TPA2028D1YZFR vs LM4911QMM/NOPB
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | Texas Instruments | National Semiconductor |
| Description | IC AMP CLASS D MONO 3W 9DSBGA | LM4911Q-Q1 STEREO 40MW LOW NOISE |
| Package | Tape & Reel (TR) | Bulk |
| Series | SmartGain™ | Automotive, AEC-Q100, Boomer® |
| Type | Class D | Class AB |
| Features | AGC, Differential Inputs, DRC, I²C, Short-Circuit and Thermal Protection, Shutdown, Volume Control | Mute, Shutdown, Thermal Protection |
| Voltage - Supply | 2.5V ~ 5.5V | 2V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 105°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 9-UFBGA, DSBGA | 10-TFSOP, 10-MSOP (0.118\", 3.00mm Width) |
| Supplier Device Package | 9-DSBGA | 10-VSSOP |
| Output Type | 1-Channel (Mono) | Headphones, 2-Channel (Stereo) |
| Max Output Power x Channels @ Load | 3W x 1 @ 4Ohm | 145mW x 2 @ 16Ohm |
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1. 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. -
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.
