Reading out data from daisy chained DAC's

Hi Tim Ikin ,
Thanks for reaching out to us.
The datasheet provides information in the "Readback Operation" section, as well as both the Daisy-Chain Timing Diagram and Readback Timing Diagram.
Can you share some of the SPI code sequences you tried so we can have more information to assist you? 

Regards,
Flynn

Hi Flynn,

  Thank you for your prompt response to my query.

  I managed to solve my issue this morning.

  The SPI code sequences which work successfully are as follows:

0x80 0x00 0x00 0x80 0x00 0x01    { This sets up DCEN }

0x80 0x00 0x00 0x80 0x00 0x01    { This sets up DCEN }

0x00 0x00 0x00 0x38 0x02 0x0C   { This sends the test 16b setting code (0x020C) to the FIRST DAC CH.B }

0x80 0x00 0x01 0x98 0x98 0x00   { Request readback from FIRST DAC CH.B register }

0x00 0x00 0x00 0xF0 0x00 0x00   { Flush the readback out of the FIRST DAC and through the SECOND DAC to the SDO of the second DAC. }

I hope this is useful to other people trying to implement this function.

Hi Flynn,

  Thank you for your prompt response to my query.

  I managed to solve my issue this morning.

  The SPI code sequences which work successfully are as follows:

0x80 0x00 0x00 0x80 0x00 0x01    { This sets up DCEN }

0x80 0x00 0x00 0x80 0x00 0x01    { This sets up DCEN }

0x00 0x00 0x00 0x38 0x02 0x0C   { This sends the test 16b setting code (0x020C) to the FIRST DAC CH.B }

0x80 0x00 0x01 0x98 0x98 0x00   { Request readback from FIRST DAC CH.B register }

0x00 0x00 0x00 0xF0 0x00 0x00   { Flush the readback out of the FIRST DAC and through the SECOND DAC to the SDO of the second DAC. }

I hope this is useful to other people trying to implement this function.

Hi Tim Ikin ,

Thanks for sharing. We also have 2 webinars about such topic that you might wanna check out:

SPI Timing and Digital Interface Challenges for Low Voltage Single Supply (LVSS) DACs

I2C Timing and Digital Interface Challenges for Low Voltage Single Supply (LVSS) DACs

Br,

Den