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APA2605---2.8W Stereo Class-D Audio Power Amplifier (with DC Volume Control, AGC Function)
The APA2605 is a stereo, high efficiency, filter-free ClassD audio amplifier available in SOP-18, SSOP-24, SSOP-24P, and QFN4x4-20A packages. The APA2605 provides the precise DC volume control, the gain range is from -80dB (VVOLUME =0V) to +20dB (VVOLUME =5V) with 64 steps precise control. 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 high, it could save the PCB space, system cost, simplifies the design and the power loss at filter. APA2605 provides an AGC (Non-Clip) function, and this function can low down the dynamic range for large input signal. APA2605 can provide from 20dB to -80dB with 64 steps gain decrease for non-clipping function, and this function can avoid output signal clipping. The APA2605 also integrates the de-pop circuitry that reduces the pops and click noise during power on/off or shutdown enable process. The APA2605 has build-in over-current and thermal protection that prevent the chip being destroyed by shortcircuit or over-temperature situation. APA2605 is capable of driving 2.8W at 5V into 4W speaker. The efficiency can archive 85% at RL =4W when PO =2.8W at VDD =5V
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