Hello,
What's the state of ADS7066's SDO pin while the AVDD (analog supply) is off but the DVDD is on? It looks the SDO level is still High and disturbs SPI communication of the other SPI slave devices on a shared SPI bus.
In the system, the ADS7066's AVDD is turned off when the system is put into a power-save mode. Hi-Z is expected at the SDO pin in this mode.
Best regards,
Shinichi Yokota