lm49370rl National Semiconductor Corporation, lm49370rl Datasheet

lm49370rl

Manufacturer Part Number

lm49370rl

Description

Audio Sub-system With An Ultra Low Emi, Spread Spectrum, Class D Loudspeaker Amplifier, A Dual-mode Stereo Headphone Amplifier, And A Dedicated Pcm Interface For Bluetooth Transceivers

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM49370RL.pdf (100 pages)

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LM49370

Audio Sub-System with an Ultra Low EMI, Spread

Spectrum, Class D Loudspeaker Amplifier, a Dual-Mode

Stereo Headphone Amplifier, and a Dedicated PCM

Interface for Bluetooth Transceivers

1.0 General Description

The LM49370 is an integrated audio subsystem that supports

both analog and digital audio functions. The LM49370 in-

cludes a high quality stereo DAC, a mono ADC, a stereo

headphone amplifier, which supports output cap-less (OCL)

or AC-coupled (SE) modes of operation, a mono earpiece

amplifier, and an ultra-low EMI spread spectrum Class D

loudspeaker amplifier. It is designed for demanding applica-

tions in mobile phones and other portable devices.

The LM49370 features a bi-directional I

directional PCM interface for full range audio on either inter-

face. The LM49370 utilizes an I

for control. The stereo DAC path features an SNR of 85 dB

with an 18-bit 48 kHz input. In SE mode the headphone am-

plifier delivers at least 33 mW

stereo load with less than 1% distortion (THD+N) when

A_V

115mW

tortion (THD+N) when A_V

amplifier delivers up to 490mW into an 8Ω load with less than

1% distortion when LS_V

LS_V

The LM49370 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.

Smart phones

Mobile Phones and Multimedia Terminals

PDAs, Internet Appliances and Portable Gaming

Portable DVD/CD/AAC/MP3 Players

Digital Cameras/Camcorders

Shutdown Current

PSRR

HP (AC-COUP)

HP (OCL)

= 3.3V. The mono earpiece amplifier delivers at least

( LS_V

(LS_V

RMS

= 5.0V.

to a 32Ω bridged-tied load with less than 1% dis-

(217 Hz, LS_V

(A_V

= 4.2V, 8Ω, 1% THD)

= 3.3V, 8Ω, 1% THD)

= 5V, 8Ω, 1% THD)

= 3.3V, 32Ω, 1% THD)

= 3.3V and up to 1.2W when

= 3.3V)

C or SPI compatible interface

= 3.3V. The mono speaker

RMS

to a 32Ω single-ended

S interface and a bi-

201917

900 mW

490 mW

33 mW

31 mW

0.8 µA

1.2 W

70 dB

■

4.0 Features

■

SNR

Spread Spectrum Class D architecture reduces EMI

Mono Class D 8Ω amplifier, 490 mW at 3.3V

OCL or AC-coupled headphone operation

33mW stereo headphone amplifier at 3.3V

115 mW earpiece amplifier at 3.3V

18-bit stereo DAC

16-bit mono ADC

8 kHz to 192 kHz stereo audio playback

8 kHz to 48 kHz mono recording

Bidirectional I

Bidirectional PCM compatible audio interface for

Bluetooth transceivers

Sigma-Delta PLL for operation from any clock at any

sample rate

Digital 3D Stereo Enhancement

FIR filter programmability for simple tone control

Low power clock network operation if a 12 MHz or 13 MHz

system clock is available

Read/write I

Automatic headphone & microphone detection

Support for internal and external microphones

Automatic gain control for microphone input

Differential audio I/O for external cellphone module

Mono differential auxiliary output

Stereo auxiliary inputs

Differential microphone input for internal microphone

Flexible audio routing from input to output

32 Step volume control for mixers in 1.5 dB steps

16 Step volume control for microphone in 2 dB steps

Programmable sidetone attenuation in 3 dB steps

Two configurable GPIO ports

Multi-function IRQ output

Micro-power shutdown mode

Available in the 4 x 4 mm 49 bump micro SMDxt package

S-PCM Bridge with sample rate conversion

DAC

ADC

(AUX IN to Loudspeaker)

(Aux In to Headphones)

(Stereo DAC to AUXOUT)

(Mono ADC from Cell Phone In)

C or SPI compatible control interface

S compatible audio interface

February 2007

www.national.com

90 dB (typ)

85 dB (typ)

90 dB (typ)

98 dB (typ)

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