TMS320VC54XX与串行A/D接口设计

Interface Design of Serial A/D Converter and TMS320VC54XX

并行模数转换器与DSP连线复杂,而且需要设计相应的译码电路,所以在一定程度上引入了干扰和不稳定因素。根据高速定点DSP芯片TMS320VC5416多通道缓冲串口的特点和串行模数转换芯片AD7274的工作特性,提出了使用串行A/D转换器AD7274作为DSP系统的模拟量输入部分,解决了以往基于并行数据传输的A/D转换器接口复杂问题。在此基础上介绍了串行A/D与TMS320VC5416DSP的McBSP接口设计方法,给出具体的硬件设计和与之相关的软件设计。实现了接口电路简单化并且保证了系统工作的稳定性。

Connection between parallel-based A/D converter and DSP was complicated and need to design a corresponding coding electrocircuit, so interferential and instability factor in some degree were introduced. A method of taking serial A/D converter AD7274 as analog signal input of DSP system was put forward, the method considered Multi-channel Buffered Serial Port （McBSP） characteristics of high speed fix-point Digital Signal Processor TMS320VC5416 and operational principles of the A/D converter. It can solve the complicated problem of A/D converter interface by means of parallel data transmission system. On the basis of this, the interface design method of the McBSP of TMS320VC5416 DSP and serial A/D converter was discussed. The hardware design and the corresponding software design were given. And the simplified performances of interface was also realized so as to ensure operation stability of the system.