Keep in mind that the sync input has a 50 ohm termination resistor, so you need a signal generator capable of providing at least a ~3 V pulse across 50 ohms. You definitely do not want to drive this input with a square wave because the 50 ohm termination resistor is small (0603 or so) so with a nominal pulse of 5V, the resistor will be dissipating 0.5W which is fine for a 10 microsecond pulse every second, but dangerous at 50% duty cycle. Glenn
On Sun, Jan 31, 2010 at 10:53 PM, Wei Chung Hsieh < [email protected]> wrote: > Dear dan, > > > > Thanks very much for your information. > > I’ve tried to drive a 1Hz square wave (50% duty cycle) or 1Hz pulse ( pulse > width 100 micro second) into the iADC. > > But it’s still not working and shows the same error message. > > > > Thanks and Regards, > > Wei-Chung >
