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LM4985TMEVAL Datasheet(PDF) 1 Page - Texas Instruments |
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LM4985TMEVAL Datasheet(HTML) 1 Page - Texas Instruments |
1 / 33 page LM4985, LM4985TMEVAL www.ti.com SNAS346B – MAY 2006 – REVISED MAY 2006 LM4985 Boomer™ Audio Power Amplifier Series Stereo 135mW Low Noise Headphone Amplifier with Selectable Capacitively Coupled or Output Capacitor-less (OCL) Output and Digitally Controlled (I2C) Volume Control Check for Samples: LM4985, LM4985TMEVAL 1 FEATURES DESCRIPTION The LM4985 is a stereo audio power amplifier with 23 • OCL or Capacitively Coupled Outputs (Patent internal digitally controlled volume control. This Pending) amplifier is capable of delivering 68mWRMS per • I2C Digitally Controlled Volume Control channel into a 16 Ω load or 38mWRMS per channel • Available in Space-Saving 0.4mm Lead-Pitch into a 32 Ω load at 1% THD when powered by a 3.6V power supply and operating in the OCL mode. DSBGA Package • Volume Control Range: –76dB to +18dB Boomer audio power amplifiers were designed specifically to provide high quality output power with a • Ultra Low Current Shutdown Mode minimal amount of external components. To that end, • 2.3V - 5.5V Operation the LM4985 features two functions that optimize • Ultra Low Noise system cost and minimize PCB area: an integrated, digitally controlled (I2C bus) volume control and an APPLICATIONS operational mode that eliminates output signal coupling capacitors (OCL mode). Since the LM4985 • Mobile Phones does not require bootstrap capacitors, snubber • PDAs networks, or output coupling capacitors, it is optimally suited for low-power, battery powered portable • Portable Electronics Devices systems. For added design flexibility, the LM4985 can • MP3 Players also be configured for single-ended capacitively coupled outputs. KEY SPECIFICATIONS (VDD = 3.6V) The LM4985 features a current shutdown mode for • PSRR: 217Hz and 1kHzs micropower dissipation and thermal shutdown – Output Capacitor-Less (OCL) protection. – fRIPPLE = 217Hz, 77dB (Typ) – fRIPPLE = 1kHz, 76dB (Typ) – Capacitor Coupled (C-CUPL) – fRIPPLE = 217Hz, 63dB (Typ) – fRIPPLE = 1kHz, 62dB (Typ) • Output Power Per Channel (fIN = 1kHz, THD+N = 1%), RL = 16Ω, OCL – VDD = 2.5V, 31mW (Typ) – VDD = 3.6V, 68mW (Typ) – VDD = 5.0V, 135mW (Typ) • THD+N (f = 1kHz) – RLOAD = 16Ω, OCL, POUT = 60mW, 0.60 – RLOAD = 32Ω, OCL, POUT = 33mW, 0.031 • Shutdown Current, 0.1µA (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. 2 Boomer is a trademark of Texas Instruments. 3 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2006, 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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