This is a query regarding the observance of signal on VTUNE pin of HMC832A. Upon updating the PLL output frequency from the GUI provided with the evaluation board of HMC832A, a low pulse of duration of the order of tens of milli-seconds is captured by oscilloscope. Along with VTUNE signal, the SDO signal is also held low during the same time. It is also noted that the VTUNE signal falls gradually within few micro-seconds at falling edge of the pulse, and it rises gradually and settles to about 1.8V at the rising edge of the pulse. I sincerely request to you to provide explanation for this behavior yet not understood. I am, herewith, attaching the screenshots of the observations. The VTUNE and SDO signals, as shown in screenshots, are of green and yellow color respectively. Thank you.
[edited by: RSB at 2:14 PM (GMT -4) on 11 Aug 2021]