LM49270SQ/NOPB vs TAS5709PHPR
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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 | Tape & Reel (TR) |
| 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. 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 Total Harmonic Distortion (THD) of an audio amplifier?
Total Harmonic Distortion (THD) is the distortion component introduced by an audio amplifier during the signal amplification process. the lower the THD, the closer the amplified audio signal will be to the original signal, and usually high quality audio amplifiers have a THD value of less than 1%.
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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.
