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LM49150 Datasheet(PDF) 1 Page - Texas Instruments

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No. de pieza LM49150
Descripción Electrónicos  Mono Class D Audio Subsystem with Earpiece Driver and Stereo Ground Referenced Headphone Amplifiers
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LM49150 Datasheet(HTML) 1 Page - Texas Instruments

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LM49150, LM49150TLEVAL
www.ti.com
SNAS439C – AUGUST 2008 – REVISED MAY 2013
LM49150
Mono Class D Audio Subsystem with Earpiece
Driver and Stereo Ground Referenced Headphone Amplifiers
Check for Samples: LM49150, LM49150TLEVAL
1
FEATURES
APPLICATIONS
23
E2S Class D Amplifier
Mobile Phones
Ground Referenced Headphone Outputs —
PDAs
Eliminates Output Coupling Capacitors
Portable Electronics
I2C Volume and Mode Control
DESCRIPTION
Mono Earpiece Amplifier
The LM49150 is a fully integrated audio subsystem
Flexible Output for Speaker and Headphone
designed for portable handheld applications such as
Output
cellular phones. Part of TI's PowerWise™ product
20–Bump DSBGA Package
family, the LM49150 consumes very low power in the
various modes of operation and still providing great
Soft Enable Function
audio performance. The LM49150 combines a 1.25W
“Click and Pop” Suppression Circuitry
mono E2S (Enhanced Emission Suppression) class D
Thermal Shutdown Protection
amplifier,
135mW
Class
AB
earpiece
amplifier,
Low Supply Current
42mW/channel stereo ground reference headphone
amplifiers, volume control, and mixing circuitry into a
Micro-Power Shutdown
single device.
KEY SPECIFICATIONS
The filterless class D amplifier delivers 1.25W into an
8
Ω load with <1% THD+N with a 5V supply. The E2S
Output power at VDD = 5V:
class D amplifier features a patented, ultra low EMI
Speaker: RL = 8Ω BTL, THD+N ≤ 1%: 1.25W
PWM architecture that significantly reduces RF
(typ)
emissions
while
preserving
audio
quality.
The
42mW/channel
headphone
drivers
feature
TI’s
Headphone: RL = 32Ω SE, THD+N ≤ 1%:
ground referenced architecture that creates a ground-
42mW (typ)
referenced output from a single supply, eliminating
Earpiece: RL = 8Ω SE, THD+N ≤ 1%: 135mW
the need for bulky and expensive DC-blocking
(typ)
capacitors, saving space and minimizing cost.
Output power at VDD = 3.3V:
The LM49150 features a fully differential mono input,
Speaker: RL = 8Ω BTL, THD+N ≤ 1%:
and two single-ended stereo inputs. The three inputs
520mW (typ)
can be mixed/multiplexed to either the speaker or
headphone amplifiers. Each input channel has an
Headphone: RL = 32Ω BTL, THD+N ≤ 1%:
independent, 32-step digital volume control. The
42mW (typ)
headphone output stage features an additional, 8-
Earpiece: RL = 8Ω SE, THD+N ≤ 1%: 35mW
step gain control, while the speaker output stage has
(typ)
a selectable 6dB or 12dB gain. The mixer, volume
Output Offset
control and device mode select are controlled through
an I2C compatible serial interface.
LS Mode: 9mV (typ)
HP Mode: 1mV (typ)
The LM49150’s superior click and pop suppression
eliminates audible transients on power-up/down and
Earpiece: 1mV (typ)
during shutdown. The LM49150 is available in a ultra-
Single Supply Operation (VDD): 2.7 to 5.5V
small
20-bump
DSBGA
package
(2.225mm
X
I2C Single Supply Operation: 1.7 to 5.5V
2.644mm).
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
PowerWise is a trademark of Texas Instruments.
3
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2008–2013, 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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