PRELIMINARY April 16, 2009 PRODUCT BRIEF Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers, Speaker Protection and No Clip with Clip Control General Description Key Specifications The LM49151 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. The LM49151 combines a 1.25W mono E2S 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 I2C programmable no-clip feature with Clip Controls and speaker protection. The E2S (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 I2C 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 ■ Output power at VDD = 3.3V THD+N ≤ 1% LS Mode, RL = 8Ω HP Mode, RL = 32Ω 520mW (typ) 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) Features ■ E2S class D amplifier ■ Ground referenced outputs — eliminates output coupling ■ ■ ■ ■ ■ ■ ■ ■ capacitors I2C programmable No Clip Function with Clip Control Voltage limiter speaker protection I2C volume and mode Control Ear Piece Amplifier Advanced click-and-pop suppression Low supply current Micro-power shutdown 20-bump micro SMD package Applications ■ ■ ■ ■ ■ Mobile Phones PDAs Notebook PCs Portable Electronics Devices MP3 Players Boomer® is a registered trademark of National Semiconductor Corporation. © 2009 National Semiconductor Corporation 300925 www.national.com LM49151 PRODUCT BRIEF LM49151 LM49151 Typical Application 30092576 FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com 2 LM49151 Connection Diagrams 20 Bump micro SMD Package Top Markings 300925t5 Top View XY - Date Code TT - Die Traceability G- Boomer L7 - LM49151TL 300925t4 Top View Order Number LM49151TL (See NS Package Number TLA20GDA) Ordering Information Order Number Package Package DWG # Transport Media MSL Level Green Status LM49151TL 20 Bump micro SMD TLA20GDA 250 units on tape and reel 1 RoHS and no sB/Br LM49151TLX 20 Bump micro SMD TLA20GDA 3000 units on tape and reel 1 RoHS and no sB/Br Bump Descriptions Bump Name A1 I2CVDD Description I2C Power Supply A2 GND A3 LSOUT- Ground Inverting Loudspeaker Output A4 LSOUT+ Non-Inverting Loudspeaker Output B1 VDD Analog Power Supply B2 SDA I2C Data Input B3 SCL I2C Clock Input B4 LSVDD Loudspeaker Power Supply C1 INL Left Channel Input C2 INR Right Channel Input C3 BYPASS C4 CPVSS D1 INM- Mono Channel Inverting Input D2 SET ALC Timing Control D3 CPN Charge Pump Flying Capacitor - Negative Terminal D4 CPP Charge Pump Flying Capacitor - Positive Terminal E1 INM+ Mono Channel Non-Inverting Input E2 HPR Right Channel Headphone Amplifier Output E3 HPL Left Channel Headphone Amplifier Output E4 CPGND Mid-Rail Supply Bypass Charge Pump Output Charge Pump Ground 3 www.national.com LM49151 PRODUCT BRIEF Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage Reference www.national.com/vref Design Made Easy www.national.com/easy PowerWise® Solutions www.national.com/powerwise Solutions www.national.com/solutions Serial Digital Interface (SDI) www.national.com/sdi Mil/Aero www.national.com/milaero Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic Wireless (PLL/VCO) www.national.com/wireless Analog University® www.national.com/AU THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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