ADI SSM6515超低功耗D类音频放大器解决方案

ADI公司的SSM6515是高度集成高效率超低功耗单声道D类音频放大器,具有很适合用于无线耳机的数字输入.应用电路仅需要很少的外接元件,工作电压从1.8 V (PVDD)低电源和1.2V到1.8V(IOVDD)电源.这些和1.8V信令能共享.器件能向16 Ω负载提供<1%总谐波失真+噪音(THD+N)的连续输出功率85mW.器件具有2.57 μV rms噪音, 113 dB A加权信噪比和动态范围, 30 mW, 1 kHz输出32 Ω 负载的THD+N为0.003%,I2C控制有多达4引脚可选择地址或单调的操作.有多种串行数据格式,TDM,I2S或左对齐从,PDM输入从2.8224 MHz 到12.288 MHz. 支持取样速率从8 kHz 到 768 kHz,具有灵活数字增益调整,具有可编角频率的DC阻隔高通滤波器,高性能模式的典型空闲功率为1.55mW,低功耗模式以降低功耗,灵活的输出增益限制器和剪裁技术,具有零数字输入的自动降功耗特性,短路保护和杂音抑制器,用户可选择的超低EMI发送模式,加电复位(POR), 1.8 V PVDD电源,1.2 V 到1.8 V IOVDD电源,采用11凸0.984 mm × 1.444 mm, 0.35 mm间距WLCSP封装.主要用在无线耳机,有源噪音抑制耳机,智能手机耳机扬声器,助听器和手持电子设备.本文介绍了SSM6515主要特性,功能框图,典型应用电路图以及评估板EVALSSM6515Z主要特性,电路图,材料清单和PCB设计图.

The SSM6515 is a fully integrated, high efficiency, mono Class-D audio amplifier with digital input that is ideally suited for use in wireless headphones. The application circuit requires few external components and operates from a 1.8 V (PVDD) supply and a 1.2 V

to 1.8 V (IOVDD) supply. With 1.8 V signaling, these can be shared. It can deliver 85 mW of continuous output power into a 16 Ω load with <1% total harmonic distortion plus noise (THD + N).

The SSM6515 features a high efficiency, low noise modulation scheme that requires no external inductor/capacitor (LC) output filters. This scheme continues to provide high efficiency even at very low output power resulting in battery life savings compared to conventional headphone amplifiers. The device operates with > 90% efficiency at 55 mW into a 16 Ω load and it has a signal-to-noise ratio (SNR) of 113 dB, A weighted. Spread spectrum, stable common-mode pulse density modulation provi...