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LM49155 Dataheets PDF



Part Number LM49155
Manufacturers Texas Instruments
Logo Texas Instruments
Description Uplink Noise Suppression & Downlink SNR Enhancement Analog Audio Subsystem
Datasheet LM49155 DatasheetLM49155 Datasheet (PDF)

LM49155 www.ti.com SNAS492 – JULY 2010 PRODUCT BRIEF LM49155 Uplink Noise Suppression & Downlink SNR Enhancement Analog Audio Subsystem Check for Samples: LM49155 FEATURES 1 •2 Noise cancellation for uplink and downlink without DSP-type 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 P.

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LM49155 www.ti.com SNAS492 – JULY 2010 PRODUCT BRIEF LM49155 Uplink Noise Suppression & Downlink SNR Enhancement Analog Audio Subsystem Check for Samples: LM49155 FEATURES 1 •2 Noise cancellation for uplink and downlink without DSP-type 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 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 Uplink Far Field Noise Suppression Electrical FFNSE at f = 1kHz Downlink SNR Enhancement Earpiece Amplifier Class D Loudspeaker Amplifier RL = 15μH+8Ω+15μH POUT, THD+N ≤ %, VDD = 5.0V Headphone Amplifier RL = 32Ω POUT, THD+N ≤ %, HPVDD = 1.8V Near-Field SNR Enhancement Downlink SNRIE VALUE 34 6 to 18 16 1.35 19 UNIT dB (typ) dB (typ) W (typ) mW (typ) 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. All trademarks are the property of their respective owners. 2 PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2010, Texas Instruments Incorporated LM49155 SNAS492 – JULY 2010 Simplified Block Diagram COMMUNICATIONS PROCESSOR UPLINK NOISE SUPPRESSION SNR ENHANCER MONO VOLUME STEREO VOLUME MIXER AGC EARPIECE AMPLIFIER ALC www.ti.com 2 Submit Documentation Feedback Product Folder Links: LM49155 Copyright © 2010, Texas Instruments Incorporated www.ti.com Typical Application MIC_BIAS VOLTAGE Ci1 470 nF MIC1+ MIC1Ci2 470 nF Ci3 470 nF MIC2+ MIC2Ci4 470 nF MIC_GND Audio Differential Input Audio Single-Ended Inputs Ci5 68 nF INM+ INM Ci6 68 nF INL Ci7 0.22 µF INR Ci8 0.22 µF BYPASS CB 2.2 µF I2CVDD SDA SCL LM49155 SNAS492 – JULY 2010 2.7V to 5.5V CS1 1 µF VDD 2.7V to 5.5V CS2 1 µF LSVDD PRE-AMP 12 dB to 36 dB ANALOG UPLINK/ DOWNLINK NOISE CANCELLING PROCESSOR and SNR ENHANCER POST-AMP 6 dB/12 dB 4.7 µF CT1 CT2 4.7 µF CT3 4.7 µF DCAP 4.7 µF LPF+ CLP1 MICOUT+ MICOUT- To Uplink Signal Path CLP2 LPF- AGC AMP OUTPUT POWER LIMITER EPOUT+ EPOUT- VOLUME -80 dB to +18 dB -6 dB VOLUME -80 dB to +18 dB Mixer and Output Mode VOLUME -80 dB to +18 dB BIAS I2C INTERFACE AUTOMATIC LEVEL CONTROL Class D +12 dB, +18 dB -18 dB to 0 dB -18 dB to 0 dB CHARGE PUMP LSOUT+ LSOUT- SET CSET RSET 0.1 µF (Optional) HPL HPR 1.7V to 2.7V HPVDD CS3 1 µF MIC_GND GND CPVSS 2.2 µF CIN CIP CPGND C1 2.2 µF Figure 1. Typical Application Circuit Copyright © 2010, Texas Instruments Incorporated Product Folder Links: LM49155 Submit Documentation Feedback 3 LM49155 SNAS492 – JULY 2010 Connection Diagrams spacer spacer TL Package (3.434mm x 3.459mm x 0.6mm) Top View 6 5 4 3 2 1 A B C D E F Figure 2. Top View (Bump Side Down) 36 Bump micro SMD Marking XXYY GN7 Bump A1 Figure 3. Top View XX .


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