Other Parts Discussed in Thread: CDCE6214
Hi,
I *had* a circuit working fine for a few months, then all of a sudden the CDCE6214 won't lock any more to the 10MHz input clock.
The output of U11 is clean. Nice LVDS with 400mV swing on each line, centered around 1.2V.
However, despite me loading the correct (and same configuration since 3 months), now on the PRIREF input of U15 (the CDCE6214) is centered around 0V (which seems like a big problem to me).
So my question are:
* Shouldn't the CDCE6214 polarize the LVDS lines to be centered around 1.2V?
* What input common mode does the CDCE6214 expect (couldn't find the info in the datasheet).
I have changed the chip 3 times, to no avail. always the same problem: will never lock to the 10MHz input LVDS clock. Also, the CLK_OUT_P/N from U15 is flat, (according to configuration, it should be outputting 10MHz, as was the case before it stopped locking). That makes me think that the CDCE6214 is not seeing any input for some reason.
Any hints on where to look next?
I have attached my TICS pro register dump.
R85 0x00550000 R84 0x00540000 R83 0x00530000 R82 0x00520000 R81 0x00510004 R80 0x00500000 R79 0x004F0008 R78 0x004E0000 R77 0x004D0000 R76 0x004C0008 R75 0x004B0008 R74 0x004AA181 R73 0x00492000 R72 0x00480006 R71 0x00470000 R70 0x00460008 R69 0x0045A181 R68 0x00442000 R67 0x00430006 R66 0x00420006 R65 0x00410808 R64 0x0040A181 R63 0x003F0000 R62 0x003E0028 R61 0x003D0000 R60 0x003C0008 R59 0x003B2008 R58 0x003A502C R57 0x00390000 R56 0x00380028 R55 0x0037001E R54 0x00363400 R53 0x00350069 R52 0x00345000 R51 0x003340C0 R50 0x003207C0 R49 0x00310013 R48 0x003023C7 R47 0x002F03D0 R46 0x002E0000 R45 0x002D4F80 R44 0x002C0318 R43 0x002B0051 R42 0x002A0002 R41 0x00290000 R40 0x00280000 R39 0x00270000 R38 0x00260000 R37 0x00250000 R36 0x00240000 R35 0x00230000 R34 0x00220000 R33 0x00212710 R32 0x00200000 R31 0x001F0000 R30 0x001E00F0 R29 0x001D0000 R28 0x001C0000 R27 0x001B0004 R26 0x001A0000 R25 0x00190401 R24 0x00188026 R23 0x00170000 R22 0x00160000 R21 0x00150000 R20 0x00140000 R19 0x00130000 R18 0x00120000 R17 0x001126C4 R16 0x0010921F R15 0x000FA037 R14 0x000E0000 R13 0x000D0000 R12 0x000C0000 R11 0x000B0000 R10 0x000A0000 R9 0x00090000 R8 0x00080000 R7 0x00070C0D R6 0x00060000 R5 0x00050008 R4 0x000400C0 R3 0x00030000 R2 0x00020003 R1 0x00012310 R0 0x00001010
