LM4991LDX/NOPB vs LM4898MM/NOPB
| Part Number |
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | Texas Instruments | National Semiconductor |
| Description | IC AMP CLASS AB MONO 3W 8WSON | LM4898 1 WATT FULLY DIFFERENTIAL |
| Package | Cut Tape (CT) | Bulk |
| Series | Boomer® | Boomer® |
| Type | Class AB | Class AB |
| Features | Depop, Shutdown, Thermal Protection | Depop, Differential Inputs, Shutdown, Thermal Protection |
| Voltage - Supply | 2.2V ~ 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 | 8-WDFN Exposed Pad | 10-TFSOP, 10-MSOP (0.118\", 3.00mm Width) |
| Supplier Device Package | 8-WSON (4x4) | 10-VSSOP |
| Output Type | 1-Channel (Mono) | 1-Channel (Mono) |
| Max Output Power x Channels @ Load | 3W x 1 @ 3Ohm | 1.4W x 1 @ 4Ohm |
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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 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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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.
