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DAC38RF85: Loopback

Part Number: DAC38RF85

Section 8.3.1 of the datasheet ( bottom of page 39 ) references a LOOPBACK setting in SRDS_CFG1 register.

The section (8.5.86) describing the SRDS_CFG1 register has no LOOPBACK setting.

What is the loopback function and how can we control it ?