AD9233: 0x18 register setting the input range

Q

Regarding the 0x18 register shown in page 26 of the datasheet, the internal
reference of AD9233 is 0.5V. There is no description of the internal reference
resistor divider inside the chip in the datasheet. Would you please clarify the
function of this register?

A

Register 0x18 sets the full scale input range of the AD9233 (VREF as shown in
the attached table, not exactly accurate description). If the SENSE pin is
tied to GND which sets a nominal 1.0V VREF (2Vp-p full scale input span nominal
– see Table 9), then register 0x18 can be used to change the full scale input
span between 1.25 and 2.00V.