Features 18-bit 44.1kHz or 48kHz stereo DAC 16-bit 8kHz , 12kHz , 16kHz, or 24kHz voice-band codec PLL for operation from common system clocks Either I2C or SPI compatible serial interface I2S digital audio data serial interface PCM voice audio data serial interface Differential analog microphone input 26mW/channel stereo headphone amplifier 570mW mono high efficiency BTL 8 amplifier 32-step volume control for audio output amplifiers with 1.5dB step size. Unity-gain stable headphone amplifiers No snubber networks or bootstrap capacitors are required by the headphone or hands-free amplifiers Adjustable digital side-tone attenuation 16-step volume control for microphone preamp with 2dB step size Configurable GPIO/Status Port Available in the 42 bump micro-SMD package Description The LM4931 is an integrated audio subsystem that supports voice and digital audio functions. The LM4931 includes a high quality stereo DAC, voice band codec, a stereo headphone amplifier and a high-power high efficiency mono speaker amplifier. It is primarily designed for demanding applications in mobile phones and other portable devices. The LM4931 features an I2S serial interface for full range audio, a 16-bit PCM bi-directional serial interface for the voice band codec and an I2C/SPI compatible interface for control. The full range music path features an SNR of 86dB with an 18-bit 48kHz input. The headphone amplifier delivers at least 26mWRMS to a 32 single-ended stereo load with less than 1% distortion (THD+N) when AVDD = 3.3VDC. The mono speaker amplifier delivers up to 570mWRMS into an 8 load with less than 1% distortion when AVDD = 3.3VDC. The LM4931 employs advanced techniques to reduce power consumption, to reduce controller overhead, and to eliminate click and pop. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. It is therefore ideally suited for mobile phone and other low voltage applications where minimal power consumption, PCB area, and cost are primary requirements. Key Specification PLS OUT at AVDD = 5V, 8   1% THD+N 1.1W (typ) PLS OUT at AVDD = 3.3V, 8   1% THD+N 570mW (typ) PH/P OUT at AVDD = 5V & AVDD = 3.3V, 32   1% THD+N 26mW (typ) Supply voltage range   DVDD 2.7V to 4.0V AVDD (Note 8) 2.7V to 5.0V Shutdown current 1.1µA (typ) PSRR at 217Hz, AVDD = 3V 62dB (typ) SNR (Voice Codec) 75dB (typ) SNR (Audio DAC) 86dB (typ) Applications 2.5 and 3G Mobile Phones and Multimedia Terminals PDAs, Internet Appliances and Portable Gaming Portable DVD/CD/AAC/MP3 Players Digital Cameras and Toys

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

Datasheets

Title		Size	Date	Other Language
	LM4931 Boomer ® Audio Power Amplifier Series Audio Subsystem with Mono High Efficiency Loudspeaker and Stereo Headphone Amplifiers	1951 Kbytes	25-Jul-06

More Application Notes

Title		Size	Date	Other Language
	AN-1492: Application Note 1492 LM4934 I2C/SPI Interface Software Manual v1.0	1527 Kbytes	25-May-06	中文
	AN-1432: Application Note 1432 The LM4935 Headset/Push-Button Detection Guide	464 Kbytes	24-Apr-06	中文
	AN-1451: Application Note 1451 LM4935 Automatic Gain Control (AGC) Guide	550 Kbytes	24-Apr-06	中文

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4931ITL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 12 weeks	Distributor Region Qty DIGIKEY Worldwide 609 FUTURE Worldwide 250	$3.99 each at 1K+ pcs	reel of 250

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4931ITLX	LM4931ITL	NATIONAL SEMICONDUCTOR	16 Nov 2008

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

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

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

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM4931ITL/NOPB	15.535	MICRO SMD	42	1	260	Detail	Download	N/A	XYTT I GC9

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

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

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

Design Tools

Title	Size	Date
Audio Amplifier Digital Control Interface Evaluation Board Software

CAD Symbols and Models Download LM4931 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4931ITL	CMOS7	0	18406	0	0	1089000	4	309006723

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/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

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

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4931ITLX	LM4931ITL	NATIONAL SEMICONDUCTOR	16 Nov 2008