TS4902IST vs PAM8009DHR
| Part Number |
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| Category | Linear - Amplifiers - Audio | Linear - Amplifiers - Audio |
| Manufacturer | STMicroelectronics | Diodes Incorporated |
| Description | IC AMP AB MONO 700MW 8MINISO | IC AMP D/AB STEREO 3W 24SOP |
| Package | Cut Tape (CT) | Tape & Reel (TR) |
| Series | - | - |
| Type | Class AB | Class D, Class AB |
| Features | Depop, Standby, Thermal Protection | Depop, Mute, Thermal Protection |
| Voltage - Supply | 2.2V ~ 5.5V | 2.8V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 8-TSSOP, 8-MSOP (0.118\", 3.00mm Width) | 24-SOIC (0.295\", 7.50mm Width) |
| Supplier Device Package | 8-MiniSO | 24-SOIC |
| Output Type | 1-Channel (Mono) | 2-Channel (Stereo) with Stereo Headphones |
| Max Output Power x Channels @ Load | 700mW x 1 @ 8Ohm | 3W x 2 @ 4Ohm |
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1. What is an audio amplifier and what does it do?
An audio amplifier is a device that amplifies an audio signal, such as music or speech, to a higher voltage or current level to drive speakers or headphones, ensuring that the sound remains clear and accurate when played at higher volumes.
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2. 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. -
3. 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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4. 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.
