Other Parts Discussed in Thread: LMX2572
Hi,
The LMX2572LP is being considered for a PLL in a communication system for ISM applications.
A recent look at the system proposed for the LMX2572LP has underlined a requirement for us to establish the maximum frequency jumps possible with the absolute maximum delay for doing this.
On page 11 of the datasheet the calibration timing specified appears to have a maximum typical value of about 60us (figure 15 in the datasheet) and about 100us from Figure 16, for the low-high and high-low jumps respectively. If these are typical values, where can I find the absolute maximum values for these parameters, across the full temperature range ?? I need to know what this timing is bounded to.
Similarly, we'd like to know what the maximum delay for completing a jump from the very lowest frequency possible to the highest possible (and vice versa whichever is longest). This may not necessarily be the lowest to highest, but simply wanting to set some upper bounds on what is a maximum delay for a jump from one frequency to another with stable frequency settling. For instance, in FHSS systems this is an important factor to know and consider and to have a known upper bound to it. Are there any graphs or maximum constraints specified in the datasheet regarding this like for the VCO calibration time ?
Thanks in advance and regards,
M