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LM4985 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4985 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 29 page  LM4985 Stereo 135mW Low Noise Headphone Amplifier with Selectable Capacitively Coupled or Output Capacitor-less (OCL) Output and Digitally Controlled (I 2C) Volume Control General Description The LM4985 is a stereo audio power amplifier with internal digitally controlled volume control. This amplifier is capable of delivering 68mW RMS per channel into a 16 Ω load or 38mW RMS per channel into a 32 Ω load at 1% THD when powered by a 3.6V power supply and operating in the OCL mode. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. To that end, the LM4985 features two functions that optimize system cost and minimize PCB area: an integrated, digitally controlled (I 2C bus) volume control and an operational mode that eliminates output signal cou- pling capacitors (OCL mode). Since the LM4985 does not require bootstrap capacitors, snubber networks, or output coupling capacitors, it is optimally suited for low-power, bat- tery powered portable systems. For added design flexibility, the LM4985 can also be configured for single-ended capaci- tively coupled outputs. The LM4985 features a current shutdown mode for mi- cropower dissipation and thermal shutdown protection. Key Specifications (V DD = 3.6V) j PSRR: 217Hz and 1kHz Output Capacitor-less (OCL) f RIPPLE = 217Hz 77dB (typ) f RIPPLE = 1kHz 76dB (typ) Capacitor Coupled (C-CUPL) f RIPPLE = 217Hz 63dB (typ) f RIPPLE = 1kHz 62dB (typ) j Output Power per channel (f IN = 1kHz, THD+N = 1%), R L =16 Ω,OCL V DD = 2.5V 31mW (typ) V DD = 3.6V 68mW (typ) V DD = 5.0V 135mW (typ) j THD+N (f = 1kHz) R LOAD =16 Ω, OCL, P OUT = 60mW 0.60 R LOAD =32 Ω, OCL, P OUT = 33mW 0.031 j Shutdown Current 0.1µA (typ) Features n OCL or capacitively coupled outputs (patent pending) n I 2C Digitally Controlled Volume Control n Available in space-saving 0.4mm lead-pitch micro SMD package n Volume control range: –76dB to +18dB n Ultra low current shutdown mode n 2.3V - 5.5V operation n Ultra low noise Applications n Mobile Phones n PDAs n Portable electronics devices n MP3 Players Boomer® is a registered trademark of National Semiconductor Corporation. May 2006 © 2006 National Semiconductor Corporation DS201697 www.national.com |
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