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LM49155 데이터시트(PDF) 1 Page - Texas Instruments |
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LM49155 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 10 page LM49155 www.ti.com SNAS492 – JULY 2010 LM49155 PRODUCT BRIEF Uplink Noise Suppression & Downlink SNR Enhancement Analog Audio Subsystem Check for Samples: LM49155 1 FEATURES • E2S Class D Amplifier with ALC • Ground Referenced Headphone Outputs with 2 • Noise cancellation for uplink and downlink Advanced Click Pop Suppression without DSP-type artifacts, distortions or delays • Micro-power shutdown • Adapting AGC on ambient noise level & APPLICATIONS downlink signal strength for earpiece • Downlink adjustable noise-reducing high pass • Mobile Phones filter • Portable Electronic Devices DESCRIPTION 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 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Table 1. Key Specifications VALUE UNIT Uplink Far Field Noise Suppression 34 dB (typ) Electrical FFNSE at f = 1kHz Near-Field SNR Enhancement 6 to 18 Downlink SNR Enhancement Earpiece Amplifier dB (typ) Downlink SNRIE 16 Class D Loudspeaker Amplifier RL = 15μH+8Ω+15μH 1.35 W (typ) POUT, THD+N ≤ %, VDD = 5.0V Headphone Amplifier RL = 32Ω 19 mW (typ) POUT, THD+N ≤ %, HPVDD = 1.8V 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2010, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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