LM48861_14 Datasheet, PDF (1/20 Pages) Texas Instruments – Ground-Referenced, Ultra Low Noise, Stereo Headphone Amplifier

LM48861, LM48861TMBD
www.ti.com
SNAS450A – JUNE 2008 – REVISED MARCH 2010
LM48861
Ground-Referenced, Ultra Low Noise, Stereo
Headphone Amplifier
Check for Samples: LM48861, LM48861TMBD
FEATURES
1
•2 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 microSMD
package
APPLICATIONS
• Mobile Phones
• Portable electronic devices
• MP3 Players
DESCRIPTION
The LM48861 is a single supply, ground-referenced stereo headphone amplifier. Part of National'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, micro SMD package (1.215mm x 1.615mm).
■ Output Power/channel at
V_DD = 1.5V, THD+N = 1%
R_L = 16Ω
R_L = 32Ω
■ Output Power/channel at
V_DD = 1.8V, THD+N = 1%
R_L = 16Ω
R_L = 32Ω
■ Quiescent Power Supply Current
at 1.5V
■ PSRR at 217Hz
■ Shutdown Current
Table 1. Key Specifications
VALUE
12mW (typ)
13
UNIT
mW (typ)
24mW (typ)
22
mW (typ)
2mA (typ)
83
0.01μA (typ)
dB (typ)
1
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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.
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