PAM8009DHR vs LM4819LD/NOPB
| Part Number |
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | Diodes Incorporated | Texas Instruments |
| Description | IC AMP D/AB STEREO 3W 24SOP | IC AMP CLASS AB MONO 350MW 8WSON |
| Package | Tape & Reel (TR) | Tape & Reel (TR) |
| 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-WFDFN Exposed Pad |
| Supplier Device Package | 24-SOIC | 8-WSON (2.5x2.5) |
| 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. 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. 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 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 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.
