LM48555TL/NOPB vs LM4859TL/NOPB
| Part Number |
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | Texas Instruments | Texas Instruments |
| Description | IC AMP CLASS AB MONO 12USMD | IC AMP CLASS AB STER 1.6W 30USMD |
| Package | Tape & Reel (TR) | Bulk |
| Series | Boomer® | Boomer® |
| Type | Class AB | Class AB |
| Features | Depop, Differential Inputs, Shutdown | 3D, Depop, I²C, Mute, Shutdown, Thermal Protection, Volume Control |
| Voltage - Supply | 2.7V ~ 9V | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 12-WFBGA | 30-WFBGA |
| Supplier Device Package | 12-uSMD (1.46x1.97) | 30-DSBGA |
| Output Type | 1-Channel (Mono) | 2-Channel (Stereo) with Stereo Headphones |
| Max Output Power x Channels @ Load | - | 1.6W x 2 @ 4Ohm; 75mW x 2 @ 32Ohm |
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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 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. 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.
