LM49450_15 Datasheet, PDF (1/42 Pages) Texas Instruments – Boomer I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-System with Ground Referenced Headphone Amplifier, 3D Enhancement, and Headphone Sense

LM49450
www.ti.com
SNAS440D – FEBRUARY 2008 – REVISED MAY 2013
LM49450 Boomer ™ I²S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-
System with Ground Referenced Headphone Amplifier, 3D Enhancement, and Headphone
Sense
Check for Samples: LM49450
FEATURES
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•23 24–Bit Stereo DAC
• Stereo Filterless Class D Operation
• Selectable Spread Spectrum Mode Reduces
EMI
• Ground Referenced Headphone Amplifiers
with 100dB SNR
• I²S Compatible Audio Interface
• Audio Sample Rates up to 192kHz
• TI’s 3D Enhancement
• 32-Step Digital Volume Control
• I²C-Compatible Control Interface
• Headphone Sense Input
• Stereo Analog Line Inputs
• Output Short Circuit Protection
• Thermal Overload Protection
• Minimum External Components
• Click and Pop Suppression
• Micro-Power Shutdown
• Available in Space-Saving 32-Pin WQFN
Package
KEY SPECIFICATIONS
• SNR at Headphone Output: 102dBA (typ)
• Speaker Amplifier Efficiency at 3.6V,
650mW/Channel into 8Ω: 87% (typ)
• Speaker Amplifier Efficiency at 5V,
1.1W/Channel into 8Ω: 80% (typ)
• Quiescent Power Supply Current Line Inputs:
– Speaker Mode at LSVDD = 3.6V: 7.5mA
(typ)
– Headphone Mode at HPVDD = 2.5V: 5.3mA
(typ)
• Output Power/Channel Speaker at LSV_DD = 5V:
– R_L = 4Ω, THD+N ≤ 10%: 2.5W (typ)
– R_L = 8Ω, THD+N ≤ 1%: 1.25W (typ)
• Headphone at HPV_DD = 2.5V:
– R_L = 16Ω, THD+N ≤ 1%: 34mW (typ)
– R_L = 32Ω, THD+N ≤ 1%: 36mW (typ)
• PSRR at 1kHz
– Speaker Mode: 67dB ( typ)
– Headphone Mode: 77dB (typ)
• Shutdown current: 0.02μA (typ)
APPLICATIONS
• Portable Media Players
• Portable Navigation Devices
• Multi-Media Monitors
• Laptops
• Portable Gaming Devices
• Mobile Handsets
DESCRIPTION
The LM49450 is a fully integrated audio subsystem
designed for portable media player applications. The
LM49450 combines a 24-bit I²S digital-to-analog
converter (DAC), 2.5W/channel stereo Class D
speaker drivers, 36mW stereo ground referenced
headphone drivers, volume control, and TI’s unique
3D sound enhancement into a single device.
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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.
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 © 2008–2013, Texas Instruments Incorporated