Question ADF4252 EB1 User Guide Answer Please refer to the attached technical documents for ADF4252EB1 and ADF4252EB2

ADF4252: Is power supply required to IF section if only using RF channel only?

Question If we use the RF channel only, do we need to provide the power supply to IF channel or can we leave the pins for IF channel float? Answer To avoid internal protection diodes being turned on – it is better to supply power to the IF channel. In this case just tie the IF power pins (Vdd2/Vp2) to the RF power pins. When configuring the part the datasheet mentions (pasted below) you do not need to write to the IF registers. this will ensure the IF channel stays in powerdown. You can leave the IF input pins IFINa/IFINb floating. All GND pins should be common. “It is necessary to write only to Registers R3, R2, R1, and R0 when powering up the RF synthesizer only. The IF side will remain in power-down until Registers R6, R5, R4, and R3 are written to.”

ADF4252_power supply to IF section while only using RF-1

Question Pls help to clarify on the point for ADF4156; ADIsimPLL is supporting the frequency of 102.2Mhz but data sheet is not covering this band (page 3.) Answer I just have a test with the ADIsimPLL v1.3. But I don't find the problem. 1) the ADIsimPLL can not support 102.2MHz with ADF4156 2) the ADIsimPLL can support 4.93GHz to 5.83GHz with ADF4108, I don't find the error. BTW, in fact, ADF4156 can support a 102.2MHz. although in datasheet, it says RF input should be 0.5GHz to 6GHz. But please note the test condition column. and if you can have a high slew rate input, the input freqency could be lower than 0.5GHz.

ADF4252 EVB User Guide

Question Where can I find the ADF4252 EB1 and EB2 User Guide? Answer Please refer to the attached. (always check www.analog.com for latest documentation)