1FEATURES
2• Class G Power Savings
• Ground Referenced Headphone Outputs –
Eliminates Output Coupling Capacitors
• Common-Mode Sense
• I2C Volume and Mode Control
• High Output Impedance in Shutdown
• Differential Inputs
• Advanced Click-and-Pop Suppression
• Low Supply Current
• Low THD Mode Option

APPLICATIONS
• Mobile Phones, PDAs, MP3 Players
• Portable Electronic Devices, Notebook PCs

KEY SPECIFICATIONS
• Quiescent Power Supply Current at 3.6V:
0.9mA (typ)
• Output Power/Channel at VDD = 3.6V (RL = 16Ω,
THD+N ≤ 1%): 37 mW (Typ)
• Output Power/Channel at VDD = 3.6V (RL = 32Ω,
THD+N ≤ 1%): 29 mW (Typ)
• PSRR at 217Hz: 100 dB (Typ)
• Shutdown Current: 2.5 μA (Typ)

DESCRIPTION
The LM48824 is a Class G, ground-referenced stereo
headphone amplifier designed for portable devices.
The LM48824 features TI’s ground-referenced
architecture, which eliminates the large DC blocking
capacitors required by traditional headphone
amplifiers, saving board space and minimizing
system cost.
The LM48824 takes advantage of TI’s patent-pending
Class G architecture offering power savings
compared to a traditional Class AB headphone
amplifier. Additionally, output noise is improved by
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.
A high output impedance mode allows the LM48824's
outputs to be driven by an external source without
degrading the signal. Other features include flexible
power supply requirements, differential inputs for
improved noise rejection, a low power (2.5μA)
shutdown mode, and a 32-step I2C volume control
with mute function.
The LM48824's superior click and pop suppression
eliminates audible transients on power-up/down and
during shutdown. The LM48824 is available in an
ultra-small 16-bump, 0.4mm pitch DSBGA package
1.69mm x 1.69mm)