Dear Srs,.
We are a medical equipment design company and we want to use the ADS1278 in a new project.
Our query: Is there any information on the ADS1278 power dissipation under different clock frequencies? We propose to use it at the lower end of the clock frequency and we assume that the consumption will be less than the nominal 50 mW at 27 Mhz, but ... how much smaller?
Thank you for your help.
Hello Daniel,
Thank you for your post and welcome to our forum!
Most of the power savings will come will come from the MODE selection. This will scale the input master clock (CLK) down to the internal clock frequency used by the delta-sigma modulator. This also has the effect of slowing down the digital circuitry and reduces the output data rate. Additional power savings will come from scaling the input clock down even further, but I don't have that data readily available.
For power dissipation with CLK = 27 MHz, you can see a notable difference in supply current and total power in the Electrical characteristics table:
What output data rate were you planning to configure in the ADS1278?
Hi Daniel,
That is certainly within the bounds of the Low-Speed mode.
One thing to keep in mind is that there is a slight reduction in performance compared to the high-resolution mode. Table 2. below summarizes this nicely.
Please let us know if you have any additional questions.
