LM4876MM/NOPB vs LM49150TL/NOPB
| Part Number |
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | National Semiconductor | National Semiconductor |
| Description | LM4876 1.1W AUDIO POWER AMPLIFIE | LM49150 MONO CLASS D AUDIO SUBSY |
| Package | Bulk | Bulk |
| Series | Boomer® | Boomer® |
| Type | Class AB | Class D |
| Features | Shutdown, Thermal Protection | Depop, E²S, I²C, Mute, Shutdown, Thermal Protection, Volume Control |
| Voltage - Supply | 2V ~ 5.5V | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 10-TFSOP, 10-MSOP (0.118\", 3.00mm Width) | 20-UFBGA |
| Supplier Device Package | 10-VSSOP | 20-uSMD |
| Output Type | 1-Channel (Mono) | 1-Channel (Mono) with Stereo Headphones |
| Max Output Power x Channels @ Load | 1.5W x 1 @ 8Ohm | 2.1W x 1 @ 4Ohm; 42mW x 2 @ 32Ohm |
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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. How to choose a suitable audio amplifier?
When choosing an audio amplifier, factors such as output power, total harmonic distortion (THD), signal-to-noise ratio (SNR), efficiency, impedance matching (speaker impedance), and power consumption should be taken into consideration to ensure that it is well-matched with the speakers and audio source equipment.
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3. 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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4. What should the frequency response range of an audio amplifier be?
The frequency response range of a good quality audio amplifier is usually between 20Hz and 20kHz, which is the typical frequency range that the human ear can hear. A wider frequency response ensures that the audio amplifier can accurately reproduce both low and high frequency details.
