LM4921ITL/NOPB vs LM48822TL/NOPB
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | Texas Instruments | National Semiconductor |
| Description | IC AMP CLASS AB STER 50MW 20USMD | LM48822 GND-REF ULTRA HIGH PSRR |
| Package | Tape & Reel (TR) | Bulk |
| Series | Boomer® | Boomer® |
| Type | Class AB | Class AB |
| Features | DAC, I²S, Mute, Shutdown, SPI, Standby, Thermal Protection, Volume Control | Depop, Differential Inputs, I²C, Mute, Shutdown, Volume Control |
| Voltage - Supply | 2.6V ~ 5.5V | 2.4V ~ 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 | 16-WFBGA, DSBGA |
| Supplier Device Package | 20-DSBGA | 16-DSBGA (2.5x2.12) |
| Output Type | Headphones, 2-Channel (Stereo) | Headphones, 2-Channel (Stereo) |
| Max Output Power x Channels @ Load | 50mW x 2 @ 32Ohm | 40mW x 2 @ 32Ohm |
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1. 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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2. 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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3. How can I improve the thermal performance of my audio amplifier?
Audio amplifiers generate heat when they operate, especially Class A and Class AB amplifiers. Ways to improve heat dissipation include using a larger heat sink, adding a fan, or using a more efficient Class D amplifier. A good thermal design will improve the performance and life of the amplifier.
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4. What should the frequency response range of an audio amplifier be?
The frequency response range of a good quality audio amplifier is usually between 20Hz and 20kHz, which is the typical frequency range that the human ear can hear. A wider frequency response ensures that the audio amplifier can accurately reproduce both low and high frequency details.
