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LM49251 Arkusz danych(PDF) 1 Page - Texas Instruments

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Numer części LM49251
Szczegółowy opis  Stereo Audio Subsystem with Class G Headphone Amplifier and Class D Speaker Amplifier with Speaker Protection
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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LM49251
www.ti.com
SNAS498A – FEBRUARY 2011 – REVISED APRIL 2013
LM49251
Stereo Audio Subsystem with Class G
Headphone Amplifier and Class D Speaker Amplifier with Speaker Protection
Check for Samples: LM49251
1
FEATURES
DESCRIPTION
The LM49251 is a fully integrated audio subsystem
2
Class G Ground Referenced Headphone
designed for portable handheld applications such as
Outputs
cellular phones. Part of TI’s PowerWise family of
E2S Class D Amplifier
products, the LM49251 utilizes a high efficiency class
No Clip Function
G headphone amplifier topology as well as a high
efficiency class D loudspeaker.
Power Limiter Speaker Protection
The headphone amplifiers feature TI’s class G ground
I2C Volume and Mode Control
referenced
architecture
that
creates
a
ground-
Advanced Click-and-Pop Suppression
referenced output with dynamic supply rails for
Micro-Power Shutdown
optimum efficiency. The stereo class D speaker
amplifier provides both a no-clip feature and speaker
APPLICATIONS
protection. The Enhanced Emission Suppression
(E2S) outputs feature a patented, ultra low EMI PWM
Feature Phones
architecture that significantly reduces RF emissions.
Smart Phones
The LM49251 features separate volume controls for
the
mono
and
stereo
inputs.
Mode
selection,
KEY SPECIFICATIONS
shutdown control, and volume are controlled through
Class G Headphone Amplifier, HPVDD = 1.8V,
an I2C compatible interface.
RL = 32Ω
Click
and
pop
suppression
eliminates
audible
IDDQHP: 1.15 mA (Typ)
transients on power-up/down and during shutdown.
Output Power, THD+N
≤ 1%: 20 mW (Typ)
The LM49251 is available in an ultra-small 30-bump
DSBGA package (2.55mmx3.02mm)
Stereo Class D Speaker Amplifier RL = 8Ω
Output Power, THD+N
≤ 1%, LSVDD = 5.0V:
1.37 W (Typ)
Output Power, THD+N
≤ 1%, LSVDD = 3.6V:
680 mW (Typ)
Efficiency: 90% (Typ)
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.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2011–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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