 3.3-V supply voltage. The device has differential inputs and uses external gain-setting resistors that supports a gain range of ±1 V/V to ±10 V/V. Gain can be configured individually for each channel. The device can also be configured as a second-order low-pass filter and is ideal for interfacing with PWM audio sources. Audio output compiles with ±8-kV IEC ESD protection, requiring just a simple resistor-capacitor ESD protection circuit. The TPA6138A2 has built-in active-mute control for pop-free audio on/off control. The TPA6138A2 has an external undervoltage detector that mutes the output when the power supply is removed, ensuring a pop-free shutdown.
Using the TPA6138A2 in audio products can reduce component count considerably compared to traditional headphone amplifiers. The TPA6138A2 does not require a split-rail power supply or a dc blocking capacitor. The TPA6138A2 integrates its own charge pump to generate a negative supply rail that provides a clean, pop-free ground-biased audio signal.
The TPA6138A2 is available in a 14-pin TSSOP.
|Part number||Order||Output power (W)||Analog supply (Min) (V)||Analog supply (Max) (V)||PSRR (dB)||Rating||Operating temperature range (C)||Headphone channels||Volume control||Shutdown current (ISD) (uA)||Architecture||Iq per channel (Typ) (mA)|
||0.25||3.6||3.6||80||Catalog||-40 to 85||Stereo||No||1||Class-AB||14|
||0.138||2.5||5.5||109||Catalog||-40 to 85||Stereo||Yes||0.4||Class-AB||2|
||0.025||2.3||5.5||100||Catalog||-40 to 85||Stereo||No||0.7||Class-AB||1.05|
||0.138||2.5||5.5||109||Catalog||-40 to 85||Stereo||No||0.08||Class-AB||4.2|
||0.025||5.5||2.3||100||Catalog||-40 to 85||Stereo||No||0.7||Class-AB||1.05|
||0.025||2.5||5.5||105||Catalog||-40 to 85||Stereo||Yes||1||Class-G||0.6|
||0.025||2.5||5.5||105||Catalog||-40 to 85||Stereo||No||1||Class-G||0.6|
||0.03||1.7||1.9||92||Catalog||-40 to 85||Stereo||Yes||1||Class-G||1.2|