LM48861 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – Ground-Referenced, Ultra Low Noise, Stereo Headphone Amplifier

LM48861, LM48861TMBD
www.ti.com
SNAS450B – JUNE 2008 – REVISED MAY 2013
LM48861
Ground-Referenced, Ultra Low Noise, Stereo
Headphone Amplifier
Check for Samples: LM48861, LM48861TMBD
FEATURES
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•23 Ground Referenced Outputs – Eliminates
Output Coupling Capacitors
• Common-Mode Sensing
• Advanced Click-and-Pop Suppression
• Low Supply Current
• Minimum External Components
• Micro-Power Shutdown
• ESD Protection of 8kV HBM Contact
• Available in Space-Saving 12-Bump DSBGA
Package
APPLICATIONS
• Mobile Phones
• Portable Electronic Devices
• MP3 Players
KEY SPECIFICATIONS
• Output Power/Channel at
V_DD = 1.5V,THD+N = 1%
– R_L = 16Ω 12mW (typ)
– R_L = 32Ω 13mW (typ)
• Output Power/Channel at
V_DD = 1.8V, THD+N = 1%
– R_L = 16Ω 24mW (typ)
– R_L = 32Ω 22mW (typ)
• Quiescent Power Supply Current at 1.5V
2mA (typ)
• PSRR at 217Hz 83dB (typ)
• Shutdown Current 0.01μA (typ)
DESCRIPTION
The LM48861 is a single supply, ground-referenced
stereo headphone amplifier. Part of TI's PowerWise™
product family, the LM48861 consumes only 3mW of
power, yet still provides great audio performance. The
ground-referenced architecture eliminates the larger
DC blocking capacitors required by traditional
headphone amplifier's saving board space and
reducing cost.
The LM48861 features common-mode sensing that
corrects for any differences between the amplifier
ground and the potential at the headphone return
terminal, minimizing noise created by any ground
mismatches.
The LM48861 delivers 22mW/channel into a 32Ω
load with <1% THD+N with a 1.8V supply. Power
supply requirements allow operation from 1.2V to
2.8V. High power supply rejection ratio (PSRR), 83dB
at 217Hz, allows the device to operate in noisy
environments without additional power supply
conditioning. A low power shutdown mode reduces
supply current consumption to 0.01µA.
Superior click and pop suppression eliminates audible
transients on power-up/down and during shutdown.
The LM48861 is available in an ultra-small 12-bump,
0.4mm pitch, DSBGA package (1.215mm x
1.615mm).
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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.
PowerWise is a trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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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 © 2008–2013, Texas Instruments Incorporated