The Vcm on My Demo board DC1751 doesn't have output,is it wrong?And what the output type of FR and DCO ?LVDS?
@edison566 is available on JP1 on pins 7, 19, 31 and 43.
The outputs FR DCO and the data are all serial LVDS signals.
@Clarence.Mayott But I didn't get a valid output on Vcm,the voltage of Vcm is almost nearly 0,I measured.And when I measured the voltage of the first input pin Ain1+,Ain1-,I got a 1.8V output.Others doesn't have the same level.
I found the Ain1- was shorted with VDD just now.I guess the diode in the chip was breakdown.But I don't why Vcm doesn't have output
Can you send a picture of your setup and how you are probing Vcm?
Oh! Are you in parallel mode or serial mode?
If you put the part in parallel programming mode you will need to change the other jumpers as well, especially JP9 which is the shutdown pin. If it is pulled high then the part will be shut down. Change the jumper setting on JP9 and see if that fixes things.