LM49270SQ/NOPB vs TAS5709APHPR
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | National Semiconductor | Texas Instruments |
| Description | LM49270 FILTERLESS 2.2W CLASS-D | IC AMP CLSS D STER 20.6W 48HTQFP |
| Package | Bulk | Cut Tape (CT) |
| Series | Boomer® | - |
| Type | Class D | Class D |
| Features | 3D, Depop, I²C, Short-Circuit and Thermal Protection, Shutdown, Volume Control | Depop, Jinftrytal Inputs, I²C, I²S, Mute, Short-Circuit and Thermal Protection, Shutdown, Volume Control |
| Voltage - Supply | 2.4V ~ 5.5V | 8V ~ 24V |
| Operating Temperature | -40°C ~ 85°C (TA) | 0°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 28-WFQFN Exposed Pad | 48-PowerTQFP |
| Supplier Device Package | 28-WQFN (5x5) | 48-HTQFP (7x7) |
| Output Type | 2-Channel (Stereo) with Stereo Headphones | 2-Channel (Stereo) |
| Max Output Power x Channels @ Load | 2.2W x 2 @ 4Ohm; 177mW x 2 @ 16Ohm | 20.6W x 2 @ 8Ohm |
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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 types of audio amplifiers are available?
Common types of audio amplifiers include:
Class A amplifiers: have the highest sound quality, but are less efficient.
Class B amplifiers: More efficient, but may produce crossover distortion.
Class AB amplifiers: between Class A and Class B with good balance.
Class D amplifier: highest efficiency, suitable for portable devices, but slightly lower sound quality. -
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.
