The AD4 provides an Open Circuit Detection feature that will pull up voltage in order to identify open channels. Make sure to tie both ends of any unused channels (+/-) to Channel 16-, referred to as the Common Mode Reference Point (CMRP; isolated from system power/ground). Tying only one end of a channel, while leaving the opposing end open, may cause Open Circuit Detection to deliver unwanted voltages to your channels in use.

If tying unused channels to the CMRP is not obtainable, then the channels may be deactivated using the Active Channels register (0x1898). Additionally, deactivating these channels will also allow you to increase your sample rate on your active channels.

Note: Each bank needs to have the same number of channels “Active” (ex: 10 Channels, 5 channels per bank).