2.3W Ultra-Low-EMI Filterless Class D Audio Amplifier
Description
19-3405; Rev 3; 5/09
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KIT ATION EVALU LE B A IL A AV
2.
3W, Ultra-Low-EMI, Filterless, Class D Audio Amplifier
General Description Features
o Filterless Amplifier Passes FCC-Radiated Emissions Standards with 24in of Cable o Unique Spread-Spectrum Mode and Active Emissions Limiting (AEL) Achieves Better than 20dB Margin Under FCC Limits o Zero Dead Time (ZDT) H-Bridge Maintains Stateof-the-Art Efficiency and THD+N o Simple Master-Slave Setup for Stereo Operation o Up to 90% Efficiency o 2.
3W into 4Ω (1% THD+N) o Low 0.
02% THD+N (POUT = 1W, VDD = 5.
0V) o High PSRR (75dB at 217Hz) o Integrated Click-and-Pop Suppression o Low Quiescent Current (5.
4mA) o Low-Power Shutdown Mode (0.
3µA) o Short-Circuit and Thermal-Overload Protection o Available in Thermally Efficient, Space-Saving Packages 10-Pin TDFN (3mm x 3mm x 0.
8mm) 12-Bump UCSP (1.
5mm x 2mm x 0.
6mm) o Pin-for-Pin Compatible with the MAX9700 and MAX9712
MAX9705
The MAX9705 3rd-generation, ultra-low EMI, mono, Class D audio power amplifier provides Class AB performance with Class D efficiency.
The MAX9705 delivers 2.
3W into a 4Ω load and offers efficiencies above 85%.
Active emissions limiting (AEL) circuitry greatly reduces EMI by actively controlling the output FET gate transitions under all possible transient output-voltage conditions.
AEL prevents high-frequency emissions resulting from conventional Class D free-wheeling behavior in the presence of an inductive load.
Zero dead time (ZDT) technology maintains state-of-the-art efficiency and THD+N performance by allowing the output FETs to switch simultaneously without cross-conduction.
A patented spreadspectrum modulation scheme eliminates the need for output filtering found in traditional Class D devices.
These design concepts reduce an application’s component count and extend battery life.
The MAX9705 offers two modulation schemes: a fixedfrequency (FFM) mode and a spread-spectrum (SSM) mode that further reduces EMI-radiated emissions due t...
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