LM49350RL+ National Semiconductor, LM49350RL+ Datasheet

LM49350RL+

Manufacturer Part Number

LM49350RL+

Description

Manufacturer

National Semiconductor

Datasheets

1.LM49350RL.pdf (104 pages)

2.LM49350RL.pdf (104 pages)

Specifications of LM49350RL+

Notes

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Date_code

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LM49350

High Performance Audio Codec Sub-System with a

Ground-Referenced Stereo Headphone Amplifier & an

Ultra Low EMI Class D Loudspeaker Amplifier with Dual

1.0 General Description

The LM49350 is a high performance audio subsystem that

supports both analog and digital audio functions. The

LM49350 includes a high quality stereo DAC, a high quality

stereo ADC, a stereo headphone amplifier that supports

ground referenced output cap-less operation, a dual mode

earpiece speaker amplifier, and a low EMI Class D loud-

speaker amplifier. It is designed for demanding applications

in mobile phones and other portable devices.

The LM49350 features dual bi-directional I

interfaces for full range audio and an I

for control. The stereo DAC path features an SNR of 96dB

with 24-bit 48 kHz input. The headphone amplifier delivers

69mW

than 1% distortion (THD+N) when A_V

piece speaker amplifier delivers 58mW

bridged-tied load with less than 1% distortion (THD+N) when

A_V

495mW into an 8Ω load with less than 1% distortion when

LS_V

The LM49350 employs advanced techniques to reduce pow-

er consumption, to reduce controller overhead, to speed de-

velopment time, and to eliminate click and pop. Boomer audio

power amplifiers were designed specifically to provide high

quality output power with a minimal amount of external com-

ponents. It is therefore ideally suited for mobile phone and

other low voltage applications where minimal power con-

sumption, PCB area and cost are primary requirements.

2.0 Applications

■

3.0 Key Specifications

■

Boomer® is a registered trademark of National Semiconductor Corporation.

■

S/PCM Digital Audio Interfaces

Smart Phones

Mobile Phones and VOIP Phones

Portable GPS Navigator and Portable Gaming Devices

Portable DVD/CD/AAC/MP3/MP4 Players

Digital Cameras/Camcorders

D_V

LS_V

I/O_V

Supply Voltage Range

RMS

at A_V

at LS_V

at A_V

= 3.3V. The loudspeaker amplifier delivers up to

= 3.3V and up to 1.2W when LS_V

(typ) to a 32Ω single-ended stereo load with less

= 1.7V to 2.0V

and A_V

= 1.6V to 4.5V

= 3.3V, Stereo 32Ω, 1% THD 69mW/ch (typ)

= 3.3V, 32Ω BTL, 1% THD

= 5V, 8Ω, 1% THD

= 4.2V, 8Ω, 1% THD

= 3.3V, 8Ω, 1% THD

= 2.7V to 5.5V

C compatible interface

RMS

201941

= 3.3V. The ear-

S or PCM audio

(typ) to a 32Ω

= 5.0V.

825mW (typ)

495mW (typ)

58mW (typ)

1.2W (typ)

■

4.0 Features

■

SNR (Stereo DAC at 48kHz)

SNR (Stereo ADC at 48kHz)

Shutdown Current

PSRR at 217 Hz, A_V

AUX)

High performance 96dB SNR stereo DAC

High performance 94dB SNR stereo ADC

Up to 192kHz stereo audio playback

Up to 48kHz stereo recording

Dual bidirectional I

Read/write I

Flexible digital mixer with sample rate conversion

Dual sigma-delta PLLs for operation from any clock at any

sample rate

Digital 3D stereo enhancement

Dual 5 band parametric equalizers

Cascadable DSP effects that allow 10 band parametric

equalization

ALC/Compressor/Limiter on both DAC and ADC paths

Ultra low EMI, Class D loudspeaker amplifier with spread

spectrum control

Ground referenced output cap-less headphone amplifier

operation

Earpiece speaker amplifier with reduced power

consumption mode for mono differential line out

applications

Stereo auxiliary inputs or mono differential input

Differential stereo microphone inputs with single-ended

option

Automatic level control for digital audio inputs, stereo

microphone inputs, and stereo auxiliary inputs

Flexible audio routing from input to output

16 Step volume control for microphones with 2dB steps

32 Step volume control for auxiliary inputs in 1.5dB steps

Micro-power shutdown mode

Available in the 3.5 x 3.5 mm 36 bump micro SMD package

C compatible control interface

S or PCM compatible audio interfaces

= 3.3V, (HP from

September 23, 2008

www.national.com

2.3µA (typ)

96dB (typ)

94dB (typ)

97dB (typ)

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