Yatao, You can use +3.3V for both supplies. You can connect pin 25 to GND but would recommend leaving it unconnected per the data sheet. You can clock the device at 150MHz. Not sure what you are asking in your last question. Is this regarding the Lecroy pulse generator the AD9740 is showing in the data sheet for a clock source? If so, I do not see a problem using this. Regards, Jim
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