有没有用过ADS801的，请问它的25MHZ时钟如何产生？

DATASHEET里这样写的：

CLOCK REQUIREMENTS

The CLK pin accepts a CMOS level clock input. The rising and falling edges of the externally applied convert command clock controls the various interstage conversions in the pipeline. Therefore, the duty cycle of the clock should be held at 50% with low jitter and fast rise-and-fall times of 2ns or less. This is particularly important when digitizing a highfrequency input and operating at the maximum sample rate.

Deviation from a 50% duty cycle will effectively shorten some of the interstage settling times, thus degrading the SNR and DNL performance.

我用25MHZ的有源晶振，但示波器观察是三角波，不满足上面的要求把，请问应该怎么产生？谢谢！

直接用晶振一般无法达到要求，低成本的方案是，采用SN74LVC1G17对时钟信号进行整行，或采用SN74LVC2G14进行两次整形。

也可以选用高速的FPGA产生时钟信号。

你好！

可以参考网址http://www.ti.com.cn/product/cn/ads801#appNote中间的应用手册部分的clock solution。

谢谢！