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.
PMP/MP3 docking stations
Portable consumer audio electronics
Table top and portable radios
TVs and monitors
TV sound bars
Si270x-EVB Class D Amplifier Development Kit
The Si270x Class D amplifier EVB consists of a baseboard and a daughter card. The baseboard is common and shared among all the Si270x 5 W per channel Class D audio amplifier daughter cards. The Si270x-EVB kit addresses the entire Si270x family of Class D amplifier products.
The daughter card is populated with the Si2707 Class D amplifier which provides the following:
Volume and tone controls
EQ and Dynamic Range Compressor DSP functions
Tunable noise-free notch for AM radio coexistence
The Si270x Class D amplifier EVB is supported by a full function graphical user interface (GUI) that runs on a standard PC and is connected to the EVB via USB. The baseboard includes the Si4730 AM/FM tuner, a stereo analog input, as well as an optical SPDIF input for digital audio sources. The daughter card also includes the required output filtering network. Speakers with impedances of 4 Ω and larger may be directly driven from this board; a separate line level output is provided.
The Si270x-EVB Class D Amplifier development kit includes:
Si270x Evaluation Board
External power supply
AM/FM adapter card and antennas cable
Documentation and software CD