1FEATURES
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

APPLICATIONS
• Portable Media Players
• Portable Navigation Devices
• Multi-Media Monitors
• Laptops
• Portable Gaming Devices
• Mobile Handsets

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 LSVDD = 5V:
– RL = 4Ω, THD+N ≤ 10%: 2.5W (typ)
– RL = 8Ω, THD+N ≤ 1%: 1.25W (typ)
• Headphone at HPVDD = 2.5V:
– RL = 16Ω, THD+N ≤ 1%: 34mW (typ)
– RL = 32Ω, THD+N ≤ 1%: 36mW (typ)
• PSRR at 1kHz
– Speaker Mode: 67dB ( typ)
– Headphone Mode: 77dB (typ)
• Shutdown current: 0.02μA (typ)

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.