lm49352rl National Semiconductor Corporation, lm49352rl Datasheet

lm49352rl

Manufacturer Part Number

lm49352rl

Description

Mono Class D Audio Codec Subsystem With Ground Referenced Headphone Amplifiers, Earpiece Driver, And Audio Dsp

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM49352RL.pdf (4 pages)

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Mono Class D Audio Codec Subsystem with Ground

Referenced Headphone Amplifiers, Earpiece Driver, and

Audio DSP

1.0 General Description

The LM49352 is a high performance mixed signal audio sub-

system. The LM49352 includes a high quality stereo DAC, a

high quality stereo ADC, a stereo headphone amplifier, which

supports True Ground operation, a low EMI Class D loud-

speaker amplifier, and an earpiece speaker amplifier. It com-

bines advanced audio processing, conversion, mixing, and

amplification in the smallest possible footprint while extending

the battery life of feature rich portable devices.

The LM49352 features dual bi-directional I

interfaces and an I

stereo DAC path features an SNR of 103dB with 24-bit 48 kHz

input. The headphone amplifier delivers 65mW

32Ω single-ended stereo load with less than 1% distortion

(THD+N) when HP_V

delivers up to 970mW into an 8Ω load with less than 1% dis-

tortion when LS_V

The LM49352 employs advanced techniques to extend bat-

tery life, to reduce controller overhead, to speed development

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

power amplifiers are designed specifically for mobile devices

and require minimal PCB area and external components.

Notice: This document is not a full datasheet. For more

information regarding this product or to order samples

please contact your local National Semiconductor sales

office or visit http://www.national.com/support/dir.html

2.0 Applications

■

3.0 Key Specifications

■

Boomer® is a registered trademark of National Semiconductor Corporation.

Smart Phones

Mobile Phones and VOIP Phones

Portable GPS Navigator and Portable Gaming Devices

Portable DVD/CD/AAC/MP3/MP4 Players

Digital Cameras/Camcorders

Class D Amplifier Efficiency

1% THD

at LS_V

at A_V

at HP_V

= 3.3V, 32Ω, 1% THD

= 5V, 8Ω, 1% THD

= 2.8V, Stereo 32Ω,

C compatible interface for control. The

= 4.2V.

= 2.8V. The loudspeaker amplifier

300727

S or PCM audio

65mW/ch (typ)

RMS

PRODUCT BRIEF

58mW (typ)

1.4W (typ)

93% (typ)

(typ) to a

LM49352

■

4.0 Features

■

SNR (Stereo DAC at 48kHz)

PSRR at 217 Hz, A_V

AUX)

Ultra efficient, spread spectrum Class D loudspeaker

amplifier that operates at 93% efficiency

Low voltage, true ground headphone amplifier operation

High performance 103dB SNR stereo DAC

High performance 97dB SNR stereo ADC

Up to 96kHz stereo audio playback

Up to 48kHz stereo recording

Dual bidirectional I

Read/write I

Flexible digital mixer with sample rate conversion

Sigma-delta PLL clock network that supports system

clocks up to 50MHz including 13MHz, 19.2MHz, and

26MHz

Dual stereo 5 band parametric equalizers

Cascadable DSP effects that allow stereo 10 band

parametric equalization

ALC/Limiter/Compressor on both DAC and ADC paths

Dedicated Earpiece Speaker Amplifier

Stereo auxiliary inputs and mono differential input

Differential microphone input with single-ended option

Automatic level control for digital audio inputs, mono

differential input, microphone input, and stereo auxiliary

inputs

Flexible audio routing from input to output

16 Step volume control for microphone with 2dB steps

32 Step volume control for auxiliary inputs in 1.5dB steps

4 Step volume control for class D loudspeaker amplifier

8 Step volume control for headphone amplifier

Micro-power shutdown mode

Available in the 3.3 x 3.3 mm 36 bump micro SMD package

at LS_V

C compatible control interface

= 4.2V, 8Ω, 1% THD

= 3.3V, 8Ω, 1% THD

S or PCM compatible audio interfaces

= 3.3V, (HP from

PRELIMINARY

April 16, 2009

www.national.com

970mW (typ)

590mW (typ)

103dB (typ)

100dB (typ)

Related parts for lm49352rl

lm49352rl Summary of contents

Page 1

... P at HP_V = 2.8V, Stereo 32Ω THD ■ LS_V = 5V, 8Ω, 1% THD LS DD Boomer® registered trademark of National Semiconductor Corporation. © 2009 National Semiconductor Corporation LM49352 PRODUCT BRIEF ■ LS_V LS ■ LS_V LS ■ SNR (Stereo DAC at 48kHz) ■ ...

Page 2

LM49352 Overview www.national.com FIGURE 1. LM49352 Block Diagram 2 30072777 ...

Page 3

... Connection Diagrams 36 Bump micro SMD Order Number LM49352RL See NS Package Number RLA36MMA Order Number Package 36 Bump micro LM49352RL SMDxt 36 Bump micro LM49352RLX SMDxt 30072711 LM49352RL Pinout Diagram Top View (Bump Side Down) Ordering Information Package DWG # Transport Media RLA36MMA 250 units on tape and reel ...

Page 4

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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