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RE: would ADS1298 external clock over 2.25MHZ?

Other Parts Discussed in Thread: ADS1293

Hi, Greg

I’d like to receive your comment for External Clock of ADS129x. 

I know that External Clock is 1.94~2.25MHz of ADS129x.

                     

Customer want to 600SPS setting.

Because ECG and other product need 600SPS solution.

500SPS is fCLK= 2.048MHz.

I think, 600SPS is fCLK=2.4576MHz, but datasheet External Clock is 1.94~2.25MHz.

If you have any solution, Please send me your comment.

 

from Eddy

(eddy.lee@avnet.com)

 

 

  • Mr Lee -

    It may be possible to get something close using a multiple of 600 Hz (ie 1200, 1800, etc), but ultimately, they will have to do a sample rate conversion either way.  Sampling at a higher frequency and the down sampling the data is probably the easiest.

    An additional alternative since the sample rate is slow, may be to using the START pin to initiate the data conversions at the desired rate.  This method will not be as accurate timing and they would need to be careful to meet all the timing specifications.

  • Hi Eddy,

    If for your purpose eight channels is not crucial. please  look for ADS1293 - this ADC has more flexible digital filter to setup output data rate.