The Class D, 2.1-Channel Audio Amplifier enhances sound throughout all volumes, important for superior audio in leisure and communication.
An audio amplifier is essential in sound methods as a result of it boosts low-level audio indicators to a degree appropriate for driving audio system, guaranteeing clear, highly effective sound output. This enhancement permits listeners to expertise high-quality sound throughout numerous volumes, making amplifiers indispensable in each leisure and communication gadgets. The reference design of a Class D, 2.1-Channel, Audio Amplifier by Analog Gadgets (ADI) is constructed right into a single, finely calibrated field enclosure that homes all of the electronics and speaker elements. It solely requires an exterior energy provide and a sign supply to operate totally.
This method incorporates two 2-inch loudspeaker drivers for the stereo left and proper channels, and a 5-inch loudspeaker for the subwoofer. A single MAX98400A amplifier operates in stereo mode for the left and proper channels, whereas one other MAX98400A is configured in mono mode to drive the subwoofer channel. The design is detailed in two principal elements: the digital circuitry and the speaker/enclosure meeting.
The design boasts a number of key options, together with a compact all-in-one format that operates on a single 12V to 20V DC energy provide. It achieves excessive SPL output from a small enclosure and makes use of a high-efficiency Class-D structure. Moreover, it consists of lively EQ with dynamic bass equalization, guaranteeing glorious sound high quality utilizing cost-effective drivers.
The enter stage serves each the left/proper channels and the subwoofer. A stereo, log-taper digital potentiometer controls the amount by adjusting the sign degree to the preamplifier. To stop floor loops, the enter makes use of differential sensing, and the RCA enter connectors are remoted from the system floor.
The design incorporates three channels for speaker energy amplification. A MAX98400A amplifier is about up in stereo mode to drive the left and proper audio system, offering 8Ω. The identical mannequin, configured in mono mode, serves because the amplifier for the subwoofer channel. By connecting the 2 Class D outputs of the MAX98400A in parallel in mono mode, the subwoofer channel can output 44W into 4Ω. The enter stage for the subwoofer makes use of the identical configuration because the left and proper channels. After this stage, the indicators for the left and proper are mixed by U5-B to type the mono subwoofer output. The acquire for the subwoofer channel on the summing amplifier is about by R303.
The subwoofer employs a 5-inch diameter Tymphany mannequin SLS-P830945 loudspeaker, which has a nominal impedance of 4Ω and a resonance frequency of 47.4Hz. For the left and proper channels, 2-inch Tymphany mannequin PLS-P830970 loudspeakers are used, every with a nominal impedance of 4Ω and a resonance frequency of 147.5Hz.
ADI has examined this reference design. It comes with a Invoice of Materials (BOM), schematics, and many others. You could find extra information concerning the reference design on the corporate’s web site. To learn extra about this reference design, click on right here.
