ADF4360-5: Reference I/P signal

Question

Accepted Answer

Question We are driving the reference input of the device with a AD8170.
 The output of the AD8170 is a 66MHz square wave with a slew rate of 600V/uSec, 
 1.2Vp-p.
 Is this signal applicable with the ADF4360-5 device? Answer The REFIN input is a CMOS logic input, so therefore, you can either AC couple a 
 min signal level of 0.7volts or DC couple a TTL/CMOS square wave input signal.
 In your case, you could AC couple your input signal.

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ADF4360-5: FAQ