The TPA6132A2 (sometimes referred to as 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
is selectable at –6 dB, 0 dB, 3 dB or 6 dB. The amplifier drives 25 mW into 16 Ω speakers from a
single 2.3 V supply. The TPA6132A2 (TPA6132) provides a constant maximum output power independent
of the supply voltage, thus facilitating the design for prevention of acoustic shock.
The TPA6132A2 features fully differential inputs to reduce system noise pickup between
the audio source and the headphone amplifier. The high power supply noise rejection performance and
differential architecture provides increased RF noise immunity. For single-ended input signals,
connect INL+ and INR+ to ground.
The device has built-in pop suppression circuitry to completely eliminate disturbing pop
noise during turn-on and turn-off. The amplifier outputs have short-circuit and thermal-overload
protection along with ±8 kV HBM ESD protection, simplifying end equipment compliance to the IEC
61000-4-2 ESD standard.
The TPA6132A2 operates from a single 2.3 V to 5.5 V supply with 2.1 mA of typical supply
current. Shutdown mode reduces supply current to less than 1 µA.
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