Features RF immunity Selectable OCL/SE headphone drivers 32 Step volume control Click and Pop suppression Independent speaker and headphone gain settings Minimum external components Thermal over load protection Micro-power shutdown Space saving 16–bump mciro SMD package Thermal shutdown protection Micro-power shutdown I 2C Control Interface Description The LM49120 is a compact audio subsystem designed for portable handheld applications such as cellular phones. The LM49120 combines a mono 1.3W speaker amplifier, stereo 85mW/ch output capacitorless headphone amplifier, 32 step volume control, and an input mixer/multiplexer into a single 16–bump micro SMD package. The LM49120 has three input channels: two single-ended stereo inputs and a differential mono input. Each input features a 32-step digital volume control. The headphone output stage features an 8 step (-18dB – 0dB) attenuator, while the speaker output stage has two selectable (0dB/+6dB) gain settings. The digital volume control and mode control are programmed through a two-wire I 2C compatible interface. Key Specification ■  Output power at VDD = 5V:    Speaker:    RL = 8Ω BTL, THD+N ≤ 1% 1.3W (typ)  Headphone:    RL = 32Ω, SE, THD+N ≤ 1% 85mW (typ) ■  Output power at VDD = 3.6V:    Speaker:    RL = 8Ω, BTL, THD+N ≤ 1% 632mW (typ) ■  Output power at VDD = 3.3V:    Speaker:    RL = 8Ω, BTL, THD+N ≤ 1% 540mW (typ)  Headphone:    RL = 32Ω, OCL/SE, THD+N ≤ 1% 35mW (typ) Applications Mobile Phones PDAs Portable Electronics

Also Recommended LM49151▲ Class D With ALC, Ground Reference Headphone

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

Parameters / Values	LM49120	LM49151
Power @ 5V 8Ohms, 1% THD	1.3 Watt	1.25 Watt
Speaker THD+N	0.05 %	0.02 %
HP THD+N	0.015 %	0.015 %
Speaker PSRR	83 dB	91 dB
HP PSRR	84 dB	91 dB
Audio Mux	Yes	Yes
Audio Mode Control	I2C	I2C
Supply Range	+2.7 - +5.5 V	+2.7 - +5.5 V
Temperature Min	-40 deg C	-40 deg C
Temperature Max	85 deg C	85 deg C
Mono Analog Inputs	1	1
Stereo Analog Inputs	1	1
Digital Audio Ports	0	0
Loudspeaker Type	Class AB	Class D
Loudspeaker Outputs	1	1
Headphone Type	Virtual Ground	True Ground
Automotive	No
PowerWise	Undefined	Yes
A/D Channels	Undefined Channels	0 Channels

Datasheets

Title		Size	Date	Other Language
	LM49120 Audio Sub-System with Mono Class AB Loudspeaker Amplifier and Stereo OCL/SE Headphone Amplifier	730 Kbytes	16-Jul-08

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM49120TL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 1030 MOUSER Worldwide 475	$1.25 each at 1K+ pcs	reel of 250
LM49120TLX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.25 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 LM49120.

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 LM49120 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM49120TLEVAL	LM49120 Evaluation Board	Full production	Distributor Region Qty	CALL	N/A
Description: The LM49120 is an integrated mono subsystem with Class AB speaker or earpiece amplifier and output capacitorless headphone amplifier in a 16-bump micro SMD package. The LM49120 is designed to meet the demands of mobile phones and other portable communication devices. It is capable of delivering 1.3W of average power into an 8 ohm load and 85 milliwatts of average power to a 32 ohm load with less than 1% distortion (THD+N) from a 5V DC power supply. The LM49120TLEVAL is an evaluation board designed to ease evaluation and effort during the development of a circuit using the LM49120TL. 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 an output load. Software for the product can be downloaded from http://audio.national.com Features: Tiny micro SMD package Optimized function set for portable devices High output power (1.3W into 8ohms at 5V) 0.05% THD+N at 250mW for speaker output 0.015% THD+N at 12mW for headphone outputs Applications: Mobile phones Portable Navigation Devices PMPs Portable device Contents: Fully Assembled LM49120TL 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 LM49120TL evaluation kit.

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
LM49120TL/NOPB	4.813	MICRO SMD	16	1	260	Detail	Download	N/A	XYTT I GK2
LM49120TLX/NOPB	4.813	MICRO SMD	16	1	260	Detail	Download	N/A	XYTT I GK2

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 LM49120.

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 LM49120 is located at RoHS Status.

CAD Symbols and Models Download LM49120 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM49120TL	CMOS7	0	21301	0	0	1584000	3	449464325
LM49120TLX	CMOS7	0	21301	0	0	1584000	3	449464325

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

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 LM49120.

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 LM49120 is located at RoHS Status.