• RE: LMX2581: How to get the right frequency from the LMX2581?

  

  Mat Mazur

  Hi Noel. No, the PCB is 4 layers. With this setting(R3) you suggested and without it I have VTUNE 3.26 (almost VCC) at the input, but with other register settings it is 0.02V. The current draw in front of the ICs decreased, but I guess this is normal behavior…

  • over 2 years ago
  • Clock & timing
  • Clock & timing forum

• LMX2581: LMX2581 Terrible spurs at Fosc offset

  

  Callum Austin

  Part Number: LMX2581 Hi there, After recently creating my own board for the LMX2581, I am getting terrible spurs at Fosc offset. Using a 50MHz crystal, seeing spurs at 50, 100, 150 MHz away at -40dB down from main wanted signal. Any idea on how to suppress…

  • over 2 years ago
  • Clock & timing
  • Clock & timing forum
Answered

• LMX2581: Question About Lock Detect Output Functionality based on LD_SELECT

  

  Charles Luke

  Resolved

  Part Number: LMX2581 Reading the responses from before, I realize one question was not answered. The earlier post is marked resolved so I am asked this question again. In writing to Reg 6 with LD_SELECT = 4, table 15 shows the register map with RD_DIAGNOSTICS…

  • Resolved

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

• LMX2581: Question About Lock Detect Output Functionality based on LD_SELECT

  

  Charles Luke

  Resolved

  Part Number: LMX2581 LD_SELECT can be values from 0 to 15. For number 4, READBACK, you have to clock out the bits for the register you are reading. It appears other bits are just a single logic output such as for LD_SELECT values of 1, 2, or 3 that are…

  • Resolved

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

• RE: LMX2581: Need support on generating frequency at resolution of 1Hz

  

  Noel Fung

  You already have 1Hz resolution.

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

• LMX2581E: Differences LMX2581 vs LMX2581E

  

  DJ-NG

  Resolved

  Part Number: LMX2581E Hi champs! Customer asks for differences between both products and what are disadvantages from NON-E to E version ?

  • Resolved

  • over 2 years ago
  • Clock & timing
  • Clock & timing forum

• LMX2581: Phase Noise Performance

  

  Vigneshwar Raj

  TI Thinks Resolved

  Part Number: LMX2581 Other Parts Discussed in Thread: LMX2582 Hello TI Team, I am planning to use LMX2581 RFPLL in my new design for generating Clocks upto 3.5GHz. I saw Phase noise plots for some frequencies in Datasheet with Narrow and Wide band classifications…

  • over 2 years ago
  • Clock & timing
  • Clock & timing forum
Answered

• LMX2581: Vtune in Input after programming

  

  Tate Fisher

  Resolved

  Part Number: LMX2581 Is the Vtune pin necessary if the LMX2581 is programmed to output a specific frequency? If not, should it be tied high?

  • Resolved

  • over 2 years ago
  • Clock & timing
  • Clock & timing forum
Answered

• LMX2581: Are the registers implemented in non-volatile memory?

  

  Connor Connaughton

  Resolved

  Part Number: LMX2581 Hello, I have a question regarding the LMX2581. Reading through the datasheet, the LMX2581 has registers for programming the PLL and other settings of the IC. I just wanted to confirm, are those registers implemented in non-volatile…

  • Resolved

  • over 2 years ago
  • Clock & timing
  • Clock & timing forum
Answered

• LMX2581EVM: LMX2581 Evb Design Source

  

  Lee chris

  Resolved

  Part Number: LMX2581EVM Other Parts Discussed in Thread: LMX2581 , Request review materials for product design. LMX2581 Evb Design Source

  • Resolved

  • over 2 years ago
  • Clock & timing
  • Clock & timing forum

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