LM48901 Datasheet, PDF (1/51 Pages) Texas Instruments – Audio Power Amplifier Series

LM48901
January 5, 2012
Quad Class D Spatial Array
General Description
The LM48901 is a quad Class D amplifier that utilizes Texas
Instruments’ proprietary spatial sound processor to create an
enhanced sound stage for portable multimedia devices. The
Class D output stages feature Texas Instruments’ edge rate
control (ERC) PWM architecture that significantly reduces RF
emissions while preserving audio quality and efficiency.
The LM48901’s flexible I²S interface is compatible with stan-
dard serial audio interfaces. A stereo differential-input ADC
gives the device the ability to process analog stereo audio
signals.
The LM48901 is configured through an I²C compatible inter-
face and is capable of delivering 2.8W/channel of continuous
output power into an 4Ω load with less than 10% THD+N. A
2.1 mode pairs two output drivers in parallel, increasing cur-
rent drive for 4Ω loads.
Output short circuit and thermal overload protection prevent
the device from being damaged during fault conditions. Su-
perior click and pop suppression eliminates audible transients
on power-up/down and during shutdown. The LM48901 is
available in space saving microSMD and LLP packages.
Key Specifications
■ SNR (A-Weighted)
■ Output Power/channel, PV_DD = 5V
R_L = 8Ω, THD+N ≤10%
R_L = 4Ω, THD+N ≤10%
■ THD+N
■ Efficiency/Channel
■ PSRR at 217Hz
■ Shutdown current
87dBA (typ)
1.7W (typ)
2.8W (typ)
0.06% (typ)
89% (typ)
71dB (typ)
1μA (typ)
Features
■ ^{Spatial Sound Processing}
■ ^{I2S Compatible Input}
■ ^{Differential-Input Stereo ADC}
■ ^{Edge Rate Control Reduces EMI while Preserving Audio}
Quality and Efficiency
■ ^{Paralleled Output Mode}
■ ^{Short Circuit and Thermal Overload Protection}
■ ^{Minimum external components}
■ ^{Click and Pop suppression}
■ ^{Micro-power shutdown}
■ ^{Available in space-saving micro SMD and LLP packages}
Applications
■ ^Laptops
■ ^Tablets
■ ^{Desktop Computers}
■ ^{Sound Bars}
■ ^{Multimedia Devices}
■ ^{MP3 Player Accessories}
■ ^{Docking Stations}
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