Silabs Si270x降EMI音频D类放大解决方案

Silabs公司的Si2704/05/06/07是降EMI的数字音频处理D类放大器,集成了功率级,PWM DAC和数字音频处理(DAP),以简化低成本高效率系统的设计. Si270x具有数字输入Delta-Sigma PWM,正在申请专利的降EMI,AM波段无噪音陷波滤波器,能向3欧姆BTL输出2x5W功率,PSRR大于50dB时的效率88%,THD优于0.1%时的动态范围为95dB,主要应用在PMP/MP3坞站,手持消费类电子,有源/无线扬声器,TV和监视器以及TV声卡等.本文介绍了Si2704/05/06/07主要特性, 功能方框图, 典型应用电路图和材料清单,以及多种系统配置图与Si270x-EVB D类放大器开发套件主要特性.

The Si2704/05/06/07 EMI mitigating 2.1 digital audio processing Class D amplifier integrates a power stage, PWM DAC, and digital audio processing (DAP) for simplified, low cost, power efficient system designs in consumer audio electronics. The digital input amplifier features delta-sigma PWM and innovative EMI mitigation technology for producing high-quality audio while effectively managing PWM switching noise for enhanced EMI compliance and AM/FM radio co-existence, while also being GSM/iPhone friendly.

Si2704/05/06/07主要特性:

Digital input Delta-Sigma PWM

Patent-pending EMI mitigation

AM radio band noise-free notch

GSM/iPhone friendly

Wideband PWM carrier spreading

Power stage slew rate control

Power stage feedback for PSR/THD

2x 5 W @ 3 ohm BTL; 2x 3 W @ 8 ohm BTL
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