LM4853LD/NOPB vs BD5638NUX-TR
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | National Semiconductor | Rohm Semiconductor |
| Description | LM4853 MONO 1.5 W / STEREO 300MW | IC AMP CLASS D MONO 2.5W 8VSON |
| Package | Cut Tape (CT) | Tape & Reel (TR) |
| Series | Boomer® | - |
| Type | Class AB | Class D |
| Features | Depop, Shutdown, Thermal Protection | Depop, Differential Inputs, PWM, Short-Circuit and Thermal Protection |
| Voltage - Supply | 2.4V ~ 5.5V | 2.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 14-WFDFN Exposed Pad | 8-UFDFN Exposed Pad |
| Supplier Device Package | 14-WSON (4x4) | 8-VSON (3x2) |
| Output Type | 1-Channel (Mono) with Stereo Headphones | 1-Channel (Mono) |
| Max Output Power x Channels @ Load | 1.9W x 1 @ 3Ohm; 300mW x 2 @ 8Ohm | 2.5W x 1 @ 4Ohm |
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1. What is an audio amplifier and what does it do?
An audio amplifier is a device that amplifies an audio signal, such as music or speech, to a higher voltage or current level to drive speakers or headphones, ensuring that the sound remains clear and accurate when played at higher volumes.
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2. What is a Class D audio amplifier and what are its advantages?
Class D audio amplifiers work through Pulse Width Modulation (PWM) technology and have extremely high efficiency (typically up to 90% or higher), making them suitable for use in portable audio equipment or high-efficiency sound systems. It generates less heat because it reduces energy consumption.
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3. What is the signal-to-noise ratio (SNR) of an audio amplifier?
Signal-to-noise ratio (SNR) is a measure of the ratio of the audio signal to the background noise, with higher values indicating less noise in the audio signal. A high SNR usually means clearer sound output.
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4. Does the audio amplifier need to match the impedance of the speakers?
Yes, the output impedance of the audio amplifier should match the impedance of the speaker. Typically speakers have an impedance of 4Ω, 8Ω or 16Ω. Matching the impedance ensures that the amplifier delivers maximum power and the best sound quality from the speaker.
