I'm working in a project, also with the AD9956, and I have the following doubts regarding the CML driver:
1: Did the AD9956 CML driver have integrated pullup collector resistors?
2: What´s the value in Ohms?.
3: In the datasheet, Analog specified that the Common-Mode Output Voltage is equal to 1,75 V. Under what conditions was calculated this parameter?.
4: Why is it used a 360 Ohm Voltage divisor at the CML driver output in the AD9956 Eval Board ? In my opinion is the Vcc= AVDD_CP/2 for collector resistors (if there is an integrated collector resistor), but it´s not clear in the documentation. Figure 1.
5: In the AD9956 Eval Board the differential impedance after DC block capacitor is 100 Ohm (two 50 Ohm resistors), why this specific value? Figure 1.
Thanks in advance to ENGINEERZONE.