LM48822, LM48822TLEVAL
www.ti.com
SNAS456C – MAY 2008 – REVISED MAY 2013
LM48822 Boomer ™ Ground-Referenced, Ultra High PSRR, Ultra Low Noise,
35mW/Channel Stereo Headphone Amplifier with Common Mode Sense, and I2C Volume
Control
Check for Samples: LM48822, LM48822TLEVAL
FEATURES
DESCRIPTION
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The LM48822 is a single supply, ground-referenced
stereo headphone amplifier designed for portable
devices, such as cell phones, where board space is
at a premium. The LM48822 features TI’s groundreferenced architecture, which eliminates the large
DC blocking capacitor required by traditional
headphone amplifiers, saving board space and
minimizing system cost.
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Ground Referenced Outputs – Eliminates
Output Coupling Capacitors
Common-Mode Sense
Ultra-High PSRR
I2C Volume and Mode Control
High Output Impedance in Shutdown
Differential Inputs
Advanced Click-and-Pop Suppression
Low Supply Current
Minimum External Components
Micro-Power Shutdown
Available in Space-Saving 16-Bump DSBGA
Package
APPLICATIONS
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Mobile Phones
PDAs
Notebook PCs
Portable Electronic Devices
MP3 Players
KEY SPECIFICATIONS
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Output Power/Channel at VDD = 3.6V
– RL = 16Ω, THD+N ≤ 1%: 35mW (typ)
Output Power/Channel at VDD = 3.6V
– RL = 32Ω, THD+N ≤ 1%: 40mW (typ)
Quiescent Power Supply Current at 3.6V:
3.5mA (typ)
PSRR at 217Hz: 110dB (typ)
Shutdown Current: 0.06μA (typ)
The LM48822 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 LM48822 delivers 35mW/channel into a 16Ω
load with
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