ADS1285: Can I use a 8MHz clock frequency instead of 8.196MHz ? What would this affect ?

There is a requirement for the ADC clock frequency in ADS1285. The recommended f_CLK value is 8.196MHz, but the allowed f_CLK range is 6-8.3MHz. Can I provide an 8MHz clock ( generated via PWM from a MCU ) ? How will this affect the operation of the ADC? Sorry, I did not find any description of the clock frequency other than 8.196MHz in the data sheet.

在ADS1285中有对于时钟频率的要求，推荐值是8.196MHz，但允许范围是6-8.3MHz。我能否提供8MHz时钟，这对ADC的工作有何影响？抱歉，我并未在数据手册中找到关于除8.196MHz时钟频率以外的介绍。

Taylor：

Hi,

Yes, you can use a clock frequency of 8MHz.  This will result in a slightly lower data rate for a given data rate setting.  For example, if the data rate is set to 1000sps and you use an 8MHz input clock frequency, then your actual data rate will be 1000*8/8.192=976.6sps.

Also, if you only plan to measure DC voltages up to a few Hz, then you can use an MCU clock output as long as the duty cycle is within 44% to 56%.  However, if you want to measure AC signals greater than a few Hz, you need to use a low jitter source clock, such as a good oscillator.