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ADF4159 external control of ramp steps

Question asked by Piri75 on Dec 19, 2017
Latest reply on Jan 10, 2018 by LEE.Y


I want to control each step of the ramp as described in data sheet for ADF4159 p.31 "External control of ramp steps".

I want a to generate a single sawtooth fsk ramp where I pulse TXdata to make one step on the ramp.

The following setup gives a single sawtooth that start with puls on TXdata.

When I set TX Ramp CLK to "1. TXdata" the ramp should start and take one step for each puls on TXdata that I generate externally. The following settings does not work.

Why is not a ramp generated when setting TX Ramp CLK to TXdata?