May I ask if the external reference voltage is still needed for the signal measurement of dc2222a-a demo board? Is it necessary to collect the data with DC890
The LTC2500-32 does not have an internal reference, so the external reference (LTC6655-5) is required.
Can this board read data directly, without going through DC890
The DC2222A-B needs a controller to configure the down-sampling factor and which data output is active. This is done using either the P1 (DC890) or J3 (DC590, DC2026) interface. Using the P1 connector it possible to run the ADC at full speed. Using the J3 connector full speed operation is not possible.
Can the spi interface above configure the sampling factor and those data outputs