时钟分配芯片在高速并行数据采集中的应用

目前单片ADC很难同时实现高速和高精度采样,而多片ADC交替采样是提高系统采样率的一种有效方式。假设单片ADC的采样率为f,利用M片ADC进行并行采样,理论上可以把采样率提高到f.M。其中,采样时钟控制是多片ADC并行采样的关键技术之一。本文通过时钟分配芯片AD9510控制采样时钟,采用ADI公司的4片ADC芯片AD9481把实时采样率提高到单片采样率的4倍,即1GHz。

Application of Clock Dist ribut ion IC in High-speed Parallel Data Acquisition System

It is difficult to achieve high-speed and high-precision sampling with a single ADC, while a multi-ADC architecture effectively increases sampling rate. Assuming the sampling rate of single ADC is f, sampling rate can reach f·M with parallel M-chip ADCs. Contrl of the sampling clock is the key. Four AD9481 ADCs are used in the design, and AD9510 is used for clock control. Samping rate reaches 1 GHz with this method.