LM4673TM/NOPB vs LM4928SD/NOPB
| Part Number |
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | National Semiconductor | National Semiconductor |
| Description | LM4673 FILTERLESS, 2.65W, MONO, | LM4928 1.2 WATT STEREO FULLY DIF |
| Package | Bulk | Bulk |
| Series | Boomer®, PowerWise® | Boomer® |
| Type | Class D | Class AB |
| Features | Depop, Differential Inputs, PWM, Short-Circuit and Thermal Protection, Shutdown | Depop, Differential Inputs, Shutdown, Thermal Protection |
| Voltage - Supply | 2.4V ~ 5.5V | 2.4V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 9-WFBGA, DSBGA | 14-WFDFN Exposed Pad |
| Supplier Device Package | 9-DSBGA | 14-WSON (4x3) |
| Output Type | 1-Channel (Mono) | 2-Channel (Stereo) |
| Max Output Power x Channels @ Load | 2.65W x 1 @ 4Ohm | 2.2W x 2 @ 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. 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 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. How can I improve the thermal performance of my audio amplifier?
Audio amplifiers generate heat when they operate, especially Class A and Class AB amplifiers. Ways to improve heat dissipation include using a larger heat sink, adding a fan, or using a more efficient Class D amplifier. A good thermal design will improve the performance and life of the amplifier.
