LM49150_14 Datasheet, PDF (1/31 Pages) Texas Instruments – Mono Class D Audio Subsystem with Earpiece Driver and Stereo Ground Referenced Headphone Amplifiers

LM49150, LM49150TLEVAL
www.ti.com
SNAS439B – AUGUST 2008 – REVISED MARCH 2009
LM49150
Mono Class D Audio Subsystem with Earpiece
Driver and Stereo Ground Referenced Headphone Amplifiers
Check for Samples: LM49150, LM49150TLEVAL
FEATURES
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•23 E²S Class D Amplifier
• Ground Referenced Headphone Outputs —
Eliminates Output Coupling Capacitors
• I²C Volume and Mode Control
• Mono Earpiece Amplifier
• Flexible Output for Speaker and Headphone
Output
• 20–Bump DSBGA Package
• Soft Enable Function
• “Click and Pop” Suppression Circuitry
• Thermal Shutdown Protection
• Low Supply Current
• Micro-Power Shutdown
APPLICATIONS
• Mobile Phones
• PDAs
• Portable Electronics
DESCRIPTION
The LM49150 is a fully integrated audio subsystem
designed for portable handheld applications such as
cellular phones. Part of TI's PowerWise™ product
family, the LM49150 consumes very low power in the
various modes of operation and still providing great
audio performance. The LM49150 combines a 1.25W
mono E²S (Enhanced Emission Suppression) class D
amplifier, 135mW Class AB earpiece amplifier,
42mW/channel stereo ground reference headphone
amplifiers, volume control, and mixing circuitry into a
single device.
The filterless class D amplifier delivers 1.25W into an
8Ω load with <1% THD+N with a 5V supply. The E²S
class D amplifier features a patented, ultra low EMI
PWM architecture that significantly reduces RF
emissions while preserving audio quality. The
42mW/channel headphone drivers feature TI’s
ground referenced architecture that creates a ground-
referenced output from a single supply, eliminating
the need for bulky and expensive DC-blocking
capacitors, saving space and minimizing cost.
The LM49150 features a fully differential mono input,
and two single-ended stereo inputs. The three inputs
can be mixed/multiplexed to either the speaker or
headphone amplifiers. Each input channel has an
independent, 32-step digital volume control. The
headphone output stage features an additional, 8-
step gain control, while the speaker output stage has
a selectable 6dB or 12dB gain. The mixer, volume
control and device mode select are controlled through
an I²C compatible serial interface.
The LM49150’s superior click and pop suppression
eliminates audible transients on power-up/down and
during shutdown. The LM49150 is available in a ultra-
small 20-bump DSBGA package (2.225mm X
2.644mm).
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
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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.
PowerWise is a trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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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 © 2008–2009, Texas Instruments Incorporated