Other Parts Discussed in Thread: ADS1293
Hi,
The ADS1293 needs either a 4.096MHz crystal or an external 409.6kHz clock. We have a problem finding the right solution as we have restrictions in our design which limits the possibilities:
- Limited space (e.g. max. component height 1.1mm).
- Limited power (max. 1-2 mA for ADS1293 frontend including clock).
- 30ppm precission.
We have not been able to identify any crystals in that frequency range smaller than 8x4.5x1.7mm so because of the heigth restriction crystals is not the solution.
Potentially we can generate the clock in our host processor, but because of other limitations we wont be able to optimize it for a low power mode as processor crystal frequency is to high and we would need to keep it active continuosly.
The best solution seems to be an external oscillator running at a small sized crystal (above 10MHz) but current consumption is an issue.
Other solutions have been considered like ceramic resonator (precission to low) and discrete crystal oscillator (current consumption to high).
Do you have any suggestions for a good solution within the given restrictions?
BR Tommy
