茂達 ANPEC 推出 APA2609 3W Stereo Class D Audio Power Amplifier and Class
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茂達 ANPEC 推出
Product Number Package Key Features Description 
APA2609AQAI-TRG QFN3x3-20 3W Stereo Class D Audio Power Amplifier and Class AB Headphone Driver (DC Volume Control, UVP, AGC) The APA2609 provides DC volume control, gain range is from +20dB (VVOLUME=0V) to -80dB (VVOLUME=5V) with gain range from. It’s easy to get the suitable amplifier’s gain with the 64 steps gain setting. The filter-free architecture eliminates the output filters compared to the traditional Class-D audio amplifier, and reduces the external component counts and the components height, it could save the PCB space, system cost, simplifies the design and the power loss at filter.
APA2609 provides an AGC (Non-Clip) function, which limits output swing from overstress speaker. It reduces internal gain instead of clipping peak to maintain low THD.
The APA2609 also integrates the de-pop circuitry that reduces the pops and click noises during power on/off or shutdown enable process.
The APA2609 has built-in over-current and thermal protection that prevent the chip being destroyed by short circuit or over temperature situation.
APA2609 combines a stereo bridge-tied loads (BTL) mode for speaker drive and a stereo single-end (SE) mode for headphone drive into a single chip, where both modes are easily switched by the SE/BTL input control pin signal.
APA2609 is capable of driving 3W at 5V into 4Ω speaker.
The efficiency can archived 85% at RL=4Ω when PO=3W at VDD=5V.
APA2609 is capable of driving 75mW at 5V into 32Ω Headphone.
UVP function minimize power off induced pop noise.



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