Part Number: LMK04828
Other Parts Discussed in Thread: AFE7900EVM
Tool/software:
Hello,
I have a design with the LMK04828 and I'm trying to lock PLL1 to 40MHz TCXO source that connected to CLKin0 but it seem that PLL1 is not able to lock.
I configured PLL1 LD to be "PLL1 DLD" and it blinking, on the other hand I configured PLL2 LD to be "PLL2 DLD" and it light constantly.
This is the configuration of the PLLs:
I suspected the loop filter, but I simulated it on PLLatinum, and the phase margin looks good (>40.7394°). I also tried optimizing it by replacing the resistor with a 27.4kΩ one instead of 39kΩ (the phase margin is approximately 48.8°) but it still not locked.
I'm attaching also the configuration files from the TICS:
Internal CLK5_WITHSYSREF_PLL.tcs
R0 (INIT) 0x000090 R0 0x000010 R2 0x000200 R3 0x000306 R4 0x0004D0 R5 0x00055B R6 0x000600 R12 0x000C51 R13 0x000D04 R256 0x010010 R257 0x010155 R258 0x0102AA R259 0x010300 R260 0x010422 R261 0x010500 R262 0x010630 R263 0x010711 R264 0x010818 R265 0x0109AA R266 0x010AAA R267 0x010B01 R268 0x010C22 R269 0x010D00 R270 0x010E78 R271 0x010F50 R272 0x011018 R273 0x0111AA R274 0x0112AA R275 0x011301 R276 0x011422 R277 0x011500 R278 0x011679 R279 0x011700 R280 0x011810 R281 0x0119AA R282 0x011AAA R283 0x011B00 R284 0x011C22 R285 0x011D00 R286 0x011E79 R287 0x011F11 R288 0x012006 R289 0x012155 R290 0x0122AA R291 0x012300 R292 0x012422 R293 0x012500 R294 0x012630 R295 0x012755 R296 0x01280A R297 0x0129AA R298 0x012AAA R299 0x012B00 R300 0x012C02 R301 0x012D00 R302 0x012E71 R303 0x012F01 R304 0x013010 R305 0x0131AA R306 0x0132AA R307 0x013300 R308 0x013402 R309 0x013500 R310 0x013671 R311 0x013701 R312 0x013820 R313 0x013903 R314 0x013A06 R315 0x013B00 R316 0x013C00 R317 0x013D08 R318 0x013E03 R319 0x013F00 R320 0x014001 R321 0x014100 R322 0x014200 R323 0x014311 R324 0x0144FF R325 0x01457F R326 0x014609 R327 0x01470E R328 0x014802 R329 0x014942 R330 0x014A02 R331 0x014B0E R332 0x014C00 R333 0x014D00 R334 0x014EC0 R335 0x014F7F R336 0x015001 R337 0x015102 R338 0x015200 R339 0x015300 R340 0x01547D R341 0x015500 R342 0x015678 R343 0x015700 R344 0x015896 R345 0x015901 R346 0x015A80 R347 0x015BDC R348 0x015C20 R349 0x015D00 R350 0x015E00 R351 0x015F0B R352 0x016000 R353 0x016105 R354 0x016244 R355 0x016300 R356 0x016400 R357 0x01650C R369 0x0171AA R370 0x017202 R380 0x017C15 R381 0x017D33 R358 0x016600 R359 0x016700 R360 0x01683C R361 0x016959 R362 0x016A20 R363 0x016B00 R364 0x016C00 R365 0x016D00 R366 0x016E13 R371 0x017300 R386 0x018200 R387 0x018300 R388 0x018400 R389 0x018500 R392 0x018800 R393 0x018900 R394 0x018A00 R395 0x018B00 R8189 0x1FFD00 R8190 0x1FFE00 R8191 0x1FFF53
