Can we send FTW for NCO thru SERDES? If it is from SPI, how many clock cycles do it take tune from one frequency to other.? What is the specification difference between AD9172/3?
FTWs are only be configured through the SPI. Two ways for frequency hopping, how long it takes is up to SPI writings and SPI speed.
1) two frequencies back and forth. AD9172 has cal NCO at the end of datapath that is in parallel with main NCO. One SPI writing to hop back and forth.
2) update all the FTWs. 7 SPI writings ( 6 FTWs + 1 update)
One of the big differences between AD9172 and AD9173 is the max data rate at 16b.
AD9172 - 1.5Gsps at 16b
AD9173 - 1.2xGsps at 16b.
please refer to the datasheet for further details.
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