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SLOS597 – DECEMBER 2008
25-mW DIRECTPATH™ STEREO HEADPHONE AMPLIFIER WITH POP SUPPRESSION
1
FEATURES
DESCRIPTION
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 (TPA6132) 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 (TPA6132) 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.
OUTR+
OUTR-
CODEC
OUTL+
OUTL-
ENABLE
GAIN0
GAIN1
VBAT
INL+
INL-
SGND
EN
G0
G1
VDD
HPVDD
CPP
CPN
PGND
INR+
INR-
TPA6132A2
OUTL
OUTR
•
Patented DirectPath™ Technology Eliminates
Need for DC-Blocking Capacitors
– Outputs Biased at 0 V
– Excellent Low Frequency Fidelity
•
Active Click and Pop Suppression
•
2.1 mA Typical Supply Current
•
Fully Differential or Single-Ended Inputs
– Built-In Resistors Reduces Component
Count
– Improves System Noise Performance
•
Constant Maximum Output Power from 2.3 V
to 5.5 V Supply
– Simplifies Design to Prevent Acoustic
Shock
•
Improved RF Noise Immunity
•
Microsoft
TM
Windows Vista
TM
Compliant
•
High Power Supply Noise Rejection
– 100 dB PSRR at 217 Hz
– 90 dB PSRR at 10 kHz
•
Wide Power Supply Range: 2.3 V to 5.5 V
•
Gain Settings: –6 dB, 0 dB, 3 dB, and 6 dB
•
Short-Circuit and Thermal-Overload Protection
•
±8 kV HBM ESD Protected Outputs
•
Small Package Available
– 16-Pin, 3 mm × 3 mm Thin QFN
23
APPLICATIONS
•
•
•
•
Smart Phones / Cellular Phones
Notebook Computers
CD / MP3 Players
Portable Gaming
HPVSS
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2
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DirectPath is a trademark of Texas Instruments.
Windows Vista is a trademark of Microsoft Corporation.
Copyright © 2008, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
