Click-and-Pop

Suppression

HPVDD

HPVSS

HPVDD

HPVSS

Charge

Pump

INR+

INR-

INL+

INL-

OUTL

OUTR

CPP

CPN

HPVSS

G0

EN

Thermal

Protection

Gain

Select

G1

VDD

Supply

Control

PGND

SGND

HPVDD

Resistor

Array

1 F

m

1 F

m

2.2 F

m

Short-Circuit

Protection

Resistor

Array

HPVDD

TPA6132A2

SLOS597A – DECEMBER 2008 – REVISED OCTOBER 2014

www.ti.com

8 Detailed Description

8.1 Overview

The TPA6132A2 is a DirectPath™ stereo headphone amplifier that requires no output DC blocking capacitors

and is capable of delivering 25m-W/Ch into16-

Ω speakers. 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 and thermal-

overload protection.

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.

Differential stereo inputs and built-in resistors set the device gain, reducing external component count. The

TPA6132A2 has four gain settings which are controlled with pins G0 and G1. The combination of these pins set

the device to –6-dB, 0-dB, 3-dB or 6-dB gain.

The TPA6132A2 operates from a single 2.3-V to 5.5-V supply with 2.1 mA of typical supply current, as it uses a

built-in charge pump to generate a negative voltage supply for the headphone amplifiers. Shutdown mode

reduces supply current to less than 1

μA

8.2 Functional Block Diagram

10

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