PAM8009DHR vs LM4819MX/NOPB
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | Diodes Incorporated | National Semiconductor |
| Description | IC AMP D/AB STEREO 3W 24SOP | LM4819 350MW AUDIO AMPLIFIER WIT |
| Package | Tape & Reel (TR) | Bulk |
| Series | - | Boomer® |
| Type | Class D, Class AB | Class AB |
| Features | Depop, Mute, Thermal Protection | Depop, Differential Inputs, Shutdown |
| Voltage - Supply | 2.8V ~ 5.5V | 2V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 24-SOIC (0.295\", 7.50mm Width) | 8-SOIC (0.154\", 3.90mm Width) |
| Supplier Device Package | 24-SOIC | 8-SOIC |
| Output Type | 2-Channel (Stereo) with Stereo Headphones | 1-Channel (Mono) |
| Max Output Power x Channels @ Load | 3W x 2 @ 4Ohm | 350mW x 1 @ 16Ohm |
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1. 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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2. 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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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. 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.
