ad7091R

EHILLEL820,

You absolutely can read from channel 0 to channel 3 (1-4) in sequential order.   Assuming you are using the AD7091R-4, you can simply program the channel register (ADDR = 0x01) with code 0x000F to enable channels 0 to 3 for conversion.  

If you meant that you are using the 8 channel, AD7091R-8 and you want to convert channels VIn1 to Vin4 then simply write 0x001E to the Channel register.

More information on device configuration can be found in the datasheet 

https://www.analog.com/media/en/technical-documentation/data-sheets/AD7091R-2_7091R-4_7091R-8.pdf

starting on page 23.

EHILLEL820,

You absolutely can read from channel 0 to channel 3 (1-4) in sequential order.   Assuming you are using the AD7091R-4, you can simply program the channel register (ADDR = 0x01) with code 0x000F to enable channels 0 to 3 for conversion.  

If you meant that you are using the 8 channel, AD7091R-8 and you want to convert channels VIn1 to Vin4 then simply write 0x001E to the Channel register.

More information on device configuration can be found in the datasheet 

https://www.analog.com/media/en/technical-documentation/data-sheets/AD7091R-2_7091R-4_7091R-8.pdf

starting on page 23.