LM4921ITL/NOPB vs LM49250RL/NOPB
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | Texas Instruments | Texas Instruments |
| Description | IC AMP CLASS AB STER 50MW 20USMD | IC AMP CLSS D STER 2.43W 36DSBGA |
| Package | Tape & Reel (TR) | Tube |
| Series | Boomer® | Boomer®, PowerWise® |
| Type | Class AB | Class D |
| Features | DAC, I²S, Mute, Shutdown, SPI, Standby, Thermal Protection, Volume Control | 3D, Depop, Differential Inputs, I²C, Mute, Short-Circuit and Thermal Protection, Shutdown, Volume Control |
| Voltage - Supply | 2.6V ~ 5.5V | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 20-WFBGA, DSBGA | 36-WFBGA, DSBGA |
| Supplier Device Package | 20-DSBGA | 36-DSBGA (3.5x3.24) |
| Output Type | Headphones, 2-Channel (Stereo) | 2-Channel (Stereo) with Mono and Stereo Headphones |
| Max Output Power x Channels @ Load | 50mW x 2 @ 32Ohm | 2.43W x 2 @ 4Ohm; 170mW x 1 @ 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. What is a power amplifier and how is it different from an audio amplifier?
A power amplifier is a type of audio amplifier designed to drive high-power loads such as speakers. It is capable of amplifying audio signals to a sufficient power output to drive speakers to produce greater volume.
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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. 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.
