Hello,
One solution is to use a packaged oscillator, and drive both devices with the output from this. However, if you wish to retain the use of a simple crystal for other reasons, including cost, the following may be a possibility.
It appears that the ADS1241 may have internal biasing arrangements, since an external resistanc is not requird between the Xin and Xout pins. You can check this by measuring the DC voltage at both pins, without a crystal connected - the pins should be biased in the region of Vdd/2 level.
Assuming that internal biasing is present, the idea is to connect the crystal to the MCU in the normal fashion, and then provide capacitive coupling (say 47p or 100p) between the XTAL pin of the MCU and the Xin pin of the ADC device. The AC coupling is necessary because the voltage swing at the XTAL pin may be less than the full logic swing. When determining the capacitor value at the XTAL pin, you may need to take into account the input capacitance at the Xin pin, and any additional stray capacitance for the interconnection. Needless to say, the two devices should be in relatively close proximity to each other to minimize the stray capacitance.
With this method, the HGO bit in the ICSC2 register should be set for high gain mode.
Regards,
Mac
