LM49352 - Mono Class D Audio Codec Subsytem with Ground Referenced Headphone Amplifiers, Earpiece Driver, and Audio DSP

LM49352 - Mono Class D Audio Codec Subsytem with Ground Referenced Headphone Amplifiers, Earpiece Driver, and Audio DSP from the PowerWise® Family

Datasheet	Packaging	Samples & Pricing	Eval. Boards	Application Notes	Knowledge Base

Features

•	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 2S or PCM compatible audio interfaces
•	Read/write I 2C compatible control interface
•	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

Key Specification

Class D Amplifier Efficiency	93% (typ)
P_EP at A_V_DD = 3.3V, 32Ω, 1% THD	58mW (typ)
P_HP at HP_V_DD = 2.8V, Stereo 32Ω, 1% THD	65mW/ch (typ)
P_LS at LS_V_DD = 5V, 8Ω, 1% THD	1.4W (typ)

P_LS at LS_V_DD = 4.2V, 8Ω, 1% THD	970mW (typ)
P_LS at LS_V_DD = 3.3V, 8Ω, 1% THD	590mW (typ)

SNR (Stereo DAC at 48kHz)	103dB (typ)
PSRR at 217 Hz, A_V_DD = 3.3V, (HP from AUX)	100dB (typ)

General Description

The LM49352 is a high performance mixed signal audio subsystem. More...

Applications

•	Smart Phones
•	Mobile Phones and VOIP Phones
•	Portable GPS Navigator and Portable Gaming Devices
•	Portable DVD/CD/AAC/MP3/MP4 Players
•	Digital Cameras/Camcorders

Parameters Values

Power@ 8Ohms, 1% THD 1.4 Watt

THD .04 %

PSRR 70 dB

SNR 103 dB

Channels 4 Channels

THD Conditions LS, 400mW, f=1kHz, mono input

PSRR Conditions LS, Vrip=200mVpp , f = 217 Hz, Mono Input

SNR Conditions Stereo DAC Input

User Supply 5 Volt

Audio Mux Yes

Capless Headphone Yes

ClassD Driver Yes

Interface I2S, PCM

Stereo Inputs 3

National 3D No

Digital Volume Control Max 18 dB

Digital Volume Control Min -76.5 dB

Supply Range +2.7 - +5.5 V

Mono Inputs 4

Temperature Min -40 deg C

Temperature Max 85 deg C

Loudspeaker Type Class D

Headphone Type True Ground

Loudspeaker Outputs 1

PowerWise Yes

A/D Channels 2 Channels

D/A Channels 2

Additional Resources

Application Notes

Connection Diagram

click for larger image

uSMD package 36 bump (photo)

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM49352 PRODUCT BRIEF Mono Class D Audio Codec Subsystem with Ground Referenced Headphone Amplifiers, Earpiece Driver, and Audio DSP	280 Kbytes	16-Apr-09	Download

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Weeks

Qty

$US each

LM49352RLEVAL

LM49352 Evaluation Board

Full production

N/A

CALL

N/A

LM49352RL

MICRO SMDXT

NOPB

260

RoHS

N/A

Full production

N/A

1K+

$7.55

reel
of
250

XYTT
I GL5

12 weeks

N/A

LM49352RLX

MICRO SMDXT

NOPB

260

RoHS

N/A

Full production

N/A

1K+

$7.55

reel
of
1000

XYTT
I GL5

12 weeks

N/A

General Description

The LM49352 is a high performance mixed signal audio subsystem. 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 loudspeaker amplifier, and an earpiece speaker amplifier. It combines 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 2S or PCM audio interfaces and an I 2C compatible interface for control. The stereo DAC path features an SNR of 103dB with 24-bit 48 kHz input. The headphone amplifier delivers 65mW_RMS (typ) to a 32Ω single-ended stereo load with less than 1% distortion (THD+N) when HP_V_DD = 2.8V. The loudspeaker amplifier delivers up to 970mW into an 8Ω load with less than 1% distortion when LS_V_DD = 4.2V.

The LM49352 employs advanced techniques to extend battery 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

More Application Notes

Title	Size in Kbytes	Date
AN-1432: Application Note 1432 The LM4935 Headset/Push-Button Detection Guide	464 Kbytes	24-Apr-06	Download
AN-1432 (Chinese): Application Note 1432 The LM4935 Headset/Push-Button Detection Guide	251 Kbytes
AN-1451: Application Note 1451 LM4935 Automatic Gain Control (AGC) Guide	550 Kbytes	24-Apr-06	Download
AN-1451 (Chinese): Application Note 1451 LM4935 Automatic Gain Control (AGC) Guide	287 Kbytes

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 7-Nov-2009]