This article introduces the main features of Si2704 / 05/06/07, functional block diagram, typical application circuit diagram and bill of materials, as well as various system configuration diagrams and main features of Si270x-EVB Class D amplifier development kit.
Silabs ’Si2704 / 05/06/07 is an EMI-reducing digital audio processing class-D amplifier that integrates a power stage, PWM DAC, and digital audio processing (DAP) to simplify the design of low-cost, high-efficiency systems. The Si270x has digital inputs Delta-Sigma PWM, patent pending EMI reduction, AM band noise-free notch filter, can output 2x5W power to 3 ohm BTL, efficiency is 88% when PSRR is greater than 50dB, and dynamic range is 95dB when THD is better than 0.1% , Mainly used in PMP / MP3 docking stations, handheld consumer electronics, active / wireless speakers, TVs and monitors, and TV sound cards.
Si2704 / 05/06/07 Application:
PMP / MP3 docking staTIons
Portable consumer audio electronics
Table top and portable radios
AcTIve / wireless speakers
TVs and monitors
TV sound bars 
Figure 1. Si2704 / 05/06/07 functional block diagram 
Figure 2. Si2704 / 05/06/07 Typical Application Circuit Diagram Typical Application Circuit Bill of Materials (BOM): 
Figure 3. Si270x PMP dock system basic configuration diagram 
Figure 4. Si270x PMP docking station system configuration with radio and digital media control 
Figure 5. Si270x stereo bidirectional speaker system configuration diagram 
Figure 6. Si270x TV sound card system configuration diagram
Si270x-EVB Class D Amplifier Development Kit
Si270x-EVB Class D Amplifier Development Kit 
Figure 7. Si270x-EVB Class D amplifier development kit outline drawing
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:
EMI miTIgation
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
Audio cable
Documentation and software CD
The shipboard power cables manufactured by Jiangsu Jiangyang Special Cable Co,.Ltd. includes XLPE insulated flame retardant shipboard power cables, XLPE insulated flame retardant shipboard power cables(single sheath), XLPE insulated fire resistant shipboard power cables and XLPE insulated fire retardant shipboard power cables(single sheath).
The shipboard power cables are intended for power, lighting and control system of shipboard and off-shore building, and it also can be used by metallurgical industry, chemical works, power plant and mine etc.
Standards applied:
IEC60092-350
IEC60092-353
IEC60092-360
IEC60228
IEC60332-1-2
IEC60332-3-22
Product making: factory name, type, rated voltage.
Core making: colour making or printed numbers.
High Voltage Power Cables,Marine Power Cable,Flame Retardant Marine Cable
Jiangsu Jiangyang Special Cable Co,.Ltd. , https://www.jymarinecable.com