LM49100_14 Datasheet, PDF (1/33 Pages) Texas Instruments – Mono Class AB Audio Sub-System with a True- Ground Headphone Amplifier

LM49100
www.ti.com
SNAS392E – JUNE 2007 – REVISED SEPTEMBER 2007
LM49100
Mono Class AB Audio Sub-System with a True-
Ground Headphone Amplifier
Check for Samples: LM49100
FEATURES
1
•2 Mono and stereo inputs
• Thermal Overload Protection
• True-ground Headphone Drivers
• I²C Control Interface
• Input mute attenuation
• 2nd Stage headphone attenuator
• 32-step digital volume control
• 10 Operating Modes
• Minimum external components
• Click and Pop suppression
• Micro-power shutdown
• Available in space-saving 3mm x 3mm 25
bump GR package
• RF Suppression
APPLICATIONS
• Mobile Phones
• PDAs
• Laptops
• Portable Electronics
DESCRIPTION
The LM49100 is a fully integrated audio subsystem capable of delivering 1.275W of continuous average power
into a mono 8Ω bridged-tied load (BTL) with 1% THD+N and with a 5V power supply. The LM49100 also has a
stereo true-ground headphone amplifier capable of 50mW per channel of continuous average power into a 32Ω
single-ended (SE) loads with 1% THD+N.
The LM49100 has three input channels. One pair of SE inputs can be used with a stereo signal. The other input
channel is fully differential and may be used with a mono input signal. The LM49100 features a 32-step digital
volume control and ten distinct output modes. The mixer, volume control, and device mode select are controlled
through an I²C compatible interface.
Thermal overload protection prevent the device from being damaged during fault conditions. Superior click and
pop suppression eliminates audible transients on power-up/down and during shutdown.
■ Power Output at V_DD = 5V:
Loudspeaker (LS):
R_L = 8Ω, THD+N ≤ 1%
Headphone (V_DDHP = 2.8V):
R_L = 32Ω, THD+N ≤ 1%
■ Shutdown current
Table 1. Key Specifications
VALUE
1.275
50
0.01
UNIT
W
mW
µA
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
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 © 2007, Texas Instruments Incorporated