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AD9826: Setting Up Clamping Voltage

Question asked by bchan on Apr 19, 2016
Latest reply on Jan 31, 2017 by EBarnes

I am using the 1-Channel CDS mode of AD9826.  Internal reference is used and the 4V clamping voltage is selected.

Q1.) The time constant is 5K x 0.1u = 500us. The CDSCLK1 pulse width is only 16ns. What is the proper way to set up clamping voltage?

Q2.) When the CDSCLK1 was set high to close switch S4 for more than 300us, the internal clamping voltage (measured at pin OFFSET) began to droop, by about 1V.  Is this normal?