Features Ultra efficient, spread spectrum Class D loudspeaker amplifier that operates at 93% efficiency Low voltage, true ground headphone amplifier operation High performance 103dB SNR stereo DAC High performance 97dB SNR stereo ADC Up to 96kHz stereo audio playback Up to 48kHz stereo recording Dual bidirectional I 2S or PCM compatible audio interfaces Read/write I 2C compatible control interface Flexible digital mixer with sample rate conversion Sigma-delta PLL clock network that supports system clocks up to 50MHz including 13MHz, 19.2MHz, and 26MHz Dual stereo 5 band parametric equalizers Cascadable DSP effects that allow stereo 10 band parametric equalization ALC/Limiter/Compressor on both DAC and ADC paths Dedicated Earpiece Speaker Amplifier Stereo auxiliary inputs and mono differential input Differential microphone input with single-ended option Automatic level control for digital audio inputs, mono differential input, microphone input, and stereo auxiliary inputs Flexible audio routing from input to output 16 Step volume control for microphone with 2dB steps 32 Step volume control for auxiliary inputs in 1.5dB steps 4 Step volume control for class D loudspeaker amplifier 8 Step volume control for headphone amplifier Micro-power shutdown mode Available in the 3.3 x 3.3 mm 36 bump micro SMD package Description The LM49352 is a high performance mixed signal audio subsystem. The LM49352 includes a high quality stereo DAC, a high quality stereo ADC, a stereo headphone amplifier, which supports True Ground operation, a low EMI Class D loudspeaker amplifier, and an earpiece speaker amplifier. It combines advanced audio processing, conversion, mixing, and amplification in the smallest possible footprint while extending the battery life of feature rich portable devices. The LM49352 features dual bi-directional I 2S or PCM audio interfaces and an I 2C compatible interface for control. The stereo DAC path features an SNR of 103dB with 24-bit 48 kHz input. The headphone amplifier delivers 65mWRMS (typ) to a 32Ω single-ended stereo load with less than 1% distortion (THD+N) when HP_VDD = 2.8V. The loudspeaker amplifier delivers up to 970mW into an 8Ω load with less than 1% distortion when LS_VDD = 4.2V. The LM49352 employs advanced techniques to extend battery life, to reduce controller overhead, to speed development time, and to eliminate click and pop artifacts. Boomer audio power amplifiers are designed specifically for mobile devices and require minimal PCB area and external components. Key Specification Class D Amplifier Efficiency 93% (typ) PEP at A_VDD = 3.3V, 32Ω, 1% THD 58mW (typ) PHP at HP_VDD = 2.8V, Stereo 32Ω, 1% THD 65mW/ch (typ) PLS at LS_VDD = 5V, 8Ω, 1% THD 1.4W (typ) PLS at LS_VDD = 4.2V, 8Ω, 1% THD 970mW (typ) PLS at LS_VDD = 3.3V, 8Ω, 1% THD 590mW (typ) SNR (Stereo DAC at 48kHz) 103dB (typ) PSRR at 217 Hz, A_VDD = 3.3V, (HP from AUX) 100dB (typ) Applications Smart Phones Mobile Phones and VOIP Phones Portable GPS Navigator and Portable Gaming Devices Portable DVD/CD/AAC/MP3/MP4 Players Digital Cameras/Camcorders

Typical Application click for larger image	Connection Diagram click for larger image uSMD package 36 bump (photo)
Typical Performance click for larger image

Parameters Values Power @ 5V 8Ohms, 1% THD 1.4 Watt Speaker THD+N 0.03 % HP THD+N 0.025 % Speaker PSRR 70 dB HP PSRR 88 dB Speaker SNR 103 dB HP SNR 98 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 3 Stereo Analog Inputs 3 Digital Audio Ports 2 Additional Audio Features Audio DSP Loudspeaker Type Class D Loudspeaker Outputs 1 Headphone Type True Ground AEC Q-100 Automotive Grade Undefined PowerWise Yes A/D Channels 2 Channels

Datasheets

Title		Size	Date	Other Language
	LM49352 Mono Class D Audio Codec Subsytem with Ground Referenced Headphone Amplifiers, Earpiece Driver, and Audio DSP	3038 Kbytes	1-Jul-10

Other Technical Documents

Title		Type	Date
	Mixed-Signal Audio Subsystem Enables High-Performance Audio in Portable Electronics	External Article	2009-05-15

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM49352RL/NOPB RoHS Status	MICRO SMDXT	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 600 MOUSER Worldwide 250	$1.29 each at 1K+ pcs	reel of 250
LM49352RLX/NOPB RoHS Status	MICRO SMDXT	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.29 each at 1K+ pcs	reel of 1000

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 LM49352.

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 LM49352 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM49352RLEVAL	LM49352 Evaluation Board	Full production	Distributor Region Qty MOUSER Worldwide 2	$999.00 each	1
General Description: The LM49352 is a high performance audio codec subsystem featuring 24-bit stereo DAC and ADC, filterless stereo Class D speaker amplifier, earpiece driver or auxiliary (line out) output and ground referenced, low noise headphone amplifiers. 2 digital ports support either I2S or PCM and multiple analog inputs provide additional flexibility. This easy to use, fully featured audio codec subsystem is available in National's robust micro SMDxt package. The LM49352 also features RF suppression circuitry and National's digital 3D enhancement. The LM49352 is designed to meet the demands of portable consumer devices. It is capable of delivering 590mW of average power into an 8 ohm load and 65 milliwatts of average power to a 32 ohm load with less than 1% distortion (THD+N) when LSVDD is supplied with 3.3V DC. LSVDD can be supplied directly by the battery (the device supports up to 5.5V operating voltage) for higher output power. The LM49352RLEVAL is an evaluation board designed to ease evaluation and effort during the development of a circuit using the LM49352RL. The evaluation board comes with a USB motherboard and cable. Software is easy to develop with the purpose-built GUI supplied with the board. The LM49352RLEVAL 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: 36-bump micro SMDxt package 96kHz stereo audio playback 48kHz stereo recording Dual 5 band parametric EQ National 3D enhancement 103dB SNR (Stereo DAC @ 48kHz) 93% Loudspeaker Class D Efficiency Applications: Smart phones Portable Navigation Devices Portable DVD players Portable media players Portable Gaming Devices PDAs Laptops Evaluation Board Contents: Fully Assembled LM49352RL Evaluation Board USB motherboard and cable Please note: Go to http://audio.national.com for more information on using the LM49352RL 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
LM49352RL/NOPB	12.192	MICRO SMDXT	36	1	260	Detail	Download	N/A	XYTT I GL5
LM49352RLX/NOPB	12.192	MICRO SMDXT	36	1	260	Detail	Download	N/A	XYTT I GL5

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 LM49352.

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 LM49352 is located at RoHS Status.

CAD Symbols and Models Download LM49352 CAD Symbols

Models N/A

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