LM49155 LM49155 PRODUCT BRIEF Uplink Noise Suppression & Downlink SNR Enhancement Analog Audio Subsystem Literature Number: SNAS492 July 21, 2010 Uplink Noise Suppression & Downlink SNR Enhancement Analog Audio Subsystem General Description Key Specifications The LM49155 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. The LM49155 combines a Noise Suppression microphone amplifier, a 1.35W mono class D amplifier with ALC, class AB earpiece driver with AGC, a high efficiency, stereo, ground referenced headphone amplifier with click pop suppression and I2C modes select and volume control. The LM49155 features analog fully differential input, and differential output microphone amplifier designed to reduce background acoustic noise, while delivering superb speech clarity in voice communication applications. Downlink SNR enhancement with an advanced acoustic AGC technology to adjust output levels. The LM49155 speaker amplifier features National’s unique output limiter that provides both a no-clip feature and speaker protection. The E2S class D amplifier features a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency. The headphone drivers feature National’s ground referenced architecture that creates a ground-referenced output from a single, low-voltage supply. The LM49155 is available in an ultra-small 36-bump micro SMD package (3.434mm x 3.459mm x 0.6mm). 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 ■ Uplink Far Field Noise Suppression Electrical FFNSE at f = 1kHz 34dB (typ) ■ Downlink SNR Enhancement Earpiece Amplifier Near-Field SNR Enhancement Downlink SNRIE 6 to 18dB (typ) 16dB (typ) ■ Class D Loudspeaker Amplifier RL = 15μH+8Ω+15μH POUT, THD+N ≤ %, VDD = 5.0V 1.35W (typ) ■ Headphone Amplifier RL = 32Ω POUT, THD+N ≤ %, HPVDD = 1.8V 19mW (typ) Features ■ Noise cancellation for uplink and downlink without DSPtype artifacts, distortions or delays ■ Adapting AGC on ambient noise level & downlink signal strength for earpiece ■ Downlink adjustable noise-reducing high pass filter ■ E2S Class D Amplifier with ALC ■ Ground Referenced Headphone Outputs with Advanced Click Pop Suppression ■ Micro-power shutdown Applications ■ Mobile Phones ■ Portable Electronic Devices Simplified Block Diagram 30108109 Boomer® is a registered trademark of National Semiconductor Corporation. © 2010 National Semiconductor Corporation 301081 www.national.com LM49155 Product Brief PRELIMINARY LM49155 PRODUCT BRIEF LM49155 Typical Application 30108108 FIGURE 1. Typical Application Circuit www.national.com 2 LM49155 Connection Diagrams TL Package (3.434mm x 3.459mm x 0.6mm) 36 Bump micro SMD Marking 30108112 Top View XX — Date Code YY — Die Traceability G — Boomer N7 — LM49155TL 30108107 Top View (Bump Side Down) Order Number LM49155TL See NS Package Number TLA36STA Ordering Information Order Number Package Package DWG # Transport Media MSL Level Green Status LM49155TL 36 Bump microSMD LM49155TLX 36 Bump microSMD TLA36STA 250 units on tape and reel 1 NOPB TLA36STA 3000 units on tape and reel 1 NOPB 3 www.national.com LM49155 Physical Dimensions inches (millimeters) unless otherwise noted micro SMD–36 Package Order Number LM49155TL NS Package Number TLA36STA www.national.com 4 LM49155 Notes 5 www.national.com LM49155 Product Brief Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com 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 References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise® Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise® Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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