TPA6132A2_17 Datasheet, PDF (10/28 Pages) Texas Instruments – 25-mW DirectPath Stereo Headphone Amplifier With Pop Suppression

TPA6132A2
SLOS597A – DECEMBER 2008 – REVISED OCTOBER 2014
8 Detailed Description
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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
VDD
INL-
INL+
INR-
INR+
G0
G1
Resistor
Array
HPVDD
HPVSS
Supply
Control
Short-Circuit
Protection
HPVDD
2.2 mF
PGND
OUTL
Resistor
Array
Gain
Select
HPVDD
Thermal
Protection
HPVSS
HPVDD
Click-and-Pop
Suppression
Charge
Pump
SGND
HPVSS
1 mF
EN
OUTR
CPP
1 mF
CPN
10
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