RoHS Compliance Information	Size in Kbytes	Date
LM49151   PRODUCT BRIEF Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers, Speaker Protection and No Clip with Clip Control	167 Kbytes	16-Apr-09	Download

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

Qty

$US each

LM49151TLEVAL

LM49151 Evaluation Board

Full production

N/A

CALL

N/A

-

N/A

N/A

LM49151TL

MICRO SMD

20

NOPB

1

260

RoHS

N/A

Full production

N/A

1K+

$1.60

reel of 250

XYTT I GL7

12 weeks

N/A

LM49151TLX

MICRO SMD

20

NOPB

1

260

RoHS

N/A

Full production

N/A

1K+

$1.60

reel of 3000

XYTT I GL7

12 weeks

N/A

General Description

The LM49151 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. The LM49151 combines a 1.25W mono E 2S class D amplifier, 125mW Class AB earpiece driver, 42mW/channel stereo ground referenced headphone drivers, volume control, input mixer/multiplexer, and speaker protection into a single device.

The LM49151 class D speaker amplifier features National’s unique Automatic Level Control (ALC) that provides both a I 2C programmable no-clip feature with Clip Controls and speaker protection. The E 2S (Enhanced Emission Suppression) class D amplifier features a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency while delivering 1.25W into an 8Ω load with <1% THD+N with a 5V supply. The 42mW/channel headphone drivers feature National’s ground referenced architecture that creates a ground-referenced output from a single supply, eliminating the need for bulky and expensive DC-blocking capacitors, saving space and minimizing system cost.

The LM49151 features separate volume controls for the loudspeaker and headphone inputs. Mode selection, shutdown control, and volume are controlled through an I 2C compatible interface. The LM49151's superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

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

Application Notes

Title	Size in Kbytes	Date
AN-1964: Application Note 1964 LM49151 Demonstration Board and Software Guide	1605 Kbytes	13-May-09	Download