LM48822TL/NOPB vs LM4921ITL/NOPB
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | National Semiconductor | Texas Instruments |
| Description | LM48822 GND-REF ULTRA HIGH PSRR | IC AMP CLASS AB STER 50MW 20USMD |
| Package | Bulk | Tape & Reel (TR) |
| Series | Boomer® | Boomer® |
| Type | Class AB | Class AB |
| Features | Depop, Differential Inputs, I²C, Mute, Shutdown, Volume Control | DAC, I²S, Mute, Shutdown, SPI, Standby, Thermal Protection, Volume Control |
| Voltage - Supply | 2.4V ~ 5.5V | 2.6V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 16-WFBGA, DSBGA | 20-WFBGA, DSBGA |
| Supplier Device Package | 16-DSBGA (2.5x2.12) | 20-DSBGA |
| Output Type | Headphones, 2-Channel (Stereo) | Headphones, 2-Channel (Stereo) |
| Max Output Power x Channels @ Load | 40mW x 2 @ 32Ohm | 50mW x 2 @ 32Ohm |
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1. 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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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. 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.
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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.
