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The TPA6132A2 (sometimes referred to as the TPA6132) is a DirectPath® stereo headphone amplifier that eliminates the need for external DC blocking output capacitors. Differential stereo inputs and built-in resistors set the device gain, further reducing external component count. Gain can be selected from –6dB, 0dB, 3dB or 6dB. The amplifier uses a single 2.3V supply to deliver 25mW into a 16Ω speaker. The TPA6132A2 (TPA6132) provides a constant maximum output power independent of supply voltage, which facilitates acoustic shock-resistant designs.

The TPA6132A2 features fully differential inputs to reduce system noise pickup between the audio source and the headphone amplifier. High power supply noise rejection and differential architecture increase RF noise immunity. For single-ended input signals, connect INL+ and INR+ to ground.

The device has built-in pop suppression circuitry that completely eliminates crackling noise during turn-on and turn-off. The amplifier outputs are short-circuit and thermally protected and ±8kV HBM ESD protected, simplifying end equipment compliance with IEC 61000-4-2 ESD standards.

The TPA6132A2 operates from a single 2.3V to 5.5V supply with a typical supply current of 2.1mA. Shutdown mode reduces supply current to less than 1µA.

characteristic

With patented DirectPath™ technology, DC blocking capacitors are no longer required

Output Bias at 0V

Excellent low frequency fidelity

Active suppression of click/crack noise

2.1mA Supply Current (Typical)

Fully differential or single-ended input

Built-in resistors reduce component count

Improved system noise performance

2.3V to 5.5V Supply Provides Constant Maximum Output Power

Simplified design to prevent acoustic shocks

Improved RF noise immunity

Compliant with MicrosoftTM Windows VistaTM standard

High power supply noise rejection

100dB PSRR at 217Hz

90dB PSRR at 10kHz

Wide power supply range: 2.3V to 5.5V

Gain settings: –6dB, 0dB, 3dB and 6dB

Short circuit and thermal protection

±8kV HBM ESD protection on output

Available in small packages

16-pin, 3mm x 3mm ultra-thin QFN

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