Description: 1，初始化：
如果AD7705复位引脚直连VCC，最好在初始化程序中加入初始化序列，不然ready信号不会输出。
2，输入范围
如果AD7705采集单端信号，则输入必须在0到VDD之间，而不可以超出或为负，如果一个输入为负，则另一个输入会有灌入电流的现象，芯片无法正常运行。-AD7705 is a complete 16-bit A ö D converter. Within
Structure in Figure 1. If the external crystal oscillator, precision voltage reference and less
Amount of decoupling capacitance, A ö D to continuous conversion. It uses a
But lower-cost access to high-resolution 2- $ conversion technology
Operation, error-free access to 16-bit data output. This is a very
Consistent with the higher resolution but less demanding digital conversion
Applications such as digital audio products and intelligent instrumentation products.
Following a few important part of the device for a brief description and characteristics.
AD7705 programmable gain amplifier includes two full-differential
Sub-channel analog input.-Chip programmable gain amplifier PGA
Eight selectable gain 1,2,4,8,16,32,64,128
One can swing the scope of different types of input signal amplification to close
A ö D converter full scale voltage converter A ö D again, this favorable
On improving the q Platform: |
Size: 34816 |
Author: |
Hits:
Description: AW8145_单声道_无需滤波器_D类音频功率放大器详细中文资料，好不容易找到的-_ Without AW8145_ mono audio power amplifier filter _D detailed information in Chinese, finally found Platform: |
Size: 514048 |
Author: |
Hits:
Description: 单工无线呼叫系统分发射和接收两大部分。发射部分采用锁相环式频率合成器技术， MC145152和MC12022芯片组成锁相环，将载波频率精确锁定在35MHz，输出载波的稳定度达到4×10-5，准确度达到3×10-5，由变容二极管V149和集成压控振荡器芯片MC1648实现对载波的调频调制；末级功放选用三极管2SC1970，使其工作在丙类放大状态，提高了放大器的效率，输出功率达到设计要求。接收部分以超大规模AM/FM立体声收音集成芯片CXA1238S为主体，灵敏度、镜像抑制、信噪比等各项性能指标均达到设计要求；音频功率放大器采用集成芯片LM386，电压放大倍数最大为200。采用PT2262/2272编码/解码电路实现了数据传输业务以及对台号的选择等功能；音频输入和数据输入可自动转换；AT89S52作为整个系统的控制部分，程序设计采用C语言在KEIL51的编译器上编程实现；显示采用128×64点阵型液晶显示。经测试，整机功能齐全，各项性能指标符合系统要求，接收波形稳定，无明显失真。-The simplex wireless-calling system consists of two parts: transmit part and receive part.The transmit part adopts the phase-locked loop pattern of frequency synthesizing technology and uses the MC145152 and MC12022 chips to compose the phase-locked loop.It locks the frequency of the carrier-wave at 35MHz.The stabilization of the carrier-wave can be 4×10-5,the accuracy can be 3×10-5.The frequency modulation and the confection of the carrier-wave are realized by the capacity-changing diode V149 and the integration voltage-control oscillator MC1648 chip.The end power amplifier uses the audion 2SC1970 to make it work in the third magnifying state,it improves the efficiency of the magnifier and the power of the output reaches the design demand.The receive part uses the super cosmically AM/FM dimensional sound stereo radio reception integration chip CXA1238S as the main part.The sensitivity、the mirror-control restrain、the SNR and every capability index all reach the design demand.The audio Platform: |
Size: 626688 |
Author:周宇 |
Hits:
Description: The TPA2005D1 audio power amplifier evaluation module is a complete,
low-power single-channel audio power amplifier. It consists of the TI
TPA2005D1 1.1-W low-voltage class-D audio power amplifier IC in a very
small MicroStar Junior BGA package, along with a small number of other
parts mounted on a circuit board that is approximately one and a quarter
inches square (see Figure 1–1).-One-point video conferencing programs Platform: |
Size: 758784 |
Author:丁 |
Hits:
Search - audio amplifier c