AS3561-DWLM ams

AS3561 Class-H Stereo Headphone Amplifier The AS3561 is a Class-H stereo headphone amplifier optimized General Description for usage within portable devices. The Class-H supply rail adaptation is implemented by an integrated DC/DC buck converter that takes its input directly from the battery. The continuous adoption of supply rails is done according to the input signal swing and load conditions. This architecture implements significant power savings compared to traditional Class-AB amplifiers. An IC control interface is implemented for a 32-step volume control including a mute function for each channel separately. The integrated charge pump generates a symmetric negative supply for true ground output signal levels without the need of output coupling capacitors. In addition it helps to lower the overall pop noise of the amplifier. A supervisory circuit is included for overtemperature and short-circuit protection. Differential inputs together with output ground sensing guarantees very low noise sensitivity. Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of the AS3561 Class-H stereo headphone amplifier, are listed below: Figure 1: Added Value of Using AS3561 Benefits Features Highly optimized system power H-Class amplifier with integrated DC/DC buck converter consumption 2x30mW, 0.02% THD 16 100dB SNR 0.9Vrms 1mA quiescent with both channels enabled Popless startup and mute/unmute Ultra low DC offset Full digital system control IC control interface Direct Li-Ion battery operation Wide supply range 2.3V to 5.5V No DC blocking capacitors Charge pump for true ground headphone operation Highest Noise Immunity Two fully differential stereo inputs with ground sensing input PCB area optimized Package: 0.4mm Pitch WL-CSP (1.615mm x 1.615mm) ams Datasheet (discontinued) Page 1 v1-08 2017-Jul-13 Document FeedbackAS35 61 Gene ral Des c rip t ion Applications The AS3561 applications include: Mobile Phones Portable Navigation Devices Media Devices Block Diagram The functional blocks of this device are shown below: Figure 2: AS3561 Block Diagram Page 2 ams Datasheet (discontinued) Document Feedback v1-08 2017-Jul-13