Features Differential mono input and stereo single-ended input Separate earpiece (receiver) differential input Analog switch for a separate earpiece path 32-step digital volume control (-80 to +18dB) Three independent volume channels (Left, Right, Mono) Separate headphone volume control Flexible output for speaker and headphone output True Ground headphone amplifier eliminates large DC blocking capacitors reducing PCB space and cost. Hardware reset function RF immunity topology “Click and Pop” suppression circuitry Thermal shutdown protection Micro-power shutdown I 2C control interface Available in space-saving microSMD package Description The LM49101 is a fully integrated audio subsystem with a mono power amplifier capable of delivering 540mW of continuous average power into an 8Ω BTL speaker load with 1% THD+N using a 3.3V supply. The LM49101 includes a separate stereo headphone amplifier that can deliver 44mW per channel into 32Ω loads using a 2.75V supply. The LM49101 has four input channels. A pair of single-ended inputs and a fully differential input channel with volume control and amplification stages. Additionally, a bypass differential input is available that connects directly to the mono speaker outputs through an analog switch without any amplification or volume control stages. The LM49101 features a 32–step digital volume control on the input stage and an 8–step digital volume control on the headphone output stage. The digital volume control and output modes, programmed through a two-wire I 2C compatible interface, allows flexibility in routing and mixing audio channels. The LM49101 is designed for cellular phones, PDAs, and other portable handheld applications. The high level of integration minimizes external components. The True Ground headphone amplifier eliminates the physically large DC blocking output capacitors reducing required board space and reducing cost. Key Specification ■  Supply Voltage (VDDLS) 2.7V ≤ VDDLS ≤ 5.5V ■  Supply Voltage (VDDHP) 1.8V ≤ VDDHP ≤ 2.9V ■  I 2C Supply Voltage 1.7V ≤ I 2CVDD ≤ 5.5V ■  Output power      VDDLS = 5V, VDDHP = 2.75V     1% THD+N     RL = 8Ω speaker 1.3W (typ)   RL = 32Ω headphone 45mW (typ) ■  Output Power      VDDLS = 3.3V, VDDHP = 2.75V    1% THD+N     RL = 8Ω speaker 540W (typ)   RL = 32Ω headphone 40mW (typ) ■  PSRR:    VDD = 3.3V, 217Hz ripple, Mono In 90dB (typ) ■  Shutdown power supply current 0.01μA (typ) Applications Portable electronic devices Mobile Phones PDAs

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

Parameters Values Power @ 5V 8Ohms, 1% THD 1.3 Watt Speaker THD+N 0.065 % HP THD+N 0.015 % Speaker PSRR 90 dB HP PSRR 85 dB Speaker SNR 108 dB HP SNR 100 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 2 Stereo Analog Inputs 1 Digital Audio Ports 0 Loudspeaker Type Class AB Loudspeaker Outputs 1 Headphone Type True Ground Automotive No PowerWise Yes A/D Channels Undefined Channels

Datasheets

Title		Size	Date	Other Language
	LM49101 Mono Class AB Audio Subsystem with a True Ground Headphone Amplifier and Earpiece Switch	822 Kbytes	23-Mar-09

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM49101TM/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 730 MOUSER Worldwide 500	$1.45 each at 1K+ pcs	reel of 250
LM49101TMX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.45 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 LM49101.

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 LM49101 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM49101TMEVAL	LM49101 Evaluation Board	Full production	Distributor Region Qty	CALL	N/A
Description: The LM49101 is an integrated mono subsystem with mono Class AB speaker amplifier with ground referenced headphone amplifiers and earpiece switch. A differential mono input and single ended stereo inputs allow maximum flexibility in this mono analog audio subsystem. The tiny micro SMD package has only 25 bumps. The LM49101 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 45 milliwatts of average power to a 32 ohm headphone load with less than 1% distortion (THD+N) from a 5V DC power supply. The LM49101TMEVAL is an evaluation board designed to ease evaluation and effort during the development of a circuit using the LM49101TM. The evaluation board comes with an USB 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 and robust micro SMD Very low iddq (2.0mA for LS output mode 1 @ 3.3V) High output power (1.30W into 8ohms at 5V) 85dB PSRR 217Hz for headphone outputs 90dB PSRR 217Hz for loudspeaker outputs 100dB SNR 1kHz for headphone outputs 108dB SNR 1kHz for loudspeaker outputs 0.015% THD+N at 20mW for headphone outputs 0.055% THD+N at 600mW for speaker output Applications: Mobile phones Portable Navigation Devices Portable Media Players Contents: Fully Assembled LM49101TM Evaluation Board USB interface card and cable Instructions for where to locate and download the datasheet Please note: Go to http://www.audio.national.com for more information on using the LM49101TM 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
LM49101TM/NOPB	5.651	MICRO SMD	25	1	260	Detail	Download	N/A	XYTT I GL4
LM49101TMX/NOPB	5.651	MICRO SMD	25	1	260	Detail	Download	N/A	XYTT I GL4

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 LM49101.

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 LM49101 is located at RoHS Status.

CAD Symbols and Models Download LM49101 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM49101TM	CMOS7	0	21301	0	0	1584000	3	449464325
LM49101TMX	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 LM49101.

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 LM49101 is located at RoHS Status.

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