Features E 2S class D amplifier Ground referenced outputs — eliminates output coupling capacitors I 2C programmable No Clip Function with Clip Control Voltage limiter speaker protection I 2C volume and mode Control Ear Piece Amplifier Advanced click-and-pop suppression Low supply current Micro-power shutdown 20-bump micro SMD package 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 Key Specification ■  Output power at VDD = 3.3V    THD+N ≤ 1%     LS Mode, RL = 8Ω 520mW (typ)   HP Mode, RL = 32Ω 40mW (typ) ■  Output power at VDD = 5V    THD+N ≤ 1%     LS Mode, RL = 8Ω 1.25W (typ)   HP Mode, RL = 32Ω 42mW (typ) ■  Output Offset      LS Mode 15 6mV (typ)    HP Mode 15 2mV (typ) Applications Mobile Phones PDAs Notebook PCs Portable Electronics Devices MP3 Players

Typical Application click for larger image	Connection Diagram click for larger image

Parameters Values Power @ 5V 8Ohms, 1% THD 1.25 Watt Speaker THD+N 0.02 % HP THD+N 0.015 % Speaker PSRR 91 dB HP PSRR 91 dB Speaker SNR 102 dB HP SNR 102 dB Audio Mux Yes Audio Mode Control I2C Supply Range +2.7 - +5.5 V Temperature Min -40 deg C Temperature Max 85 deg C Mono Analog Inputs 1 Stereo Analog Inputs 1 Digital Audio Ports 0 Additional Audio Features (ALC) Automatic Level Control Loudspeaker Type Class D Loudspeaker Outputs 1 Headphone Type True Ground AEC Q-100 Automotive Grade Undefined PowerWise Yes A/D Channels 0 Channels

Datasheets

Title		Size	Date	Other Language
	LM49151 Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers, Speaker Protection and No Clip with Clip Control	169 Kbytes	14-May-10

Application Notes

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

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM49151TL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 3700 MOUSER Worldwide 250	$1.60 each at 1K+ pcs	reel of 250
LM49151TLX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.60 each at 1K+ pcs	reel of 3000

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM49151.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM49151 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM49151TLEVAL	LM49151 Evaluation Board	Full production	Contact your distributor	CALL	N/A
The LM49151 is an integrated audio subsystem with a highly efficient Class D speaker amplifier with ALC, ground referenced headphone amplifier and low power earpiece bypass path in a 20-bump micro SMD package. The LM49151 is designed to meet the demands of mobile phones and other portable communication devices. It is capable of delivering 1.25W of average power into an 8 ohm load and 42 milliwatts of average power to a 32 ohm load with less than 1% distortion (THD+N) from a 5V DC power supply to VDD_LS and VDD. The ALC or Automatic Level Control has three features: No ? Clip, Clip Level Control, and Power Limit Select. The LM49151TLEVAL is an evaluation board designed to ease evaluation and effort during the development of a circuit using the LM49152TL. The evaluation board comes with an I2C card and cable. It is an easy-to-use stand-alone board that requires power and GND, an I2C control signal, an input signal and output loads. Software for the product can be downloaded from http://audio.national.com Features: Tiny micro SMD Very low iddq (7mA HP and SPKR on at 3.3V) High output power (1.25W into 8ohms at 5V) Automatic Level Control No Clip Clip Level Control Power Limit Select 95dB PSRR 217Hz for earpiece bypass (voice) path 91dB PSRR 217Hz for headphone outputs 0.015% THD+N at 600mW for speaker output 0.01% THD+N at 20mW for headphone outputs Applications: Personal Mobile Devices Mobile phones Evaluation Board Contents: Fully Assembled LM49151TL Evaluation Board I2C interface card and cable Instructions for where to locate and download the datasheet Please note: Go to http://audio.national.com for more information on using the LM49151TL evaluation kit. Resources: Eval Board Digital Control Software

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM49151TL/NOPB	6.551	MICRO SMD	20	1	260	Detail	Download	N/A	XYTT I GL7
LM49151TLX/NOPB	6.551	MICRO SMD	20	1	260	Detail	Download	N/A	XYTT I GL7

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM49151.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM49151 is located at RoHS Status.

CAD Symbols and Models Download LM49151 CAD Symbols

Models N/A

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Audio Solutions for Portable Devices Date: 2009-03-02 Length: 00:50:38