TPA6135A2 Datasheet, PDF (1/22 Pages) Texas Instruments – DIRECTPATH™ Stereo Headphone Amplifier

TPA6135A2
www.ti.com .................................................................................................................................................. SLOS623A – FEBRUARY 2009 – REVISED APRIL 2009
DIRECTPATH™ Stereo Headphone Amplifier
With Differential Input and HI-Z Mode
FEATURES
1
•23 Patented DirectPath™ Technology Eliminates
Need for DC-Blocking Capacitors
– Outputs Biased at 0 V
– Excellent Low Frequency Fidelity
• Active Click and Pop Suppression
• HI-Z Output Mode
• 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: 0 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
APPLICATIONS
• Smart Phones / Cellular Phones
• Notebook Computers
• CD / MP3 Players
• Portable Gaming
DESCRIPTION
The TPA6135A2 (sometimes referred to as TPA6135)
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 0 dB or 6 dB.
The amplifier drives 25 mW into 16 Ω speakers from
a single 2.3 V supply. The TPA6135A2 (TPA6135)
provides a constant maximum output power
independent of the supply voltage, thus facilitating the
design for prevention of acoustic shock.
The TPA6135A2 (TPA6135) features HI-Z mode
which can set the outputs to a high impedance
configuration. The fully differential inputs reduce
system noise pickup between the audio source and
the headphone amplifier. The high power supply
noise rejection performance and differential
architecture provide 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 TPA6135A2 (TPA6135) 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
GAIN
HI-Z MODE
VBAT
INR+
INR-
OUTR
TPA6135A2
INL+
OUTL
INL-
EN
GAIN
HI-Z
VDD
HPVDD
CPP
SGND
PGND
HPVSS
CPN
1
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.
2
Windows Vista is a trademark of Microsoft Corporation.
3
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.
Copyright © 2009, Texas Instruments Incorporated