lm4935rlx National Semiconductor Corporation, lm4935rlx Datasheet

lm4935rlx

Manufacturer Part Number

lm4935rlx

Description

Audio Sub-system With Dual-mode Stereo Headphone And Mono High Efficiency Loudspeaker Amplifiers And Multi-purpose Adc

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM4935RLX.pdf (113 pages)

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LM4935

Audio Sub-System with Dual-Mode Stereo Headphone &

Mono High Efficiency Loudspeaker Amplifiers and

Multi-Purpose ADC

1.0 General Description

The LM4935 is an integrated audio subsystem that supports

both analog and digital audio functions. The LM4935 in-

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

purpose SAR ADC, a stereo headphone amplifier, which

supports output cap-less (OCL) or AC-coupled (SE)modes of

operation, a mono earpiece amplifier and a mono high effi-

ciency loudspeaker amplifier. It is designed for demanding

applications in mobile phones and other portable devices.

The LM4935 features a bi-directional I

full range audio and an I

control. The stereo DAC path features an SNR of 88 dB with

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

delivers at least 33 mW

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

3.3V. The mono earpiece amplifier delivers at least 115

tion (THD+N) when A_V

plifier delivers up to 600 mW into an 8Ω load with less than

1% distortion when LS_V

LS_V

pose SAR ADC for housekeeping duties such as battery and

temperature monitoring. This can also be used for analog

volume control of the output stages and can trigger interrupt

events.

The LM4935 employs advanced techniques to reduce power

consumption, to reduce controller overhead to speed devel-

opment 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

n Smartphones

n Mobile Phones and Multimedia Terminals

n PDAs, Internet Appliances and Portable Gaming

n Portable DVD/CD/AAC/MP3 Players

n Digital Cameras/Camcorders

3.0 Key Specifications

n P

Boomer

RMS

HP (AC-COUP)

HP (OCL)

is a registered trademark of National Semiconductor Corporation.

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

= 5.0V. The LM4935 also contains a general pur-

LS_V

A_V

= 5V, 8Ω, 1% THD

= 4.2V, 8Ω, 1% THD

= 3.3V, 8Ω, 1% THD

A_V

= 3.3V, 32Ω, 1% THD

RMS

C or SPI compatible interface for

= 3.3V, 32Ω, 1% THD

= 3.3V. The mono speaker am-

to a 32Ω single-ended stereo

= 3.3V and up to 1.3W when

S serial interface for

DS201341

900 mW

600 mW

33 mW

31 mW

1.3 W

n Shutdown Current

n PSRR

n SNR (Stereo DAC to AUXOUT)

n SNR (Mono ADC from Cell Phone In)

n SNR (Aux In to Headphones)

4.0 Features

n 18-bit stereo DAC

n 16-bit mono ADC

n 12-bit 4 input multipurpose SAR ADC

n 8 kHz to 48 kHz stereo audio playback

n 8 kHz to 48 kHz mono recording

n 1 Hz to 13.888 kHz sample rate on all 4 SAR channels

n Bidirectional PCM/I

n Sigma-Delta PLL for operation from any clock at any

n Low power clock network operation if 12 MHz system

n Read/write I

n 33mW stereo headphone amplifier at 3.3V

n OCL or AC-coupled headphone operation

n Automatic headphone & microphone detection

n Support for internal and external microphones

n Automatic gain control for microphone input

n High efficiency BTL 8Ω amplifier, 600 mW

n 115 mW earpiece amplifier at 3.3V

n Differential audio I/O for external cellphone module

n Mono differential auxiliary output

n Stereo auxiliary inputs

n Differential microphone input for internal microphone

n Flexible audio routing from input to output

n 32 Step volume control for mixers with 1.5 dB steps

n 16 Step volume control for microphone in 2 dB steps

n Programmable sidetone attenuation in 3 dB steps

n DC Volume Control

n Two configurable GPIO ports

n Programmable voltage triggers on SAR channels

n Multi-function IRQ output

n Micro-power shutdown mode

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

sample rate

clock is available

package

BB_V

D_V

LS_V

Supply Voltage Range

& PLL_V

217 Hz, A_V

& A_V

= 1.8V to 4.5V,

C or SPI compatible control interface

= 2.7V to 5.5V

S compatible audio interface

= 2.7V to 4.5V

= 3.3V, (Headphone)

January 2006

www.national.com

3.3V

88 dB (typ)

98 dB (typ)

90 dB (typ)

1.1 µA

60 dB

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