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LM49270 Dataheets PDF



Part Number LM49270
Manufacturers Texas Instruments
Logo Texas Instruments
Description Filterless 2.2W Stereo Class D Audio Subsystem
Datasheet LM49270 DatasheetLM49270 Datasheet (PDF)

LM49270 www.ti.com SNAS384B – DECEMBER 2006 – REVISED MARCH 2007 LM49270 Filterless 2.2W Stereo Class D Audio Subsystem with OCL Headphone Amplifier, 3D Enhancement, and Headphone Sense Check for Samples: LM49270 FEATURES 1 •2 Stereo Filterless Class D Amplifier • Selectable OCL/CC Headphone Amplifier • Headphone Sense Ability • TI’s 3D Enhancement • RF Suppression • I2C Control Interface • 32-Step Digital Volume Control • 6 Operating Modes • Output Short Circuit Protection and Thermal Sh.

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LM49270 www.ti.com SNAS384B – DECEMBER 2006 – REVISED MARCH 2007 LM49270 Filterless 2.2W Stereo Class D Audio Subsystem with OCL Headphone Amplifier, 3D Enhancement, and Headphone Sense Check for Samples: LM49270 FEATURES 1 •2 Stereo Filterless Class D Amplifier • Selectable OCL/CC Headphone Amplifier • Headphone Sense Ability • TI’s 3D Enhancement • RF Suppression • I2C Control Interface • 32-Step Digital Volume Control • 6 Operating Modes • Output Short Circuit Protection and Thermal Shutdown Protection • Minimum External Components • Click and Pop Suppression • Micro-Power Shutdown • Independent Speaker and Headphone Volume Controls • Available in Space-Saving 28 Pin WQFN Package APPLICATIONS • Portable DVD Players • Smart Phones • PDAs • Laptops KEY SPECIFICATIONS • Stereo Class D Amplifier Efficiency: – VDD = 3.3V, 450mW/Ch into 8Ω 84% – VDD = 5V, 1W/Ch into 8Ω 84% • Quiescent Power Supply Current, VDD = 3.3V – Speaker Mode 5.5 mA – Headphone Mode (OCL) 4 mA • Power Output/Channel, VDD = 5V – Class D Speaker Amplifier: – RL = 4Ω, THD+N = ≤ 10% 2.3 W – RL = 8Ω, THD+N = ≤ 1% 106 W – Headphone Amplifier: – RL = 16Ω, THD+N = ≤ 1% 155 mW – RL = 32Ω, THD+N = ≤ 1% 90 mW • Shutdown Current 0.02μA DESCRIPTION The LM49270 is a fully integrated audio subsystem designed for stereo multimedia applications. The LM49270 combines a 2.2W stereo Class D amplifier with a 155mW stereo headphone amplifier, volume control, headphone sense, and TI’s unique 3D sound enhancement into a single device. The LM49270 uses flexible I2C control interface for multiple application requirements. The filterless stereo class D amplifiers delivers 2.2W/channel into a 4Ω load with less than 10% THD+N with a 5V supply. The headphone amplifier features Output Capacitor-less (OCL) architecture that eliminates the output coupling capacitors required by traditional headphone amplifiers. The IC features a headphone sense input (HPS) that automatically detects the presence of a headphone and configures the device accordingly. The LM49270 can automatically switch from OCL headphone output to a line driver output. If the VOC pin is pulled to GND, the VOC amplifier is disabled and the VOC pin is internally set to GND. This feature allows the LM49270 to be used as a line driver in OCL mode without a GND conflict on the headphone jack sleeve. Additionally, the headphone amplifier can be configured as capacitively coupled (CC). The LM49270 features a 32 step volume control for the headphone and stereo outputs. The device mode select and volume are controlled through an I2C compatible interface. Output short circuit and thermal shutdown protection prevent the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49270 is available in a space saving 28-pin, 5x5mm WQFN package. 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 © 2006–2007, Texas Instruments Incorporated LM49270 SNAS384B – DECEMBER 2006 – REVISED MARCH 2007 www.ti.com 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. Typical Application VDD CS CS VDD LSVDD LSVDD Audio Input CIN LIN L3DIN R3D R3DADJ C3D Audio Input R3DIN CIN RIN 3D CONTROL SPEAKER VOLUME CONTROL LLS+ LLSLSGND RLS+ RLS- HPS BYPASS CB I2CVDD Bias Click/Pop Suppresion I2CVDD SDA I2C BUS SCL I2C Interface ADR HEADPHONE VOLUME CONTROL GND LHP RHP VOC HPVDD HPVDD VIH CS VIL Figure 1. Typical Audio Amplifier Application Circuit 2 Submit Documentation Feedback Product Folder Links: LM49270 Copyright © 2006–2007, Texas Instruments Incorporated www.ti.com Connection Diagram LM49270 SNAS384B – DECEMBER 2006 – REVISED MARCH 2007 GND HPS SCL SDA LSVDD LLS+ LLS28 27 26 25 24 23 22 RHP 1 21 NC VOC 2 20 ADR LHP 3 HPVDD 4 19 VDD 18 LSGND R3DIN 5 L3DIN 6 BYPASS 7 17 I2CVDD 16 NC 15 NC 8 9 10 11 12 13 14 LIN RIN GND NC LSVDD RLS+ RLS- Figure 2. WQFN Package 5mm x 5mm x 0.8mm Top View See Package Number RSG0028A Pin Descriptions PIN NAME 1 RHP 2 VOC 3 LHP 4 HPVDD 5 R3DIN 6 L3DIN 7 BYPASS 8 LIN 9 RIN 10 GND 11 NC 12 LSVDD 13 RLS+ 14 RLS- 15 NC 16 NC 17 I2CVDD 18 LSGND 19 VDD 20 ADR 21 NC 22 LLS- .


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