LM49450SQXSLASHNOPB.A中文资料德州仪器数据手册PDF规格书

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.