TPA6138A2

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SLOS704B – JANUARY 2011 – REVISED AUGUST 2015

8 Parameter Measurement Information

All parameters are measured according to the conditions described in Specifications.

9 Detailed Description

9.1 Overview

The TPA6138A2 is a DirectPath™ stereo headphone amplifier that requires no output DC blocking capacitors

and is capable of delivering 25m-W into a 32-

Ω load. The device has built-in pop suppression circuitry to

completely eliminate pop noise during turn- on and turn-off. The amplifier outputs have short-circuit protection.

The TPA6138A2 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.

The TPA6138A2 gain is controlled by external resistors Rin and Rfb, see the Gain-Setting Resistor Ranges

section for recommended values.

The TPA6138A2 operates from a single 3-V to 3.6-V supply, as it uses a built-in charge pump to generate a

negative voltage supply for the headphone amplifiers.

The TPA6138A2 features an external undervoltage protection which must be set according to TPA6138A2 UVP

Operation.

The TPA6138A2 can also be used as a standard operational amplifier (op amp), this makes possible to configure

the device as a second-order low-pass filter to remove out-of-band noise.

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