• LMK04821: LMK04821 Lock issue

  

  Enhui Yang

  Part Number: LMK04821 Other Parts Discussed in Thread: LMK04828 Hi team, We use LMK04821 find this device can lock when the register 0x144 is FF, but when it is 0x00 is unlock. Could you provide some suggestions? Thanks.

  • 15 days ago
  • Clock & timing
  • Clock & timing forum

• LMK04821: Output problem

  

  Vayne Li

  Part Number: LMK04821 Tool/software: Hi Teams, The input of clk0 is 15.36MHz, OSCIN is 122.88MHz, and the output clock of LVDS for all channels is 122.88m and 0.96m. However, currently only 122.88m can be measured, and 0.96m cannot be measured. Changing…

  • 1 month ago
  • Clock & timing
  • Clock & timing forum
Answered

• LMK04821: Zero Delay Mode not working

  

  Ralf Rascher

  Resolved

  Part Number: LMK04821 Hi all, I have problems with the Zero Delay Mode for an LMK04821. We use our own custom made board, set up all the registers using TICS Pro. Both PLLs lock, but when I compare the input and output frequency I can see the phase…

  • Resolved

  • 21 days ago
  • Clock & timing
  • Clock & timing forum

• LMK04821: LMK04821 out of lock

  

  Vayne Li

  TI Thinks Resolved

  Part Number: LMK04821 Tool/software: I need an external input of 10M (OSCin) and an output of 1536M clock to the ADC chip, but there is a out of lock issue. Testing has found that when an external input clock of 100M is used, LMK04821 can lock normally…

  • over 1 year ago
  • Clock & timing
  • Clock & timing forum

• LMK04821: LMK04828 phase synchronization issue between multiple boards

  

  Vayne Li

  Part Number: LMK04821 Other Parts Discussed in Thread: LMK04828 Tool/software: Hi Teams, The customer now wants to achieve phase synchronization between the output clocks of LMK04828 between multiple boards, with phase always randomly changing. They…

  • 2 months ago
  • Clock & timing
  • Clock & timing forum

• LMK04821: Writing/Reading into registers 0x106, 0x144

  

  Ralf Rascher

  Part Number: LMK04821 Other Parts Discussed in Thread: USB2ANY Tool/software: Hi, on the LMK04821 chip, when writing 0xff into the register 0x106, 0x10e, 0x11e, 0x12e and 0x136 to power down clock delay, I always read back 0x00. Writing a different…

  • 3 months ago
  • Clock & timing
  • Clock & timing forum

• LMK04821: Synchronizing SYSREF signals from LMK04821 on multiple boards

  

  user4997485

  TI Thinks Resolved

  Part Number: LMK04821 Other Parts Discussed in Thread: LMK04816 , LMK04803 , LMK04906 , LMK04208 , LMK04832 Tool/software: Hello， I have a question about synchronizing multiple boards, each with one ADC, one LMK04821, and one FPGA. Here's what I want…

  • over 1 year ago
  • Clock & timing
  • Clock & timing forum
Answered

• LMK04821: Power up sequence

  

  TISL

  Resolved

  Part Number: LMK04821 Tool/software: Dear e2e, The LMK04821 can be powered by two external LDO on Vcc1_VCO and Vcc9_CP2. In that case, is there a power up sequence to follow, between these power inputs and also vs the other rails? Regards,

  • Resolved

  • over 1 year ago
  • Clock & timing
  • Clock & timing forum

• LMK04821: Register value for OSCin_FREQ

  

  ttd

  TI Thinks Resolved

  Part Number: LMK04821 Tool/software: Dear Technical Support Team, Regarding “OSCin_FREQ” in register 0x162 of LMK04821, which of the following settings (1) or (2) is correct? (1) Set the frequency of the OSCin/OSCin* port. (2) Set the frequency…

  • over 1 year ago
  • Clock & timing
  • Clock & timing forum

• LMK04821: Power supply ripple

  

  William Wyatt-Millington

  TI Thinks Resolved

  Part Number: LMK04821 Tool/software: Is there a ripple specification for the power supplies?

  • over 1 year ago
  • Clock & timing
  • Clock & timing forum

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